Symmetric Key Cryptography - Cipher
Watch more Videos at https://www.tutorialspoint.com/videotutorials/index.htm
Lecture By: Mr. Arnab Chakraborty, Tutorials Point India Private Limited

Views: 2596
Tutorials Point (India) Pvt. Ltd.

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: 497565
itfreetraining

Symmetric and Asymmetric Key Cryptography
Watch more Videos at https://www.tutorialspoint.com/videotutorials/index.htm
Lecture By: Mr. Arnab Chakraborty, Tutorials Point India Private Limited

Views: 6723
Tutorials Point (India) Pvt. Ltd.

Get Full Course: http://www.engineeringmentor.com/CNYTv3
Networks #3: This tutorial introduces the Cryptography basics. It also explains what is Encryption and Decryption.
a) Cryptography basics (00:21):http://youtu.be/BEb_AnPWPwY?t=21s
how do we provide this security during transmission? Well, One way of ensuring security can be use of CRYPTOGRAPHY!
Cryptography is a field of network security
which deals with hiding "real" infromation
when it is under transmission between the two parties.
Usually, the real information is transformed
or hidden into another message and transmitted over the network.
This transformed message in itself will make no sense
even if any hacker gets hold of this information.
When it reaches the destination,
the receipent will know a method to de-transform
the garbage message into the original information
which the sender had sent.method of transforming message at sender's side
and de transforming at reciever's side forms the basic model of Cryptography.
b) Encryption and Decryption (3:57):http://youtu.be/BEb_AnPWPwY?t=3m57s
First, the information to be transmitted, called as plain text(or message)
is fed to an Encryption system.
The Encyrption system uses a key to convert the plain text to encyrpted form
which looks like garbage value.
This is also called as cipher text.
A corresponding key is used at the other end
to decrypt the cipher text back to original message.
When we say a key, it actually means a piece of string value
which is fed to encyprtion and decryption algorithms
along with the text for transformation.
When the message reaches the destination,
this system at the other end decrypts the cipher text into original message
with the help of the key.
This is called as Decryption System.
The output of the Decryption System is the intended message.
Depending on how the keys are shared,
we can classify crytography as symmetric and asymmetric.
If the keys used by both parties are same,
then it is called symmetric key cryptography, or private key cryptography.
If both parties use different keys for encyrption and decryption,
then it is called asymmetric key cryptography or public key cryptography.
video URL : https://www.youtube.com/watch?v=BEb_AnPWPwY
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Views: 108746
Skill Gurukul

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: 17977
MIT OpenCourseWare

Symmetric Encryption
Section 2 continues its focus on Cryptographic tools with an in-depth introduction and analysis of Symmetric Encryption.
The Symmetric Encryption discussion opens by reviewing the usage of random numbers, explaining what Replay Attack is, the importance of unique information on data packets and in sequencing and defining key terms including Nonce and Key Generation.
Then, you’re introduced to Symmetric Encryption with a basic summary of how it works, what ciphers are, the different types of Symmetric Ciphers, what happens with block ciphers, and what the difference means to encryption and decryption as a process.
As a penetration tester, you must know the difference between confusion and diffusion. You’ll observe how that correlates to how algorithms work and the importance of strong math in configuring algorithms. And you’ll learn what happens as algorithms are used and what you need to look for in your testing results.
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cybrary

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: 18518
nptelhrd

Paper by Seny Kamara and Tarik Moataz presented at Eurocrypt 2017. See https://www.iacr.org/cryptodb/data/paper.php?pubkey=28003

Views: 256
TheIACR

In this video Renu Pareek explains
Stream Cipher
Block Cipher, Algorithm Models
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Views: 154
Guru Kpo

A hash function could be considered the same as baking a loaf of bread. You start out with inputs (flour, water, yeast, etc...) and after applying the hash function (mixing + baking), you end up with an output: a loaf of bread.
Going the other way is extraordinarily difficult - you can't really separate the bread back into flour, water, yeast - some of that was lost during the baking process, and you can never tell exactly how much water or flour or yeast was used for a particular loaf, because that information was destroyed by the hashing function (aka the oven).
Many different variants of inputs will theoretically produce identical loaves (e.g. 2 cups of water and 1 tsbp of yeast produce exactly the same loaf as 2.1 cups of water and 0.9tsbp of yeast), but given one of those loaves, you can't tell exactly what combo of inputs produced it.
Encryption, on the other hand, could be viewed as a safe deposit box. Whatever you put in there comes back out, as long as you possess the key with which it was locked up in the first place. It's a symmetric operation. Given a key and some input, you get a certain output. Given that output, and the same key, you'll get back the original input. It's a 1:1 mapping.

Views: 15600
The Sharp Turtles Gaming

Paper by Christoph Dobraunig, Maria Eichlseder, Thomas Korak, Stefan Mangard, Florian Mendel, and Robert Primas, presented at CHES 2018. See https://tches.iacr.org/index.php/TCHES/article/view/7286

Views: 87
TheIACR

For slides, a problem set and more on learning cryptography, visit www.crypto-textbook.com.
The AES book chapter for this video is also available at the web site (click Sample Chapter).

Views: 186526
Introduction to Cryptography by Christof Paar

Joan Daemen, co-inventor of Rijndael (AES) and Keccak (SHA-3), presenting at the Passwords^12 security conference, held at the University of Oslo, Norway, December 3-5, 2012.

Views: 604
Per Thorsheim

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
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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: 42477
Zariga Tongy

https://8gwifi.org/CipherFunctions.jsp
Reference book: http://leanpub.com/crypto
Computer Security, Cryptography Advanced Encryption Standard AES,fips 197
The Advanced Encryption Standard (AES) specifies a FIPS-approved
cryptographic algorithm that can be used to protect electronic data. The AES algorithm is a symmetric block cipher that can encrypt (encipher) and decrypt (decipher) information. Encryption converts data to an unintelligible form called ciphertext; decrypting the ciphertext converts the data back into its original form, called plaintext.
The AES algorithm is capable of using cryptographic keys of 128, 192, and 256 bits to encrypt and decrypt data in blocks of 128 bits.
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Views: 157015
Zariga Tongy

Cryptography Explained for Beginners: This Lisk Academy video breaks down how cryptography works in blockchain and highlights the differences between public-key cryptography vs symmetric cryptography.
Cryptography is the method of disguising and revealing information, through complex mathematics. Any piece of information can be encrypted, making it impossible to read, except for by the intended recipient.
👩🎓👨🎓Learn blockchain fast at the Lisk Academy: https://lisk.io/academy
Thanks for watching!
Lisk will make it easy for developers to build and deploy blockchain applications in JavaScript. Learn about the leading platform for world-changing apps at https://lisk.io/products.
👨💻👩💻 For developers:
GitHub: https://github.com/LiskHQ
Gitter: https://gitter.im/LiskHQ/lisk
Documentation: https://lisk.io/documentation
🔒 Store your LSK in our official wallet: https://lisk.io/hub
🔎 View our blockchain explorer: https://explorer.lisk.io/
🗞Read our latest news on the Lisk Blog: https://blog.lisk.io/
👩🚀👨🚀 Meet the team: https://lisk.io/team
🎥 For media inquiries, please email us at press [at] lisk [dot] io.
👫Join our community channels:
Reddit: http://reddit.com/r/lisk
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Facebook: http://facebook.com/liskhq
LinkedIn: https://www.linkedin.com/company/lisk/

Views: 5976
Lisk

Fundamentals of Computer Network Security
This specialization in intended for IT professionals, computer programmers, managers, IT security professionals who like to move up ladder, who are seeking to develop network system security skills. Through four courses, we will cover the Design and Analyze Secure Networked Systems, Develop Secure Programs with Basic Cryptography and Crypto API, Hacking and Patching Web Applications, Perform Penetration Testing, and Secure Networked Systems with Firewall and IDS, which will prepare you to perform tasks as Cyber Security Engineer, IT Security Analyst, and Cyber Security Analyst.
course 2 Basic Cryptography and Programming with Crypto API:
About this course: In this MOOC, we will learn the basic concepts and principles of cryptography, apply basic cryptoanalysis to decrypt messages encrypted with mono-alphabetic substitution cipher, and discuss the strongest encryption technique of the one-time-pad and related quantum key distribution systems. We will also learn the efficient symmetric key cryptography algorithms for encrypting data, discuss the DES and AES standards, study the criteria for selecting AES standard, present the block cipher operating modes and discuss how they can prevent and detect the block swapping attacks, and examine how to defend against replay attacks. We will learn the Diffie-Hellman Symmetric Key Exchange Protocol to generate a symmetric key for two parties to communicate over insecure channel. We will learn the modular arithmetic and the Euler Totient Theorem to appreciate the RSA Asymmetric Crypto Algorithm, and use OpenSSL utility to realize the basic operations of RSA Crypto Algorithm. Armed with these knowledge, we learn how to use PHP Crypto API to write secure programs for encrypting and decrypting documents and for signing and verify documents. We then apply these techniques to enhance the registration process of a web site which ensures the account created is actually requested by the owner of the email account.
Asymmetric Key Cryptography
In this module we will learn the modular arithmetic, the Euler Totient Theorm, the RSA Asymmetric Crypto Algorithm, use OpenSSL to realize the basic operations of RSA Crypto Algorithm, and Diffie-Hellman Symmetric Key Exchange Protocol to derive session keys.
Learning Objectives
• Use Diffi-Hellman algorithm for Key Exchange
• Apply RSA with OpenSSL for signing and encryption
• Describe RSA Asymmetric Crypto Algorithm
Subscribe at: https://www.coursera.org

Views: 63
intrigano

-- Created using PowToon -- Free sign up at http://www.powtoon.com/youtube/ -- Create animated videos and animated presentations for free. PowToon is a free tool that allows you to develop cool animated clips and animated presentations for your website, office meeting, sales pitch, nonprofit fundraiser, product launch, video resume, or anything else you could use an animated explainer video. PowToon's animation templates help you create animated presentations and animated explainer videos from scratch. Anyone can produce awesome animations quickly with PowToon, without the cost or hassle other professional animation services require.

Views: 195
Oorja Mathur

Security+ Training Course Index: http://professormesser.link/sy0401
Professor Messer’s Course Notes: http://professormesser.link/sy0401cn
Frequently Asked Questions: http://professormesser.link/faq
- - - - -
The speed of symmetric encryption makes it a good choice for our high-speed networks. In this video, you’ll learn about RC4, DES, 3DES, AES, Blowfish, and Twofish.
- - - - -
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/
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Google +: http://www.professormesser.com/googleplus

Views: 31607
Professor Messer

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: 641346
Art of the Problem

Paper by André Chailloux and María Naya-Plasencia and André Schrottenloher, presented at Asiacrypt 2017. See https://www.iacr.org/cryptodb/data/paper.php?pubkey=28285

Views: 93
TheIACR

Aaron Toponce will talk about symmetric and asymmetric cryptography, and the current cipher algorithms covering them, such as RSA, AES, and ECC. He'll talk about how encryption and decryption work, as well as digital signatures and verification. He'll include the Diffie-Hellman key exchange, and the SSL/TLS handshake.
Further, given the disaster on OpenSSL during the year of 2014, he'll talk about the major threats that compromised online security with SSL and TLS. He'll explain the differences between:
* SSL 2.0* SSL 3.0* TLS 1.0* TLS 1.1* TLS 1.2* TLS 1.3 (draft status)
He'll talk about the implemented ciphers and hashes, including their advantages and shortcomings. He'll discuss the attacks that took advantage of these shortcomings, such as Heartbleed and POODLE. He'll show how system administrators how to properly secure their web, mail, and other servers that require SSL/TLS.
Finally, he'll discuss OpenPGP and OpenSSH concepts. By the end of this talk, the basic mysticism that is crypto should be all cleared up.

Views: 383
Utah Open Source

Full Video Details: http://www.securitytube.net/video/38

Views: 51639
TheSecurityTube

Information Security: Principles and Practice, 2nd edition, by Mark Stamp
Chapter 3: Symmetric Key Crypto
Section 3.2.2
stream ciphers, RC4
Class Lecture, 2011

Views: 32464
Mark Stamp

symmetric encryption algorithm, DES, 3DES, etc

Views: 201
all about to code

Information Security: Principles and Practice, 2nd edition, by Mark Stamp
Chapter 3: Symmetric Key Crypto
Section 3.3.2
block ciphers, DES
Class Lecture, 2011

Views: 21350
Mark Stamp

This video covers Blowfish algorithm along with key expansion and steps.

Views: 2941
t v nagaraju Technical

Paper by Gorjan Alagic and Alexander Russell presented at Eurocrypt 2017. See https://www.iacr.org/cryptodb/data/paper.php?pubkey=28012

Views: 101
TheIACR

Information Security: Principles and Practice, 2nd edition, by Mark Stamp
Chapter 3: Symmetric Key Crypto
Section 3.3.7
block cipher modes, CBC mode, CTR mode
Class Lecture, 2011

Views: 10904
Mark Stamp

RSA Cryptosystem Algorithm (Public Key Algorithm) in Hindi with Example
Like FB Page - https://www.facebook.com/Easy-Engineering-Classes-346838485669475/
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Control System Complete Lectures - https://www.youtube.com/playlist?list=PLV8vIYTIdSnbvRNepz74GGafF-777qYw4

Views: 133430
Easy Engineering Classes

-- Created using Powtoon -- Free sign up at http://www.powtoon.com/youtube/ -- Create animated videos and animated presentations for free. PowToon is a free tool that allows you to develop cool animated clips and animated presentations for your website, office meeting, sales pitch, nonprofit fundraiser, product launch, video resume, or anything else you could use an animated explainer video. PowToon's animation templates help you create animated presentations and animated explainer videos from scratch. Anyone can produce awesome animations quickly with PowToon, without the cost or hassle other professional animation services require.

Views: 19
Vaishnavi Surve

For slides, a problem set and more on learning cryptography, visit www.crypto-textbook.com

Views: 135837
Introduction to Cryptography by Christof Paar

Information Security: Principles and Practice, 2nd edition, by Mark Stamp
Chapter 3: Symmetric Key Crypto
Sections 3.4-3.5
integrity, message authentication code, MAC
Class Lecture, 2011

Views: 8325
Mark Stamp

Symmetric key cryptographic algorithm in bangla is a part of Network security tutorials in bangla by JM Shejan. || Basic cryptography tutorial in bangla || In this video Symmetric key encription algorithm is described clearly. If you have any question you can just comment below. If you like this video please like and share. And of course Don't forget to SUBSCRIBE!
Keep Contact on facebook:
Page: https://www.facebook.com/dsteaching/
Short Details: Symmetric-key algorithms use the same cryptographic keys for both encryption of plaintext and decryption of cipher text.
Symmetric-key encryption can use two types of ciphers.
Either stream ciphers or block ciphers.

Views: 1054
JM Shejan

This video is part of a larger online course, "From Barter to Bitcoin: Society, Technology and the Future of Money" run by Prof. Bill Maurer and Prof. Donald J. Patterson In addition to the video on YouTube there is a variety of other content available to students enrolled in the class.
photocredits from the video:
https://d3tixod1wp885b.cloudfront.net/7c/b7807f6583218dcfaccf5f5f3f9284/book-safe.jpg
http://thefrencheye.blogspot.com/2011/01/bank-vault-doors.html
http://www.informationsecuritybuzz.com/securitybuzz/wp-content/uploads/google-Bot.jpg
"In 2008, a person calling himself or herself or themselves Satoshi Nakamoto released a paper suggesting a system for an anonymous, peer-to-peer alternative money. Bitcoin was born. Although not the first digital currency ever proposed, nor the first challenger to fiat money, bitcoin is the first to have captured the broad imagination of speculators, coders, regulators, criminals and the mass media. This course puts Bitcoin in context: how do we understand money as a social, political and technological phenomenon? From discussions of ancient transactions to the rise of state-issued currencies, we will explore the social and technical aspects of bitcoin, its predecessors and potential successors, and how its features echo aspects of many different historical transaction systems. No prior knowledge of economics or computing is required.
There is little academic writing on bitcoin. And this may be the first truly academic class on the topic. We want to put bitcoin in a wider perspective, to reflect on what it means for society, politics and economics, as well as how it helps us think about money both a social and a technical phenomenon. This class is not an advanced seminar on bitcoin--we will not be delving deeply into the inner workings of the system, but instead providing a bird's-eye overview with enough technical detail for you to be able to put media stories, hype and hope around bitcoin in perspective. Similarly, this is not a class in monetary economics--we won't go too deeply into monetary theory or policy, the money supply, or inflation. Instead the class invites you to think more deeply about one of the oldest systems of technology on the planet, and most ubiquitous: money, whether coin, cash, credit card or cryptocurrency, we humans have been making money for most of the past 10,000 years. How we do so in the future is a question bitcoin just maybe helps us answer."
photocredits from the video
https://d3tixod1wp885b.cloudfront.net/7c/b7807f6583218dcfaccf5f5f3f9284/book-safe.jpg
http://thefrencheye.blogspot.com/2011/01/bank-vault-doors.html
http://www.informationsecuritybuzz.com/securitybuzz/wp-content/uploads/google-Bot.jpg

Views: 3665
djp3

Symmetric block cipher seminar video explains topics on cryptography, confusion and diffusion stream cipher.

Views: 953
kasarla shashank

Information Security: Principles and Practice, 2nd edition, by Mark Stamp
Chapter 3: Symmetric Key Crypto
Section 3.3.4
block ciphers, AES
Class Lecture, 2011

Views: 7554
Mark Stamp

Lesson 2: Alice and Bob are presenting the symmetric-key cryptography.
Author: Fausto Montoya Vitini, Spanish Scientific Research Council. Madrid Script, slideshow and exercises: http://www.intypedia.com/?lang=en An intypedia team video

Views: 10804
UPM

An introduction to the new asynchronous burst oriented symmetric Cryptography API and device framework for DPDK.

Views: 50
DPDK Project

Caesar Cipher is one of the foremost ciphers in symmetric ciphers. It substitutes characters to convert plaintext to ciphertext.
Easily breakable by bruteforce.

Views: 561
Cryptography deciphered

PalaestraTraining.com
This video on Cryptography (Part 1 of 3) is part of our CISSP certification Training Series. (ISC)2 CISSP certification is one of the top security certifications you can achieve, and our expert instructor walks you step by step trough all 10 domains in the CISSP Common Body of Knowledge (CBK).
Visit us at PalaestraTraining.com for full details about this amazing series.

Views: 205997
IT Certification and Training

- symmetric
- asymmetric
- stream ciphers
- CBC mode
Exercise: combining cryptographic primitives to solve a specific problem.

Views: 266
ralienpp

In this unit, you become acquainted with the application of cryptographic algorithms. Hash values are the first type covered, followed by symmetric algorithms. Asymmetric algorithms follow, and then common cryptographic applications are presented. The unit then presents public key infrastructure (PKI), the essential elements to manage public keys. Much of this unit is a repeat from earlier material, but what is important to learn is which cryptographic algorithms are employed under which circumstances

Views: 265
Brian Green

Twofish is a block cipher by Counterpane Labs, published in 1998. It was one of the five Advanced Encryption Standard (AES) finalists, and was not selected as AES.
Twofish has a 128-bit block size, a key size ranging from 128 to 256 bits, and is optimized for 32-bit CPUs. Currently there is no successful cryptanalysis of Twofish.
https://www.schneier.com/academic/twofish/
This animation is designed by Abdullah AlQahtani
[email protected]

Views: 11925
Hemaya Group

Information Security: Principles and Practice, 2nd edition, by Mark Stamp
Chapter 3: Symmetric Key Crypto
Sections 3.1-3.2.1
stream ciphers, A5/1, shift registers
Class Lecture, 2011

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Mark Stamp

Information Security: Principles and Practice, 2nd edition, by Mark Stamp
Chapter 3: Symmetric Key Crypto
Section 3.3.7
block cipher modes, ECB mode
Class Lecture, 2011

Views: 8604
Mark Stamp

A beginner's guide to Stream Ciphers (Encryption/Decryption).

Views: 56778
Daniel Rees