Encryption, decryption, and OpenSSL private CA
I. Common Algorithms
Common encryption algorithms and protocols include symmetric encryption, asymmetric encryption, and one-way encryption.
1. symmetric encryption: one key is used f
Symmetric encryptionSymmetric encryption is the fastest and simplest way to encrypt encryption (encryption) and decryption (decryption) with the same key (secret key). Symmetric encryption has many algorithms, and because of its high efficiency, it is widely used in the core of many cryptographic protocols.Symmetric
After that, we will introduce the new module cryptographer in the Enterprise Library. This module plays an important role in most daily projects, for example: the website member password, ID card number, and website configuration can be encrypted to ensure the security of project data.
We will introduce the following points today:
1. Simple Analysis of the enterprise database cryptographer (encryption module.
2. Implement a custom
recommend for you, because I will strongly recommend the Hashing API that you will discuss later, however, Bcrypt is also a good encryption method.
The Code is as follows:
Function generateHash ($ password ){If (defined ("CRYPT_BLOWFISH") CRYPT_BLOWFISH ){$ Salt = '$ 2y $11 $'. substr (md5 (uniqid (rand (), true), 0, 22 );Return crypt ($ password, $ salt );}}
Bcrypt is actually a combination of Blowfish
There are several types of encryption in PHP:1. MD5 EncryptionString MD5 (string $str [, bool $raw _output = false])ParametersSTR--the original string.Raw_output--If the optional raw_output is set to TRUE, then the MD5 Digest is returned in the original binary format of 16 bytes in length.This is a non-reversible encryption, execute the following code$password = ' 123456 ';echo MD5 ($password);Get the resul
Disadvantage: different keys are used between different sessions, so too many keys are maintained.
Implementation:
Des: Data Encryption Standard 56bit encryption (this is not commonly used)
3DES: After three des
AES: Advanced Encryption Standard, which has many variants, such as aes192 aes256
Blowfish: Thi
This article is a basic article on Software encryption technology. It briefly introduces some basic knowledge about Software Encryption and some encryption products. It is suitable for domestic software developers or individual software developers to share their reference.
1. encryption technology Overview
The securi
There are several ways to encrypt in PHP
1. MD5 Encryption
String MD5 (string $str [, bool $raw _output = false])
Parameters
STR--the original string.
Raw_output--If the optional raw_output is set to TRUE, MD5 Digest will return in its original binary format in 16-byte length.
This is an irreversible encryption that executes the following code
$password = ' 123456 ';echo MD5 ($password);The result is
Summary of Cocos2d-x resource encryption and decryption practices, cocos2d-x encryption and decryption
This article is Siliphen original, reproduced please indicate the source: http://blog.csdn.net/stevenkylelee
This article is aimed at the cocos2d-x 3.4 version of research.
How to implement encryption and decryption
Brief Introduction to
encryption key is 1, and the encryption algorithm is for each +234567 --> 123456 the decryption key is also 1, and the decryption algorithm is for each-The encryption algorithm (+) and the decryption algorithm (-) are called symmetric encryption,Likewise, asymmetric encryption
Overview : Two computers when communicating on the Internet, the information sent between them without special processing, that is, the encryption mechanism, it is easy to be obtained by other people, if it is ordinary information, it does not matter, but if it involves the private information of individuals, it is not very bad, This article is about this security and encryption mechanism.
Cryptograph
enterprise shares an encryption key, the confidentiality of the entire enterprise document cannot be discussed.
Common symmetric encryption algorithms: des and 3DES, Desx, blowfish, idea, RC4, RC5, rc6, andAES
Asymmetric encryption
RefersEncryption and decryption use encry
updat and the input. Otherwise, it will be the content of this inout.
/*Security Program DESede/DES Test*/Import java. security .*;Import javax. crypto .*;Public class testdes {Public static void main (String [] args ){Testdes my = new testdes ();My. run ();}Public void run (){// Add a new security algorithm. If JCE is used, add it.Security. addProvider (new com. sun. crypto. provider. SunJCE ());String Algorithm = "DES"; // defines the encryption Al
The encryption system has three basic deployment directions: storage, transmission, and authentication. Because the Internet is not a trusted transmission channel, there may be various threats, such as listening, interception, and malicious modification. Therefore, the transmission direction is the biggest direction for enterprises to require encryption systems. As enterprises pay more and more attention to
are: des algorithm, 3DES algorithm, Tdea algorithm, Blowfish algorithm, RC5 algorithm, Idea algorithm.
There are also encapsulated symmetric cryptographic functions in PHP
Urlencode/urldecode
string UrlEncode (String $str)/
*
1. A parameter that passes in the string to be encrypted (usually applied to the encryption of the URL)
2. UrlEncode for bidirectional
Cryptographic decryption related conceptsThree ways in which man-in-the-middle attacks are commonly used on the Internet: 1) eavesdropping 2) data tampering 3) session hijackingClassification of cryptographic algorithm protocols:
a) symmetric encryption
commonly used are: DES, 3DES, AES, Blowfish, RC6, CAST5, etc. Features: 1. Encrypt and decrypt using the same key. 2. split the original da
decrypt;Common algorithms: MD5 (128bits), SHA1 (160bits), sha224, sha256, sha384, sha512 ...2, symmetric encryption: Encryption and decryption using the same key;Features: (1) encryption and decryption using the same key, (2) The original data is divided into fixed-size blocks, encrypted one by one;Function: Good encryption
Http://www.cnblogs.com/1-2-3/archive/2007/09/17/colloquialism-digital-certificate-part1.htmlSummaryThis series is easy to read, so you can understand the basic principles of digital signatures and how to apply them (even if you are an enterprise boss who is not computer savvy, you can read this article). Then we step into the technical details, and finally will give a B/s information system using the digital signature demo.Because the digital signature is based on asymmetric
Objective:
Recently accidentally and colleagues to exchange data security transmission problems, think of their own used RSA asymmetric encryption algorithm, idle down to sum up.
Several other encryption methods:
RSA encryption of Android data encryptionAES encryption of Android data encryptionDes
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