cryptography tutorial

Word-changer passwordExample:Encrypt the following string:HELLOWORLDTransformation rules such asGet ciphertext: GswwmzmuweMulti-table override passwordExample:Encrypt the following string:HELLOWORLDTransform Rule (key): n = 5 The first

First look: Change the transparency of one image to 50%. After overlapping the two images: Source: http://leemon.com/crypto/VisualCrypto.html   You can check it out first. The author means that Party A and Party B need to transmit the

generating public and private keys using the OpenSSL command Generate private Key # OpenSSL genrsa-out Rsa_private_key.pem 1024//generate public Key # OpenSSL rsa-in rsa_private_key.pem-pubout-out rsa_public_ Key.pem Here is the sample code: ';/

Reprinted please indicate the source: Thank you http://user.qzone.qq.com/289065406/blog/1299228474   Tip: General idea: Binary + High PrecisionAlgorithm   However, there is a more clever way to deal with this question: First, make it

Symmetric encryption is the oldest and most classical encryption standard in the field of computer encryption. Although symmetric encryption is considered no longer a secure encryption method, until now, we have seen no sign of its being eliminated.

aes-ni Instruction Set Aes-ni is an extension of the x86 instruction set architecture for Intel and AMD microprocessors, presented by Intel in March 2008. [1] The purpose of the instruction set is to improve the speed with which applications use

Steps:Randomly select two large prime numbers p and q,p not equal to Q, calculate N=PQ.According to Euler function, r= (p-1) (q-1) is obtained.Select an integer w that is less than R and Coprime, and obtain a modulo inverse of w about modulo R,

Introduction: When it comes to signatures, everyone is familiar with it. As we all know, signatures are generally required for major files to ensure their authenticity and effectiveness. Some important contracts, such as the house purchase contract,

Title content: Here is a lost MD5 ciphertext e9032??? Da??? ???? 911513?0??? A2 asks you to restore him and add nctf{} to commit the known clue in plaintext: TASC? O3rjmv? Wdjkx? ZM Topic Source: Anheng CupSimple MD5 password collisions, by

This is a created article in which the information may have evolved or changed. In this section, we only give an example of MD5 and an example of SHA1, respectively, corresponding to:-MD5 algorithm under the Windows platform-Calculate SHA1 Code:

1th ChapterEncryption-DecryptionDecipherPlainText-redactionSecret keyCryptographic algorithmsSymmetric password-public key password (asymmetric password)One-way hash function-hash valueMessage Authentication CodeDigital signaturesPseudo-random

Understand and deploy symmetric encryption 1. Prepare the symmetric encryption software FatCryptoTool and office Password Recovery to crack the office Password. 2. symmetric encryption system: Dedicated encryption, fast and efficient. 3. Data

Implement encryption protection for office build applications Word: A. By default, word uses the rc4 encryption algorithm. B. Understand the risk of passwords. 1. Set the office password. 2. Crack the office password. Use Accent Office Password

Taking p=29 to find out all the solution points of elliptic curve y^2=x^3+4x+20Using the method of poor lifting to find the elliptic curveFirst step: List, find out the results of 0~28 (0Available programs to complete this step:The code is as

Playfair. h # Ifndef playfair_h# Define playfair_h # Include # Include Using namespace STD; Class Playfair{PRIVATE:Char m_ch;Int m_position;String m_key;String m_letter;Void tolower (string & Str );Bool emptykey () const;Void keysameletter ();Void

1 MD5 = Md5.create (); 2 VaR = Md5.computehash (encoding. Unicode. getbytes ( " 123456 " )); 3 Stringbuilder sb =   New Stringbuilder (); 4 Foreach (VAR item In By) 5 { 6 SB. append (item.

1. Running result   CodeAs follows: View code 1 MD5 = Md5.create (); 2 Byte [] = Md5.computehash (encoding. Default. getbytes ( " 123456 " )); 3 Stringbuilder sb =   New Stringbuilder (); 4 Foreach

The result cannot exceed the Integer Range. I used the high precision and the second point passed in poj, but I failed to pass through the ultraviolet. Later, I saw a big bull using double directly on the Internet, which is really admirable. My code:

Http://acm.hust.edu.cn/vjudge/contest/view.action? Cid = 29592 # Problem/ // File name: bo_jwolf1.cpp // Author: bo_jwolf // created time:, Sunday, August 18, 2013 # include # include # include # include # include # include # include #

Diffusion and confusion are C. e. the two basic methods proposed by Shannon to design the password system are aimed at resisting the competitor's statistical analysis on the password system. in the design of the group password, the full use of