cryptography tutorial

-sha-384:384 bits, the message limit is 2128 bits, has not been breached.SHA-2 generation-sha-512:512 bits, the message limit is 2128 bits, has not been breached.Attack on one-way hash functionBrute force : attempts to crack the "weak anti-collision" attack of a one-way hash function.Birthday Attack : This is a "strong anti-collision" attack that attempts to crack a one-way hash function.A one-way hash function can identify "tamper", but cannot discern "camouflage".The technologies used for auth

-IP Protocol (Internet Protocol). SSL/TLS Communication protocols that we use in scenarios such as online shopping.Realization method of message authentication code Implemented using a one-way hash function Message authentication codes can be implemented using a one-way hash function such as SHA-1, MD5, which is called an HMAC. Using a block cipher implementation Message authentication codes can be implemented using block ciphers such as Des and AES.

Useful PHP with public key cryptography class sharing (every time encryption results are different OH), PHP encryption Web Interactive security has always been a major site of the first solution, this article introduces the PHP encryption class is very practical oh, with the public key, this is the biggest bright spot, no public key is not decrypted, plus density is very high. Class Code: Key } srand (Double) microtime () *1000000); $encrypt

SSL/TLS is the most widely used password communication method in the world. It uses cryptographic techniques such as symmetric password, message authentication code, public key password, digital signature, pseudo-random number generator and so on.Cipher SuiteSSL/TLS provides a framework for password communication, a symmetric password used in SSL/TLS, a public key password, a digital signature, a one-way hash function, and other techniques that can be replaced if the cryptographic technology use

How does cryptography protect block chains ?, Cryptography is a protected area Cryptography is a science that Applies mathematical functions to ensure data security. Many popular movies and TV works imply that any system can be cracked if there are enough hackers. This "Hollywood hacker attack" is not a real-world scenario-hackers must discover system vulnerabili

Both A and B were on two islands. B is sick, and a has the medicine that B needs. C has a boat and a lockable box.C is willing to carry things between A and B, but things can only be placed in boxes. As long as the box is unlocked, C will steal everything from the box,No matter what's in the box. If A and B each have a lock and can only open the key of their own lock, how should a be delivered to B?Answer: A put the medicine in the box, lock the box with your own locks. b After getting the box,

Today Learning elliptic curve cipher (Elliptic Curve CRYPTOGRAPHY,ECC) algorithm, his hand lacks the introduction of the algorithm of professional books, so on the internet to check a lot of blog and books, but most of the blog writing is really ... You know... Really deserves to be ' the world article a big copy ' Ah! The same does not say, the key is the introduction is not very clear, is I in the process of reading, produced a lot of doubts can not

The current password must be tested by countless people, proving that there is no trap. If you are not public, no one believes in the security of your algorithm.Many algorithms are later proven to be unsafe. Simply put, the three main foundations of modern cryptography are:1, the introduction of large prime numbers;3, the irreversible nature of the algorithm;2, based on computer operation rather than hand calculation.Based on these three points, in

The basis of probability theory Suppose X and y are random variables defined on a finite set of x and Y respectively. Joint probability P (xi,yi) p (x_i,y_i) is the probability of X=xi,y=yi x=x_i and y=y_i. Conditional probability P (xi|yi) p (x_i \vert y_i) is the probability of Y=yi y=y_i when X=xi x=x_i. If there are P (x,y) =p (x) p (Y) p (x, y) = P (x) p (y) in any x∈x,y∈y x \in x, y \in y, then the random variable x and y are statistically independent. Bayes theorem: P (x| Y) =p (X) P (y

powerful protection for information security. We will wait and see where the encryption technology will go in the future. References:[1] Douglas R. Stinson. Principles and Practices of cryptography. Beijing: Electronics Industry Press, 131-132[2] Simon Singh. Password story. Haikou: Hainan press, 271, 272-The RSA Algorithm of encryption algorithm-http://soft.winzheng.com/infoView/Article_296.htm,2003[4] encryption and digital signature-http://www.njt

[Cryptography 02] cryptographic system principles and mathematical background In the previous article [cryptography], four theme topics briefly introduced the technical means used to achieve the confidentiality and integrity of information transmission, as well as identity authentication and anti-Repudiation: 1) Password Technology (encryption and decryption ). 2) Hash technology, that is, Hash technology.

In-depth introduction to cryptography-Principles and Applications of common encryption technologiesBasic Information Original Title: Understanding Cryptography: a textbook for students and practitioners Author:Christof paar [Us] Jan pelzl Translator: Ma xiaoting Series Name:Classic Security Technology Translation Press: Tsinghua University Press ISBN:9787302296096 Mounting time: Published on: Feb

information security needs, almost all-encompassing. From cryptographic algorithms to key negotiation, from streaming passwords to block passwords, from symmetric encryption to asymmetric encryption, from RSA to elliptic curves, from hash algorithms to Packet Authentication, there is almost everything from encoding methods to compression algorithms. Therefore, in C ++ programming, if information security needs are met, it is sufficient to introduce proxyto ++. Crypto ++ extensively uses the C +

Significance: The development of public key cryptography is the greatest revolution in the history of cryptography, perhaps the only one. Rotary Press and DES are important symbols of cryptography development, but they are all based on substitution and substitution of these elementary methods. put forward the background: to solve the two most difficult problems i

If you're getting one of the following exception messages in your application: Message:Keyset does not exist Stacktrace:At system. Security. cryptography. cryptographicexception. throwcryptogaphicexception (int32 hr)At system. Security. cryptography. safeprovhandle. _ freecsp (intptr pprovctx)At system. Security. cryptography. safeprovhandle. releasehandle ()A

Because the proxy restriction cannot use the PIP Install Cryptography command installs the cryptography, therefore installs this Python library to toss the day many time, almost suspected the life, fortunately steady, the surprise appeared. Share your experience below:Environment win7,34 BitDownload cryptography1.6URL https://pypi.python.org/pypi/cryptography/Unz

supported by CMake); The build type is debug (regardless of file name);The last two lines are the absolute paths of the C and cxx compiler addresses, which are the cl.exe in the IDE folder;(If the hint Mspdb100.dll can not find, need to path=%path%; F:\Program Files (x86) \microsoft Visual Studio 10.0\Common7\IDE)Note: When entering the path, be sure to use the/(CMake syntax) and "" (because the space is segmented, so there are spaces in the path to use "" package).3.1.5 compile, you can use th

Basic cryptography knowledge I recently liked the CSDN forum and encountered many questions about cryptography. I found that many people do not have enough basic knowledge about cryptography, which may cause some misunderstandings or even jokes. For example, MD5 encryption, MD5 decryption, and so on. I think that since everyone is engaged in software or programm

Transferred from: http://www.smatrix.org/bbs/simple/index.php?t5662.html//////////////////////////////////////////////////////////////////////////////Directory1. PHP hash function and its application2. Symmetric cipher algorithm in PHP and its application3. PHP's public key cryptography algorithm and its application///////////////////////////////////////////////////////////////////////////////2 symmetric cipher algorithm in PHP and its applicationI've

1. Data encryption principleWe will build an efficient and undocumented bookmark scheme. Because conversion does not recognize the paradigm of cryptographic and signature schemes into combinatorial certificate protocols, we use the practice of extending the traditional signing method with the certificate-free key authentication mechanism to pair authentication with identity-based technology to authenticate the associated public key.The traditional password system calculates the corresponding pub