java aes encryption example

From: http://snowolf.iteye.com/blog/379860 Encryption and decryption were once an important component of my graduation project. After many years of work, it was too simple to recall the encryption and decryption algorithm at that time.To put it bluntly, here we mainly describe some encryption and decryption algorithms implemented by

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"; // encrypted content Echo mcrypt_decrypt (MCRYPT_RIJNDAEL_256, $ key, base64_decode ($ crypttext), MCRYPT_MODE_ECB, $ iv); // decrypted content In the AES encryption algorithm, MCRYPT_RIJNDAEL_128, MCRYPT_RIJNDAEL_192, and MCRYPT_RIJNDAEL_256 are usually used. The values 128, 192, and 256 indicate the bit of the Key (that is, the Encrypted Key, for example, if

, plaintext messages can not be encrypted, to encrypt plaintext messages, it is necessary to use other algorithms, to ensure confidentiality, we need to use the private key cryptography to exchange private messages.This is best understood using symmetric algorithms. For example: A encrypts a file with a key, and B reads the file, requires the same key as a, and the two sides share a private key (and in the Web environment, the private key is easy to l

);} public static void inithmac () {// string STR = "security programming technology _ encryption and decryption"; system. out. println ("plaintext:" + Str); HMAC = new HMAC (); byte [] certifycode = HMAC. createencryptor (STR); system. out. println ("ciphertext:" + new string (certifycode ));}} AES: Package COM. joye3g. ed; import Java. security. nosuchalgorithm

, Base64_decode ($crypttext), MCRYPT_MODE_ECB, $IV);/decrypted content In the AES encryption algorithm is usually used in mcrypt_rijndael_128, mcrypt_rijndael_192, mcrypt_rijndael_256 three kinds, the following 128, 192, 256 is the secret key (that is, encrypted key) How many bit, such as the use of mcrypt_rijndael_128, then use this algorithm to encrypt the secret key length is 128bit, such as $key = ' fj

used to verify the integrity of the message, and by hashing the password directly in the form of text, and so on, the current widely used algorithms have MD4, MD5, SHA-1, the message digest in Java is simple: The following is a simple example /***messagedigesttest.java*/Import Java.security.MessageDigest;/*** A single message digest algorithm that does not use a password. Can be used to hide a clear text m

In addition to DES, we also know that there are Desede (TripleDES, 3DES), AES, Blowfish, RC2, RC4 (Arcfour) and other symmetric encryption methods, the implementation of the same way, here is another algorithm of symmetric encryption--PBE PBE pbe--password-based Encryption (password-based

Ixi In actual applications, symmetric encryption is not enough. In more cases, symmetric encryption and asymmetric encryption are used in combination. asymmetric encryption (public key encryption) features slow speed, different keys for