|author||Ying-Chieh Liao <ijliao@FreeBSD.org>||2002-02-07 01:13:35 +0000|
|committer||Ying-Chieh Liao <ijliao@FreeBSD.org>||2002-02-07 01:13:35 +0000|
add ccrypt 1.2
A command-line utility for encrypting and decrypting files and streams
Notes: svn path=/head/; revision=54279
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+ccrypt is a utility for encrypting and decrypting files and streams. It was
+designed to replace 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 http://www.nist.gov/aes/). This cipher is
+believed to provide very strong security.
+Unlike unix crypt, the algorithm provided by ccrypt is not symmetric, i.e.,
+one must specify whether to encrypt or decrypt. The most common way to invoke
+ccrypt is via the commands ccencrypt and ccdecrypt. There is also a ccat
+command for decrypting a file directly to the terminal, thus reducing the
+likelihood of leaving temporary plaintext files around. In addition, there
+is a compatibility mode for decrypting legacy unix crypt files.
+Encryption and decryption depends on a keyword (or key phrase) supplied by
+the user. By default, the user is prompted to enter a keyword from the
+terminal. Keywords can consist of any number of characters, and all characters
+are significant (although ccrypt internally hashes the key to 256 bits).
+Longer keywords provide better security than short ones, since they are less
+likely to be discovered by exhaustive search.