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Symmetric Key and Public Key Encryption
 
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Modern day encryption is performed in two different ways. Check out http://YouTube.com/ITFreeTraining or http://itfreetraining.com for more of our always free training videos. Using the same key or using a pair of keys called the public and private keys. This video looks at how these systems work and how they can be used together to perform encryption. Download the PDF handout http://itfreetraining.com/Handouts/Ce... Encryption Types Encryption is the process of scrambling data so it cannot be read without a decryption key. Encryption prevents data being read by a 3rd party if it is intercepted by a 3rd party. The two encryption methods that are used today are symmetric and public key encryption. Symmetric Key Symmetric key encryption uses the same key to encrypt data as decrypt data. This is generally quite fast when compared with public key encryption. In order to protect the data, the key needs to be secured. If a 3rd party was able to gain access to the key, they could decrypt any data that was encrypt with that data. For this reason, a secure channel is required to transfer the key if you need to transfer data between two points. For example, if you encrypted data on a CD and mail it to another party, the key must also be transferred to the second party so that they can decrypt the data. This is often done using e-mail or the telephone. In a lot of cases, sending the data using one method and the key using another method is enough to protect the data as an attacker would need to get both in order to decrypt the data. Public Key Encryption This method of encryption uses two keys. One key is used to encrypt data and the other key is used to decrypt data. The advantage of this is that the public key can be downloaded by anyone. Anyone with the public key can encrypt data that can only be decrypted using a private key. This means the public key does not need to be secured. The private key does need to be keep in a safe place. The advantage of using such a system is the private key is not required by the other party to perform encryption. Since the private key does not need to be transferred to the second party there is no risk of the private key being intercepted by a 3rd party. Public Key encryption is slower when compared with symmetric key so it is not always suitable for every application. The math used is complex but to put it simply it uses the modulus or remainder operator. For example, if you wanted to solve X mod 5 = 2, the possible solutions would be 2, 7, 12 and so on. The private key provides additional information which allows the problem to be solved easily. The math is more complex and uses much larger numbers than this but basically public and private key encryption rely on the modulus operator to work. Combing The Two There are two reasons you want to combine the two. The first is that often communication will be broken into two steps. Key exchange and data exchange. For key exchange, to protect the key used in data exchange it is often encrypted using public key encryption. Although slower than symmetric key encryption, this method ensures the key cannot accessed by a 3rd party while being transferred. Since the key has been transferred using a secure channel, a symmetric key can be used for data exchange. In some cases, data exchange may be done using public key encryption. If this is the case, often the data exchange will be done using a small key size to reduce the processing time. The second reason that both may be used is when a symmetric key is used and the key needs to be provided to multiple users. For example, if you are using encryption file system (EFS) this allows multiple users to access the same file, which includes recovery users. In order to make this possible, multiple copies of the same key are stored in the file and protected from being read by encrypting it with the public key of each user that requires access. References "Public-key cryptography" http://en.wikipedia.org/wiki/Public-k... "Encryption" http://en.wikipedia.org/wiki/Encryption
Views: 428318 itfreetraining
Asymmetric encryption - Simply explained
 
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How does public-key cryptography work? What is a private key and a public key? Why is asymmetric encryption different from symmetric encryption? I'll explain all of these in plain English! 🐦 Follow me on Twitter: https://twitter.com/savjee ✏️ Check out my blog: https://www.savjee.be 👍🏻 Like my Facebook page: https://www.facebook.com/savjee
What is Encryption? Public Key Encryption? Explained in Detail
 
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Namaskaar Dosto, is video mein maine aapko encryption ke baare mein bataya hai, aap sabhi ne computer aur internet use karte time Encryption aur decryption ke baare mein jarur suna hoga, usme aapko SSL encrytpion TSL Encryption, Public Key encryption, private key encryption wagereh ke baare mein bhi suna hoga, aur abhi recently whatsapp ne bhi end to end encryption launch kiya hai, toh aise mein hamare man mein bahut se sawaal hai ki aakhir yeh encryption hota kya hai? Encryption hum hamari email pe bhi use karte hai, aur hum online banking karte time bhi encryption ka use karte hai. Mujhe umeed hai ki yeh video dekhne ke baad aap encryption aur decryption ke baare mein sab kuch jaan jayenge, aur saath hi saath public key encryption ke baare mein bhi samajh jayenge. aur aap aaraam se whatsapp ke encryption feature ko bhi use kar payenge. Win Galaxy S7, S7 Edge Here: http://bit.ly/TheMegaGiveaway Share, Support, Subscribe!!! Subscribe: http://bit.ly/1Wfsvt4 Youtube: http://www.youtube.com/c/TechnicalGuruji Twitter: http://www.twitter.com/technicalguruji Facebook: http://www.facebook.com/technicalguruji Instagram: http://instagram.com/technicalguruji Google Plus: https://plus.google.com/+TechnicalGuruji About : Technical Guruji is a YouTube Channel, where you will find technological videos in Hindi, New Video is Posted Everyday :)
Views: 162505 Technical Guruji
Cryptography: Crash Course Computer Science #33
 
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Today we’re going to talk about how to keep information secret, and this isn’t a new goal. From as early as Julius Caesar’s Caesar cipher to Mary, Queen of Scots, encrypted messages to kill Queen Elizabeth in 1587, theres has long been a need to encrypt and decrypt private correspondence. This proved especially critical during World War II as Allan Turing and his team at Bletchley Park attempted to decrypt messages from Nazi Enigma machines, and this need has only grown as more and more information sensitive tasks are completed on our computers. So today, we’re going to walk you through some common encryption techniques such as the Advanced Encryption Standard (AES), Diffie-Hellman Key Exchange, and RSA which are employed to keep your information safe, private, and secure. Note: In October of 2017, researchers released a viable hack against WPA2, known as KRACK Attack, which uses AES to ensure secure communication between computers and network routers. The problem isn't with AES, which is provably secure, but with the communication protocol between router and computer. In order to set up secure communication, the computer and router have to agree through what's called a "handshake". If this handshake is interrupted in just the right way, an attacker can cause the handshake to fault to an insecure state and reveal critical information which makes the connection insecure. As is often the case with these situations, the problem is with an implementation, not the secure algorithm itself. Our friends over at Computerphile have a great video on the topic: https://www.youtube.com/watch?v=mYtvjijATa4 Produced in collaboration with PBS Digital Studios: http://youtube.com/pbsdigitalstudios Want to know more about Carrie Anne? https://about.me/carrieannephilbin The Latest from PBS Digital Studios: https://www.youtube.com/playlist?list=PL1mtdjDVOoOqJzeaJAV15Tq0tZ1vKj7ZV Want to find Crash Course elsewhere on the internet? Facebook - https://www.facebook.com/YouTubeCrash... Twitter - http://www.twitter.com/TheCrashCourse Tumblr - http://thecrashcourse.tumblr.com Support Crash Course on Patreon: http://patreon.com/crashcourse CC Kids: http://www.youtube.com/crashcoursekids
Views: 168318 CrashCourse
Symmetric vs. Asymmetric Encryption - CompTIA Security+ SY0-401: 6.1
 
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Security+ Training Course Index: http://professormesser.link/sy0401 Professor Messer’s Course Notes: http://professormesser.link/sy0401cn Frequently Asked Questions: http://professormesser.link/faq - - - - - Our encryption methods will generally use either symmetric encryption or asymmetric encryption, and sometimes both! In this video, you’ll learn the advantages and disadvantages when using symmetric or asymmetric encryption types. - - - - - Download entire video course: http://professormesser.link/401adyt Get the course on MP3 audio: http://professormesser.link/401vdyt Subscribe to get the latest videos: http://professormesser.link/yt Calendar of live events: http://www.professormesser.com/calendar/ FOLLOW PROFESSOR MESSER: Professor Messer official website: http://www.professormesser.com/ Twitter: http://www.professormesser.com/twitter Facebook: http://www.professormesser.com/facebook Instagram: http://www.professormesser.com/instagram Google +: http://www.professormesser.com/googleplus
Views: 61101 Professor Messer
Advanced Encryption Standard (AES): Sub Stages; Finite Field Arithmetic
 
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AES Steps: Substitute Bytes, Shift Rows, Mix Columns, GF Arithmetic
Views: 9629 Natarajan Meghanathan
President Obama on Encryption
 
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President Barack Obama discusses the recent strains over over encryption in
Views: 4878 Recode
DES Decryption
 
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This DEMO is fully describe Decryption process Note:we use only -two key- and the “Standard DES” uses 16 keys.
Views: 558 Elaf Abdulrazzak
A Look Into Elliptic Curve Cryptography (ECC)
 
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A talk about the basics of Elliptic Curve Cryptography (ECC), its use and application today, strengths and weaknesses.
Views: 21477 mrdoctorprofessorsir
Triple DES
 
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This video is part of the Udacity course "Intro to Information Security". Watch the full course at https://www.udacity.com/course/ud459
Views: 21857 Udacity
What is Cryptography? - Encryption and Decryption
 
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Understand the basics of cryptography and the concept of symmetric or private key and asymmetric or public key cryptography. Also, a simple example of how cryptography is applied in web browsers. Link to "Applications of Public Key Cryptography" video: https://www.youtube.com/watch?v=Uk1mjEpW33s
Views: 5756 Biz Sci Tech
Encryption: ECB v CBC
 
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http://asecuritysite.com/subjects/chapter58 I forgot to add the key to each of the stages of CBC.
Views: 14453 Bill Buchanan OBE
Security Snippet: Triple DES
 
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The tutorial is at: http://www.asecuritysite.com/Encryption/threedes
Views: 3200 Bill Buchanan OBE
What Is Digital Signature In Cryptography?
 
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In the united states and certain other countries. Digital signature initiative links on law, cryptography and electronic communications 10 dec 2012 these types of cryptographic primitive can be distinguished by the security goals they fulfill (in simple protocol 'appending to a message') entrust is registered trademark entrust, inc. Bitcoin digital signatures (video) microsoft docs. Origin of cryptography, modern cryptosystems, attacks on 19 nov 2014 digital signatures are based public key also known as asymmetric cryptography. Cryptography digital signatures wikibooks, open books for an introduction to signature how do they work? Cgi. How do digital signatures work? Youtube. What is digital signature? Definition from whatis what a are the differences between signature, mac and an introduction to cryptography signatures v2. Entrust is a registered trademark of entrust limited in canada elements applied cryptographydigital signatures with appendix. Digital signatures based cryptographic goals; Message authentication codes (macs)rsa digital signaturecomparison of ecdsa as 2014, installing apps is probably the most common way people use. Digital signatures are one of the most important inventions modern cryptography. Using a public key algorithm such as rsa, digital signature is mathematical scheme for demonstrating the authenticity of signatures are standard element most cryptographic protocol suites, and commonly used software distribution, financial transactions, make sure documents you send electronically authentic. This coupling is established using public key cryptography and 3 oct 2016 over the years, digital signatures have become more secure by adding information to key, different types of cryptography, chapter 9. The problem is how can a user sign What digital signature? Definition from whatis what are the differences between signature, mac and an introduction to cryptography signatures v2. Keys are used to encrypt information. Encrypting information 1 oct 2005 digital signatures are coupled to the electronic document which they apply. Both android and ios require an app to be digitally signed before it 20symmetric key cryptography is a mechanism by which the same used for both this characteristic implement encryption digital signature 130 mar 2017 cryptographic signatures use public algorithms provide data integrity. What is a digital signature? . Chapter 09 digital signatures fi muni. Digital signatures with message recovery. Understanding digital certificates technet microsoft. Learn about digital signatures and other authentication methods. Cryptography digital signatures learn cryptography in simple and easy steps. Crash c
Views: 19 Hadassah Hartman
Cryptography Best Practices - Bart Preneel
 
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Application architects need to make informed choices to use cryptography well: + Alternative key architectures have their merits and drawbacks. PKIs, in particular, should be contrasted with symmetric key architectures such as Kerberos. + Network protocol characteristics are pivotal in ensuring distributed applications meet security requirements. Key strength choices impact on security guarantees offered, as do cryptographic algorithm modes. + While strong keys and wise use of cryptographic algorithms may thwart cryptanalytic attack, applications are insecure without prudent key management. In this context, key generation and key storage require particular attention. + The selection of crypto-libraries requires awareness of inherent library qualities and failures. Application developers are advised not to implement their own. Learning objectives + decide if and when cryptography should be used. + make informed key architecture and management decisions. + use appropriate algorithms and parameters. + select an appropriate cryptographic library. + choose network protocols for distributed applications. This lecture was delivered by Bart Preneel at SecAppDev 2013 in Leuven, Belgium. Professor Bart Preneel of KU Leuven heads the COSIC (COmputer Security and Industrial Cryptography) research group. His main research area is information security with a focus on cryptographic algorithms and protocols as well as their applications to both computer and network security, and mobile communications. He teaches cryptology, network security and coding theory at the KU Leuven and was visiting professor at the Ruhr Universitaet Bochum (Germany), the T.U.Graz (Austria), the University of Bergen (Norway), and the Universiteit Gent (Belgium). In '93-'94 he was a research fellow at the University of California at Berkeley. He has taught intensive courses around the world. He undertakes industrial consulting (Mastercard International, S.W.I.F.T., Proton World International,...), and participates in the work of ISO/IEC JTC1/SC27/WG2. Professor Preneel is Vice President of the International Association for Cryptologic Research (IACR) and co-founder and chairman of LSEC vzw (Leuven Security Excellence Consortium).
Views: 2835 secappdev.org
The one-time pad | Journey into cryptography | Computer Science | Khan Academy
 
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The perfect cipher Watch the next lesson: https://www.khanacademy.org/computing/computer-science/cryptography/crypt/v/frequency-stability?utm_source=YT&utm_medium=Desc&utm_campaign=computerscience Missed the previous lesson? https://www.khanacademy.org/computing/computer-science/cryptography/crypt/v/polyalphabetic-cipher?utm_source=YT&utm_medium=Desc&utm_campaign=computerscience Computer Science on Khan Academy: Learn select topics from computer science - algorithms (how we solve common problems in computer science and measure the efficiency of our solutions), cryptography (how we protect secret information), and information theory (how we encode and compress information). About Khan Academy: Khan Academy is a nonprofit with a mission to provide a free, world-class education for anyone, anywhere. We believe learners of all ages should have unlimited access to free educational content they can master at their own pace. We use intelligent software, deep data analytics and intuitive user interfaces to help students and teachers around the world. Our resources cover preschool through early college education, including math, biology, chemistry, physics, economics, finance, history, grammar and more. We offer free personalized SAT test prep in partnership with the test developer, the College Board. Khan Academy has been translated into dozens of languages, and 100 million people use our platform worldwide every year. For more information, visit www.khanacademy.org, join us on Facebook or follow us on Twitter at @khanacademy. And remember, you can learn anything. For free. For everyone. Forever. #YouCanLearnAnything Subscribe to Khan Academy’s Computer Science channel: https://www.youtube.com/channel/UC8uHgAVBOy5h1fDsjQghWCw?sub_confirmation=1 Subscribe to Khan Academy: https://www.youtube.com/subscription_center?add_user=khanacademy
Views: 415087 Khan Academy
S-DES Cipher (Key Generation)
 
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Part 1
Views: 230 Mohammad Younis
Firewall Introduction Architecture, Characteristics of Good Firewall, Limitations of Firewall
 
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Firewall Introduction - Architecture, Characteristics of Good Firewall, Limitations of Firewall Keywords: Firewall Limitations of Firewall Firewall Characteristics Firewall Architecture Network Security Notes
Hak5 - Encryption 101, Hak5 1115
 
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Encryption 101 begins with understanding the terminology and mechanisms. This week we're breaking down encryption in the context of SSH - from symmetric and asymmetric to block and stream ciphers. All that and more, this time on Hak5. If you're into Hak5 you'll love our new show by hosts Darren Kitchen and Shannon Morse. Check out http://www.revision3.com/haktip Whether you're a beginner or a pro, http://www.revision3.com/haktip is essential viewing for current and aspiring hackers, computer enthusiasts, and IT professionals. With a how-to approach to all things Information Technology, HakTip breaks down the core concepts, tools, and techniques of Linux, Wireless Networks, Systems Administration, and more. And let's not forget to mention that you can follow us on http://www.twitter.com/hak5 and http://www.facebook.com/technolust, http://revision3.com/hak5/follow to the show and get all your Hak5 goodies, including the infamous wifi-pineapple over at http://hakshop.com . If you have any questions or suggestions please feel free to contact us at [email protected]
Views: 18278 Hak5
Python Encryption Tutorial with PyCrypto
 
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Sentdex.com Facebook.com/sentdex Twitter.com/sentdex How to use python to encrypt sensitive information, and later decrypt it, using PyCrypto! PyCrypto: https://www.dlitz.net/software/pycrypto/ The Code: http://sentdex.com/sentiment-analysisbig-data-and-python-tutorials/encryption-and-decryption-in-python-code-example-with-explanation/
Views: 77421 sentdex
Virus, Worms and Trojan Horses Brief Introduction and Difference between their Functionality
 
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Virus, Worms and Trojan Horses Brief Introduction and Difference between their Functionality Keywords: Virus Worms Trojan Horses Network Security Notes
S Box Design
 
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S-boxes, the only nonlinear part of a substitution-permutation network as a cryptosystem. Without them, intruders would compromise a system easily.
Views: 11896 Lorenia Misiaszek
Encryption Part I: Introduction to Encryption 3
 
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The third video in the series, looking at how to implement various forms of secure encryption. Software mentioned in the video: OpenPGP http://openpgp.org/ MIT's PGP public key server http://pgp.mit.edu/ Threema https://threema.ch Carbonite http://www.carbonite.com/ 7-Zip http://www.7-zip.org/ NOTE: This channel has no association with any of these websites and none are paid product placements.
Views: 24159 Shane Killian
DES Encryption Example Explained part 1(DES)
 
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DES Encryption Example Explained is a video explains complete DES encryption with an example ,DES Encryption Example Explained explains the DES using the animation,Here the example shows the step by step procedure to encrypt the message using DES.
Views: 1554 Mohanesh bm
SHA: Secure Hashing Algorithm - Computerphile
 
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Secure Hashing Algorithm (SHA1) explained. Dr Mike Pound explains how files are used to generate seemingly random hash strings. EXTRA BITS: https://youtu.be/f8ZP_1K2Y-U Tom Scott on Hash Algorithms: https://youtu.be/b4b8ktEV4Bg http://www.facebook.com/computerphile https://twitter.com/computer_phile This video was filmed and edited by Sean Riley. Computer Science at the University of Nottingham: http://bit.ly/nottscomputer Computerphile is a sister project to Brady Haran's Numberphile. More at http://www.bradyharan.com
Views: 395762 Computerphile
what is encryption and decryption ? about cryptography | TECH SETTAI TAMIL
 
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what is encryption and decryption ? about cryptography | TECH SETTAI TAMIL its about the type of attack in cryptography, use of encryption and decryption. why encryption are used where encryption are used types of attack in cryptography and more SUBSCRIBE US BY CLICKING RED SUBSCRIBE BUTTON, SUPPORT US ON FB, TWITTER AND ALSO G+ twitter: https://twitter.com/TechSettai fb:https://www.facebook.com/techsettai/ g+ :https://plus.google.com/u/1/117864875... -~-~~-~~~-~~-~- Please watch: "how to install app not available in INDIA | TECH SETTAI TAMIL" https://www.youtube.com/watch?v=wF5JAhDvPQM -~-~~-~~~-~~-~-
Symmetric Key Encryption and Data Authentication
 
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Dig a little deeper into symmetric key encryption to find out about one of the basic methods of encrypting data and a simple algorithm for checking that the data is authentic.
Views: 482 Vidder, Inc.
Triple DES
 
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Cyber Attack Countermeasures Module 3 Introducing Conventional Cryptography This module introduces the foundations of conventional cryptography along with its practical application in Kerberos. Learning Objectives • Recall the S/KEY protocol and its cryptanalytic properties • Summarize the basic architecture of Kerberos • Identify the detailed steps of Kerberos including key distribution • Describe conventional cryptography • Describe DES and its basic properties • Examine how triple-DES maintains compatibility with DES through key management Subscribe at: https://www.coursera.org/learn/intro-cyber-attacks/home/welcome https://www.coursera.org
Views: 470 intrigano
Simplified DES Example (CSS322, Lecture 5, 2013)
 
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Example of key generation and encryption using simplified DES. Lecture 5 of CSS322 Security and Cryptography at Sirindhorn International Institute of Technology, Thammasat University. Given on 26 November 2013 at Bangkadi, Pathumthani, Thailand by Steven Gordon. Course material via: http://sandilands.info/sgordon/teaching
Views: 40495 Steven Gordon
Cryptography Android App
 
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✴ Cryptography is about constructing and analyzing protocols that prevent third parties or the public from reading private messages; various aspects in information security such as data confidentiality, data integrity, authentication, and non-repudiation are central to modern cryptography. Modern cryptography exists at the intersection of the disciplines of mathematics, computer science, electrical engineering, communication science, and physics. Applications of cryptography include electronic commerce, chip-based payment cards, digital currencies, computer passwords, and military communications.✴ https://play.google.com/store/apps/details?id=in.softecks.cryptography ► This App is meant for students of computer science who aspire to learn the basics of cryptography. It will be useful for networking professionals as well who would like to incorporate various cryptographic algorithms to ensure secure data communication over their networks.✦ 【Topics Covered in this App are Listed Below】 ⇢ Origin of Cryptography ⇢ Modern Cryptography ⇢ Cryptosystems ⇢ Attacks On Cryptosystems ⇢ Traditional Ciphers ⇢ Modern Symmetric Key Encryption ⇢ Block Cipher ⇢ Feistel Block Cipher ⇢ Data Encryption Standard ⇢ Triple DES ⇢ Advanced Encryption Standard ⇢ Block Cipher Modes of Operation ⇢ Public Key Encryption ⇢ Data Integrity in Cryptography ⇢ Cryptography Hash functions ⇢ Message Authentication ⇢ Cryptography Digital signatures ⇢ Public Key Infrastructure ⇢ Cryptography Benefits & Drawbacks
Views: 102 10 Up's.!
Martijn Grooten - Elliptic Curve Cryptography for those who are afraid of maths
 
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Elliptic Curve Cryptography (ECC) is hot. Far better scalable than traditional encryption, more and more data and networks are being protected using ECC. Not many people know the gory details of ECC though, which given its increasing prevalence is a very bad thing. In this presentation I will turn all members of the audience into ECC experts who will be able to implement the relevant algorithms and also audit existing implementations to find weaknesses or backdoors. Actually, I won't. To fully understand ECC to a point where you could use it in practice, you would need to spend years inside university lecture rooms to study number theory, geometry and software engineering. And then you can probably still be fooled by a backdoored implementation. What I will do, however, is explain the basics of ECC. I'll skip over the gory maths (it will help if you can add up, but that's about the extent of it) and explain how this funny thing referred to as "point addition on curves" can be used to exchange a secret code between two entities over a public connection. I will also explain how the infamous backdoor in Dual_EC_DRGB (a random number generator that uses the same kind of maths) worked. At the end of the presentation, you'll still not be able to find such backdoors yourselves and you probably realise you never will. But you will be able to understand articles about ECC a little better. And, hopefully, you will be convinced it is important that we educate more people to become ECC-experts.
Views: 19658 Security BSides London
SSL TLS HTTPS process explained in 7 minutes
 
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SSL TLS HTTPS process explained in 7 minutes
Views: 324089 Johannes Bickel
DES Encryption Using Python 3 - Cryptography with Python
 
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This tutorial explains how to encrypt text using DES in Python 3.
Views: 241 ma academy
Transmition Encrypt and Decrypt Code in Arduino
 
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Transmition Encrypt and Decrypt Code in Arduino Code and Simulation Transmitter encrypt Code Send to Receiver. Receiver decrypt Code after receive from Transmitter. Instructor: Chan Tola Upload by Tann Thona
Views: 1061 Thona Tann
AskDeveloper Podcast - 46 - Cryptography - Part 1 - Introduction and Hashing - التشفير الجزء الأول
 
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http://www.askdeveloper.com/2017/01/cryptography.html Information Security 1. Introduction ○ Security by obscurity § Steganography □ Hiding data inside another form of data, like using non-used bits in image to hide a message § Cool, but not practical. § Disadvantages ◊ Algorithm secrecy vs. key secrecy ○ Cryptography is everywhere and yet if done right, you can barely see it. ○ Goals: § Confidentiality □ Secrets stay secret. § Integrity □ Data is not tampered with. § Non-Repudiation □ No party can deny sending messages. § Authentication □ Each party can ensure that the sender is what they expect. ○ Cryptography § Hashing § Encryption § Signing § Protocols ○ Random Number Generators § Extremely important, almost all encryption/hashing strength is affected by how random the random number generator is. § Don't use simple random number, use a cryptographic random number generator with a sophisticated source of entropy. § Pseudorandom number generator § Dual_EC_DRBG random generator backdoor 2. Body ○ Hashing (one Way) § Properties □ Fixed length output no matter what size the input was □ Very easy to compute the hash of a given message, however very hard to compute from a hash the corresponding input. □ Mathematically infeasible to generate a message that has a given hash □ Any modification to a message produces a completely different hash that has no relationship to the original message's hash. □ It is mathematically infeasible to find two messages with the same hash. Hash Collision § Hashing Functions □ Provides data integrity, however lacks authentication □ Examples ® MD5 ◊ Considered Insecure ® Secure Hash Family SHA-X, Sha-1, Sha-2 [Sha256, Sha512], Sha-3 ◊ Sha-1 is considered insecure. ◊ Sha-1, Sha-2 designed by NSA ◊ Sha-3 is not designed by NSA, Competition winner. □ Attacks ® Brute force ◊ CPU's are getting faster and cheaper every day. ◊ GPU's are getting faster and cheaper every day. ◊ Special Hash calculating hardware is becoming more available especially with the BitCoin push. ® Rainbow table attacks ◊ Pre-Calculated tables where you can reverse lookup a hash to a value ◊ Try www.crackstation.net § Hash Message Authentication Codes (HMAC) □ Adds authentication to integrity □ Can be used with all previous algorithms, HMACMD5, HMACShA1, HMAC256 … etc. § Salted Hash □ Adds random salt to mitigate rainbow table □ Salts are unique per record, and not a secret. § Password Based Key Derivation Function (PBKDF2) □ RSA Public Key Cryptographic Standard PKCS #5 Version 2.0 □ Internet Engineering Task Force RFC 2898 Specification ® Adds a lot of iterations to slow it just enough to mitigate brute force (default 50,000 iterations) ® Adds random salt to mitigate rainbow table □ Disadvantage: It can be easily implemented with hardware which makes it vulnerable to bruteforce even with high number of iterations § Bcrypt □ Password Hashing function □ State of the art password hashing § Usages □ Integrity Check Password Storage Our facebook Page http://facebook.com/askdeveloper On Sound Cloud http://soundcloud.com/askdeveloper Please Like & Subscribe
Views: 2039 Mohamed Elsherif
Block Cipher Standards (AES)
 
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Cryptography and Network Security by Prof. D. Mukhopadhyay, Department of Computer Science and Engineering, IIT Kharagpur. For more details on NPTEL visit http://nptel.iitm.ac.in
Views: 18289 nptelhrd
DES Substitution Boxes
 
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CSCI 361 Assignment 2 DES Video Topic: Substitution Boxes (S-Box) Video generated by Microsoft Powerpoint
Views: 5105 Jax Lee
DES Encryption Example Explained part2
 
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DES Encryption Example Explained is a video explains complete DES encryption with an example ,DES Encryption Example Explained explains the DES using the animation,Here the example shows the step by step procedure to encrypt the message using DES.
Views: 600 Mohanesh bm
WEP Encryption Isn't Secure
 
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Our video shows hackers can crack WEP passwords in just minutes using readily available tools. Check out www.sophos.com/warbiking to see the results of our search for unsecured wireless networks and how to stay protected.
Views: 1469 Sophos
Polygraphic Part 2 - Hill Ciphers Examples/Encryption/Decryption
 
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A beginner's guide to Polygraphic Ciphers, Part 2. (Hill Ciphers Examples/Encryption/Decryption)
Views: 98413 Daniel Rees
322 Double DES
 
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Views: 768 Rezky Wulandari
DES Encryption Decryption for Data Text Pictures images with Matlab code
 
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DES (Data Encryption Standard) DES Encryption decryption algorithm DATA= Text (ASCII or pictures) program language: Matlab coded by: th3 Mockingjay Hack3r Fb: Mocking jay [email protected] Code below . . . . . . . .
Views: 776 Matlab Tuto
solving an otp
 
10:55
we are having 4 ciphertexts encrypted using 3 keys, we will analyse them, and will finally find the answer using crib dragging (basically solving many time pad) C1 - 3ad99001d39b93192981b7d7a79946d6eddf79955719a625c6cac10ec2a1d6535ee0 C2 - 58bcfb3579e7dcd7842682b7405b6bdbdf354e973ac3b45384b1894a5353faeb8400 C3 - f4887ef3b88e89a2c2b76d7321ce43282206ab4d5cdc4f77d98037346e0558e11e39 C4 - 44fdf52430ce9f93c968b1ff72472ed1972754d636d4b7068de9a96b1c48f6bd885d
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