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1. Overview of cryptographic algorithmsThe encryption algorithm can be divided into reversible and non-reversible encryption depending on whether the content is restored.Reversible encryption can be divided into symmetric and asymmetric encryption according to whether the sa
Before everyone has summed up, based on the key exchange DH algorithm, now for you to introduce a factor decomposition based RSA algorithm, this encryption algorithm has two implementation forms: 1, public key encryption, private key decryption, 2, private key
Compilation of C ++ Encryption Algorithm Library Botan in Windows and Linux
(1) Botan Introduction
Botan Official Website: http://botan.randombit.net/
Botan is a C ++ encryption algorithm library that supports AES, Des, SHA-1, RSA, DSA, Diffie-Hellman, and other algorithms. It supports X.509 authentication and crls and
1. Overview of cryptographic algorithmsThe encryption algorithm can be divided into reversible and non-reversible encryption depending on whether the content is restored.Reversible encryption can be divided into symmetric and asymmetric encryption according to whether the sa
The classical symmetric encryption algorithm is DES algorithm, and then derives the enhanced des algorithm of 3DES, TripleDES and so on. Moreover,. NET also provides symmetric encryption algorithms such as RC2, Rijndael, and so on. The details are detailed below.
DES
Objective:
These days the company temporarily pulled to do Android IM instant Messaging protocol implementation, the general view of their agreement, because the previous did not participate, is said to be due to server performance restrictions, only to achieve a non-clear delivery, specific reasons I am not clear, but the encryption used here is the use of XOR or encryption. This
Clear text: Also known as the user can directly read the informationRedaction: Ciphertext is a collection of meaningless, messy codeEncryption: Encryption is a process of converting plaintext into redact under the control of certain algorithms and keys.Decryption: Enter a key under the control of a particular algorithm to convert ciphertext into plaintextEncryption Algo
[AES]
A symmetric encryption algorithm, used by DES.
For more information about encryption, see Java encryption and decryption symmetric encryption algorithm asymmetric encryption
1. Overview of Asymmetric encryption algorithmsAsymmetric encryption algorithm is also called Public key algorithm, which solves the problem of symmetric encryption algorithm key distribution, the basic features of asymmetric
DES (Data Encryption Standard) is a group symmetric cipher algorithm . des employs a 64-bit packet length and a 56-bit key length , which takes 64-bit inputs through a series of transformations to get 64-bit output. Decryption uses the same steps and the same key. The key length of DES is 64 bits due to the n*8 (n=1,2,... 8) is the parity bit, so the actual participation in the
= bytes.length;
int key = 0x12;
for (int i = 0; i
Testing Cryptographic decryption
byte[] bytes = Encrypt ("WHOISLCJ". GetBytes ());//Encrypt
string str1 = new String (Encrypt (bytes));//Decrypt
2. The way of not fixing key
Encryption implementation
Public byte[] Encrypt (byte[] bytes) {
int len = bytes.length;
int key = 0x12;
for (int i = 0; i
Decryption implementation
Public byte[] De
because both functions simply call the complexity with the Des_encipher and Dex_decipher of O (1), each processing a grouping call at a time.Example: CBC mode implementation of DES algorithm/*CBC.C*/#include#include"bit.h"#include"cbc.h"#include"Encipher.h"/*CBC Encryption mode in Cbc_encipher des algorithm*/voidCbc_encipher (ConstUnsignedChar*plaintext, unsigne
The basic process is very simple, then the public key encryption, the secret key decryption algorithm in the end what is it? This section briefly describes the basic principles of RSA algorithm, DSA algorithm, ECC algorithm, and Diffie-hellman
Example of the RSA encryption and decryption algorithm implemented in Java, rsa encryption and decryption
This example describes the RSA encryption and decryption algorithm implemented in Java. We will share this with you for your reference. The details are as follows:
Impor
In the previous section, we discussed that symmetric encryption can solve the problem of communication confidentiality, but it cannot guarantee the integrity of the information.Then we introduce an algorithm-one-way encryption. One-way encryption, like human fingerprints, is unique.A to B when the information will be a
Encryption of common Asp. Net tools-asymmetric encryption RSA algorithm, asp. netrsa
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1. Asymmetric Encryption Process:If there is a and B communication in the real world, in order to realize the confidentiality, completeness, availability of information in the non-Secure communication channel (three nature of information security), A and B conventions use asymmetric encrypted channels for communication, the process is as follows:Description:domestic currently using dual certificate system, that is, the user has both a signing certific
Based on previous experience, we usually use the MD5 encryption algorithm, although it can be cracked, but because of its cyclical longer, so I have been using, today learned a new encryption algorithm, secure hashing algorithm, specifically he is not the data
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