ccrypt
Crypt and Decrypt Files and Streams with AES
ccrypt is a utility for encrypting and decrypting files and streams. It was designed as a replacement for the standard unix crypt utility, which is notorious for using a very weak encryption algorithm. ccrypt is based on the Rijndael cipher, which is the U.S. government's chosen candidate for the Advanced Encryption Standard (AES, see <a href="http://www.nist.gov/aes">http://www.nist.gov/aes</a> ). This cipher is believed to provide very strong security.
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