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Views: 428932 itfreetraining

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Views: 96277 Eddie Woo

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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

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Views: 115 KirkpatrickPrice

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RSA Public Key Encryption Algorithm (cryptography). How & why it works. Introduces Euler's Theorem, Euler's Phi function, prime factorization, modular exponentiation & time complexity. Link to factoring graph: http://www.khanacademy.org/labs/explorations/time-complexity
Views: 508556 Art of the Problem

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How do we exchange a secret key in the clear? Spoiler: We don't - Dr Mike Pound shows us exactly what happens. Mathematics bit: https://youtu.be/Yjrfm_oRO0w Computing Limit: https://youtu.be/jv2H9fp9dT8 https://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: https://bit.ly/nottscomputer Computerphile is a sister project to Brady Haran's Numberphile. More at http://www.bradyharan.com
Views: 161024 Computerphile

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Spies used to meet in the park to exchange code words, now things have moved on - Robert Miles explains the principle of Public/Private Key Cryptography note1: Yes, it should have been 'Obi Wan' not 'Obi One' :) note2: The string of 'garbage' text in the two examples should have been different to illustrate more clearly that there are two different systems in use. 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. See the full list of Brady's video projects at: http://bit.ly/bradychannels
Views: 399876 Computerphile

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Thanks to all of you who support me on Patreon. You da real mvps! \$1 per month helps!! :) https://www.patreon.com/patrickjmt !! Part 1: https://youtu.be/PkpFBK3wGJc Please consider being a supporter on Patreon! https://www.patreon.com/patrickjmt Twitter: @Patrick_JMT In this video I show mathematically for RSA encryption works by going through an example of sending an encrypted message! If you are interested in seeing how Euclid's algorithm would work, check out this video by Emily Jane: https://www.youtube.com/watch?v=fz1vxq5ts5I A big thanks to the 'Making & Science team at Google' for sponsoring this video! Please like and share using hashtag #sciencegoals
Views: 35734 patrickJMT

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The history behind public key cryptography & the Diffie-Hellman key exchange algorithm. We also have a video on RSA here: https://www.youtube.com/watch?v=wXB-V_Keiu8
Views: 594181 Art of the Problem

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The back door that may not be a back door... The suspicion about Dual_EC_DRBG - The Dual Elliptic Curve Deterministic Random Bit Generator - with Dr Mike Pound. EXTRA BITS: https://youtu.be/XEmoD06_mZ0 Nothing up my sleeve Numbers: https://youtu.be/oJWwaQm-Exs Elliptic Curves: https://youtu.be/NF1pwjL9-DE https://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: https://bit.ly/nottscomputer Computerphile is a sister project to Brady Haran's Numberphile. More at http://www.bradyharan.com
Views: 144250 Computerphile

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John Wagnon discusses the basics and benefits of Elliptic Curve Cryptography (ECC) in this episode of Lightboard Lessons. Check out this article on DevCentral that explains ECC encryption in more detail: https://devcentral.f5.com/articles/real-cryptography-has-curves-making-the-case-for-ecc-20832
Views: 139594 F5 DevCentral

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This short video introduces the concept of a lattice, why they are being considered as the basis for the next generation of public key cryptography, and a short walk through of a specific encryption algorithm. For a very thorough paper designed to be readable for undergraduates I highly recommend https://eprint.iacr.org/2015/938.pdf. *One technical note: At 1:30 I claim that lattices are composed only of integers. This is not true. Some lattices only contain integers, but in general any rational number will do.
Views: 5393 Matthew Dozer

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This is a segment of this full video: https://www.youtube.com/watch?v=YEBfamv-_do Diffie-Hellman key exchange was one of the earliest practical implementations of key exchange within the field of cryptography. It relies on the discrete logarithm problem. This test clip will be part of the final chapter of Gambling with Secrets!
Views: 437428 Art of the Problem

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This episode is brought to you by Squarespace: http://www.squarespace.com/physicsgirl With recent high-profile security decryption cases, encryption is more important than ever. Much of your browser usage and your smartphone data is encrypted. But what does that process actually entail? And when computers get smarter and faster due to advances in quantum physics, how will encryption keep up? http://physicsgirl.org/ ‪http://twitter.com/thephysicsgirl ‪http://facebook.com/thephysicsgirl ‪http://instagram.com/thephysicsgirl http://physicsgirl.org/ Help us translate our videos! http://www.youtube.com/timedtext_cs_panel?c=UC7DdEm33SyaTDtWYGO2CwdA&tab=2 Creator/Editor: Dianna Cowern Writer: Sophia Chen Animator: Kyle Norby Special thanks to Nathan Lysne Source: http://gva.noekeon.org/QCandSKD/QCand... http://physicsworld.com/cws/article/n... https://epic.org/crypto/export_contro... http://fas.org/irp/offdocs/eo_crypt_9... Music: APM and YouTube
Views: 261307 Physics Girl

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At the headquarters of Cloudflare, in San Francisco, there's a wall of lava lamps: the Entropy Wall. They're used to generate random numbers and keep a good bit of the internet secure: here's how. Thanks to the team at Cloudflare - this is not a sponsored video, they just had interesting lava lamps! There's a technical rundown of the system on their blog here: https://blog.cloudflare.com/lavarand-in-production-the-nitty-gritty-technical-details Edited by Michelle Martin, @mrsmmartin I'm at http://tomscott.com on Twitter at http://twitter.com/tomscott on Facebook at http://facebook.com/tomscott and on Snapchat and Instagram as tomscottgo
Views: 1195915 Tom Scott

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This video describes the key generation for the DSA. An example with artificially small numbers is also given
Views: 6289 Leandro Junes

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This is part 11 of the Blockchain tutorial explaining how the generate a public private key using Elliptic Curve. In this video series different topics will be explained which will help you to understand blockchain. Bitcoin released as open source software in 2009 is a cryptocurrency invented by Satoshi Nakamoto (unidentified person or group of persons). After the introduction of Bitcoin many Bitcoin alternatives were created. These alternate cryptocurrencies are called Altcoins (Litecoin, Dodgecoin etc). Bitcoin's underlying technology is called Blockchain. The Blockchain is a distributed decentralized incorruptible database (ledger) that records blocks of digital information. Each block contains a timestamp and a link to a previous block. Soon people realises that there many other use cases where the Blockchain technology can be applied and not just as a cryptocurrency application. New Blockchain platforms were created based on the Blockchain technology, one of which is called Ethereum. Ethereum focuses on running programming code, called smart contracts, on any decentralized application. Using the new Blockchain platforms, Blockchain technology can be used in supply chain management, healthcare, real estate, identity management, voting, internet of things, etcetera, just to name a few. Today there is a growing interest in Blockchain not only in the financial sector but also in other sectors. Explaining how Blockchain works is not easy and for many the Blockchain technology remains an elusive concept. This video series tries to explain Blockchain to a large audience but from the bottom up. Keywords often used in Blockchain conversation will be explained. Each Blockchain video is short and to the point. It is recommended to watch each video sequentially as I may refer to certain Blockchain topics explained earlier. Check out all my other Blockchain tutorial videos https://goo.gl/aMTFHU Subscribe to my YouTube channel https://goo.gl/61NFzK The presentation used in this video tutorial can be found at: http://www.mobilefish.com/developer/blockchain/blockchain_quickguide_tutorial.html The presentation used in this video tutorial can be found at: http://www.mobilefish.com/developer/blockchain/blockchain_quickguide_tutorial.html The python script used in the video: https://www.mobilefish.com/download/cryptocurrency/bitcoin_ec_key_generation.py.txt Cryptocurrency address generator and validator: https://www.mobilefish.com/services/cryptocurrency/cryptocurrency.html Desmos graph: https://www.desmos.com/calculator/kkj2efqk5x James D'Angelo, Bitcoin 101 Elliptic Curve Cryptography Part 4: https://youtu.be/iB3HcPgm_FI #mobilefish #blockchain #bitcoin #cryptocurrency #ethereum
Views: 14534 Mobilefish.com

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Views: 8092 Professor Messer

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This gives an overview of loading OpenSSL and generating keys used for encryption. This is the keygen.cmd file text: Echo Confirm creation of P12 key named %1 pause set OPENSSL_CONF=C:\OpenSSL-Win64\bin\openssl.cfg c: cd\OpenSSL-Win64\bin Call openssl genrsa -des3 -out %1.key 2048 Call openssl req -new -key %1.key -out %1.csr call openssl req -new -nodes -keyout %1.key -out %1.csr -newkey rsa:2048 call openssl x509 -req -days 365 -in %1.csr -signkey %1.key -out %1.crt call openssl pkcs12 -export -in %1.crt -inkey %1.key -out %1.p12 -name “%1_Key" Echo Take note of where you saved the CC1.p12 file pause
Views: 11037 Paul Danis

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Audible free book: http://www.audible.com/computerphile Hashing Algorithms are used to ensure file authenticity, but how secure are they and why do they keep changing? Tom Scott hashes it out. More from Tom Scott: http://www.youtube.com/user/enyay and https://twitter.com/tomscott http://www.facebook.com/computerphile https://twitter.com/computer_phile This video was filmed and edited by Sean Riley. Pigeon Sound Effects courtesy of http://www.freesfx.co.uk/ Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels
Views: 704322 Computerphile

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Cryptographically secure pseudorandom number generator A cryptographically secure pseudo-random number generator (CSPRNG) or cryptographic pseudo-random number generator (CPRNG) is a pseudo-random number generator (PRNG) with properties that make it suitable for use in cryptography.Many aspects of cryptography require random numbers, for example: key generation. -Video is targeted to blind users Attribution: Article text available under CC-BY-SA image source in video https://www.youtube.com/watch?v=NL-EL2KcU-Q
Views: 651 WikiAudio

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Cryptographically secure pseudorandom number generator Top # 7 Facts
Views: 69 Duryodhan Trivedi

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Views: 274 KirkpatrickPrice

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Today we're going over Elliptic Curve Cryptography, particularly as it pertains to the Diffie-Hellman protocol. The ECC Digital Signing Algorithm was also discussed in a separate video concerning Bitcoin's cryptography.
Views: 47498 CSBreakdown

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Take the Full Course of Cryptography and Network Security What we Provide 1) 20 Videos (Index is given down) + More Update will be Coming Before final exams 2)Hand made Notes with problems for your to practice 3)Strategy to Score Good Marks in Cryptography and Network Scurity To buy the course click https://goo.gl/mpbaK3 if you have any query email us at [email protected] Sample Notes : https://goo.gl/Ze1FpX or Fill the form we will contact you https://goo.gl/forms/2SO5NAhqFnjOiWvi2 Cryptography and System Security Index Lecture 1 Introduction to Cryptography and Security System Lecture 2 Security Goals and Mechanism Lecture 3 Symmetric Cipher Lecture 4 Substitution Cipher Lecture 5 Transposition Cipher Lecture 6 Stream and Block Cipher Lecture 7 Mono Alphabetic Cipher Lecture 8 Poly Alphabetic Cipher Lecture 9 Diffie Hellman Lecture 10 RSA Algorithm with Solved Example Lecture 11 IDEA Algorithm Full Working Lecture 12 SHA-1 Algorithm Full Working Lecture 13 Blowfish Algorithm Full working Lecture 14 DES Algorithm Full Working Lecture 15 Confusion and Diffusion Lecture 16 AES Algorithm Full working Lecture 17 Kerberos Lecture 18 Malicious Software ( Virus and worms ) Lecture 19 DOS and DDOS Attack Lecture 20 Digital Signature Full working Explained More videos Coming Soon.
Views: 195774 Last moment tuitions

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https://8gwifi.org/CipherFunctions.jsp Reference book: http://leanpub.com/crypto Cryptographic Algorithms generally fall into one of two different categories, or are a combination of both. Symmetric Fast Only provide confidentiality Examples: DES, AES, Blowfish, RC4, RC5 Asymmetric Large mathematical operations make it slower than symmetric algorithms No need for out of band key distribution (public keys are public!) Scales better since only a single key pair needed per individual Can provide authentication and nonrepudiation Examples: RSA, El Gamal, ECC, Diffie-Hellman problem with symmetric key cryptography DES (Data Encryption Standard) 64 bit key that is effectively 56 bits in strength Actual algorithm is called DEA (Data Encryption Algorithm) DES Modes Electronic Code Book Cipher Block Chaining (most commonly used for general purpose encryption) Cipher Feedback Output Feedback Counter Mode (used in IPSec) 3DES 112-bit effective key length Uses either 2 or 3 different smaller keys in one of several modes Modes EEE2/3 EDE2/3 AES NIST replaced DES in 1997 with this Uses the Rijndael algorithm Supports key/block sizes of 128, 192, and 256 bits Uses 10/12/14 rounds as block size increases IDEA (International Data Encryption Algorithm) Operates on 64 bit blocks in 8 rounds with 128 bit key Considered stronger than DES and is used in PGP Blowfish 64 bit block cipher with up to 448 bit key and 16 rounds Designed by Bruce Schneier RC4 Stream cipher with variable key size created by Ron Rivest RC5 Another Rivest cipher Block cipher with 32/64/128 bit blocks and keys up to 2048 bits RC6 Beefier version of RC5 submitted as AES candidate CAST 64 bit block cipher with keys between 40-128 bits with 12-16 rounds depending on key length CAST-256 used 128-bit blocks and keys from 128-256 bits using 48 rounds SAFER (Secure and Fast Encryption Routine) Set of patent-free algorithms in 64 and 128 bit block variants Variation used in Bluetooth Twofish Adapted version of Blowfish with 128 bit blocks, 128-256 bit keys and 16 rounds AES Finalist Kryptografie mit symmetrischem Schlüssel symmetric key cryptography symmetric key cryptography tutorial symmetric key cryptography example symmetric key cryptography vs asymmetric key cryptography symmetric and asymmetric key cryptography symmetric key cryptography Kryptografie mit symmetrischem Schlüssel Kryptographie mit symmetrischem Schlüssel Kryptographie mit symmetrischem Schlüssel Kryptografie mit symmetrischem Schlüssel und asymmetrische Schlüsselkryptographie symmetrische und asymmetrische Schlüsselkryptographie Kryptografie mit symmetrischem Schlüssel
Views: 38378 Zariga Tongy

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Views: 62 Rishika Janaki

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We are going to recover a ECDSA private key from bad signatures. Same issue the Playstation 3 had that allowed it to be hacked. -------------------------------------- Twitter: https://twitter.com/LiveOverflow Website: http://liveoverflow.com/ Subreddit: https://www.reddit.com/r/LiveOverflow/
Views: 23304 LiveOverflow

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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: 397008 Computerphile

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Views: 72 KirkpatrickPrice

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Views: 19795 Bitfumes Webnologies

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Digital Signature : If the Sender Private key is used at encryption then it is called digital signature. This digital Signature is implemented two approaches 1) RSA Approach 2) DSS Approach.

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This Algorithm is used to exchange the secret /symmetric key between sender and receiver. This exchange of key can be done with the help of public key and private key step 1 Assume prime number p step 2 Select a such that a is primitive root of p and a less than p step 3 Assume XA private key of user A step 4 Calculate YA public key of user A with the help of formula step 5 Assume XB private key of user B step 6 Calculate YB public key of user B with the help of formula step 7 Generate K secret Key using YB and XA with the help of formula at Sender side. step 8 Generate K secret Key using YA and XB with the help of formula at Receiver side.

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This tutorial shows you how to generate RSA Public Keys and store them in the Key Chain in Swift 4 and Xcode 9 Public Key Encryption allow you to securely encrypt communications within your iOS 11 apps and we will be showing you how to do this using the Firebase database iOS Keys are made available in the SecKey format and we will need to change these to a String format to save the public key to the Firebase database for distribution. Tutorial 2:13 In this tutorial we will be using RSA Public Key Encryption which is an asymmetric encryption type.
Views: 594 Swift Almanac

01:38:53
Secure Random By Default Dan Kaminsky Chief Scientist, White Ops As a general rule in security, we have learned that the best way to achieve security is to enable it by default. However, across operating systems and languages, random number generation is always exposed via two separate and most assuredly unequal APIs -- insecure and default, and secure but obscure. Why not fix this? Why not make JavaScript and PHP and Java and Python and even libc rand() return strong entropy? What are the issues stopping us? Should we just shell back to /dev/urandom, or is there merit to userspace entropy gathering? How does fork() and virtualization impact the question? What of performance, and memory consumption, and headless machines? Turns out the above questions are not actually rhetorical. Just because a change might be a good idea doesn't mean it's a simple one. This will be a deep dive, but one that I believe will actually yield a fix for the repeated *real world* failures of random number generation systems. Dan Kaminsky has been a noted security researcher for over a decade, and has spent his career advising Fortune 500 companies such as Cisco, Avaya, and Microsoft.Dan spent three years working with Microsoft on their Vista, Server 2008, and Windows 7 releases. Dan is best known for his work finding a critical flaw in the Internet’s Domain Name System (DNS), and for leading what became the largest synchronized fix to the Internet’s infrastructure of all time. Of the seven Recovery Key Shareholders who possess the ability to restore the DNS root keys, Dan is the American representative. Dan is presently developing systems to reduce the cost and complexity of securing critical infrastructure.
Views: 32863 DEFCONConference

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Views: 162 CHES 2015

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By the end of this lecture you will understand how PGP encryption works and how it keeps your communication over the Dark Web and Deep Web secure.

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RSA key generation, encryption and decryption with simple examples. Course material via: http://sandilands.info/sgordon/teaching
Views: 1761 Steven Gordon

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Views: 124 KirkpatrickPrice

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Views: 41529 Last moment tuitions

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Mansi Sheth, Security Researcher, Veracode Inc Are you overwhelmed by the overabundance of choices provided by the Java Cryptography API when choosing an encryption algorithm? Are you on top of all the latest happenings in cryptographic communities and know which cryptographic primitives can be broken and how? Due to time constraints, do you find yourself copy/pasting from the internet, hoping and praying that it’s secured? If any of your answers are “yes,” come to this session. It goes over all cryptographic primitive: RNGs, encryption/decryption algorithms, HMACs, and so on. The presentation points out areas that require careful attention, helps you make correct algorithmic and keying material choices, and provides plenty of code examples showing correct and incorrect usages.
Views: 1681 Java

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RSA Algorithm is the example for Public Key Encryption algorithm. Here we are supposed to find two keys 1) Public Key which is used at encryption 2) Private Key which is used at decryption step 1: Select two large Primes P , Q Step 2: Calculate n=P*Q & O(n) = (P-1)*(Q-1) Step 3: Assume e and d (Public and Private Key). Step 4: Encrypt the Plain Text using Public Key e. Step 5: Decrypt the Cipher Text using Private Key d.

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Video 16 - "Cryptography Algorithms and Protocols" - This second nugget of the Cryptography domain lays out hashing concepts and algorithms like MD5 and SHA. Basic algorithms and encryption concepts are explored including: DES, 3DES, RSA, PGP, Elliptic curve (ECC), AES/AES256, One time pad, SSL/TLS, S/MIME, and PPTP/L2TP.
Views: 12354 SwampTarts

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Cryptography Basics for Embedded Developers - Eystein Stenberg, Mender Many vulnerabilities and breaches happen due to incorrect use of cryptographic mechanisms like encryption. This talk will cover the basic mechanisms of cryptography, like encryption, signatures, and key storage, looking at how these are used to create important security properties like authentication, confidentiality and integrity. Performance is particularly important for embedded development and we will cover which cryptographic operations are computationally expensive and why. We will highlight implementations of cryptographic mechanisms that help meet the performance needs of embedded devices, including Elliptic Curve Cryptography. We will wrap up with common pitfalls, libraries and tools relevant for secure use of cryptography for embedded devices. Eystein Stenberg has over 7 years of experience in security and systems management as a developer, a support engineer, a technical account manager, and now as a product manager. He has been in the front line of some of the largest production environments in various roles and has in-depth knowledge of the challenges in systems security in a real-world context. His holds a Master’s degree in cryptography and his writing credits include “Distributing a Private Key Generator in Ad Hoc Networks."

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Patrick Townsend, Founder & CEO of Townsend Security, discusses encryption keys and how they are used, what key management systems are and how they are used, how key management systems are deployed, and the basic components of a key management system.
Views: 19048 Townsend Security

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This video is part of an online course, Applied Cryptography. Check out the course here: https://www.udacity.com/course/cs387.
Views: 1302 Udacity

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http://wealthbuildingideas.com - This video shows you, step by step, how I create random, SECURE, registration key codes for all my software and web based applications. Generating your codes this way also heightens the secure-ness of your registration codes...
Views: 675 WealthBuildingIdeas

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MIT 6.046J Design and Analysis of Algorithms, Spring 2015 View the complete course: http://ocw.mit.edu/6-046JS15 Instructor: Srinivas Devadas In this lecture, Professor Devadas continues with cryptography, introducing encryption methods. License: Creative Commons BY-NC-SA More information at http://ocw.mit.edu/terms More courses at http://ocw.mit.edu
Views: 15016 MIT OpenCourseWare

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Asymmetrical cryptography uses the same pair of keys for encryption and decryption. Differing from symmetric key algorithms, asymmetrical cryptography requires the use of public keys and private keys. A set or pair of keys consists of a public key and a private key. Messages encrypted using the public key can only be decrypted by the paired private key. Asymmetrical cryptography is more secure than symmetric key algorithms. In symmetric key algorithms, both parties share the same secret key. If one party’s secret key is exposed, it would compromise the encryption. Asymmetrical cryptography uses a pair of keys, one for encryption and one for decryption. The public key is widely accessible while the private key is known only to the owner. There is no need to exchange private keys prior to transacting, therefore preventing data theft by hackers. Huobi Global Exchange: https://www.huobi.com Follow us on: Blog: https://blog.huobi.com/ Facebook: https://www.facebook.com/huobiglobalofficial Instagram: https://www.instagram.com/huobiglobalofficial Medium: https://medium.com/@huobiglobal Telegram: https://t.me/huobiglobalofficial Twitter: https://twitter.com/HuobiGlobal Youtube: https://www.youtube.com/HuobiGlobal
Views: 203 Huobi Global