- RC5 Arbitrary-sized key. Designed by Ron Rivest.
- Not completely convincing in security. About as
- fast as Blowfish, but with a quicker key
- schedule. Patented, I think.
+ IDEA Requires a 128-bit key. About as fast as DES.
+ No known attacks on the full cipher. Used in
+ PGP2. Patented!
+
+ RC2 Arbitrary-sized key, up to 128 bytes. Used to
+ be a trade secret of RSA Data Security Inc., but
+ leaked. About as fast as DES. Not convincing
+ in terms of security. Has a bizarre
+ `brain-damage' feature which limits the
+ effective key size.
+
+ RC5 Arbitrary-sized key, up to 256 bytes. Designed
+ by Ron Rivest. Not completely convincing in
+ security. Almost as fast as Blowfish, but with
+ a quicker key schedule. Patented!
+
+ Rijndael Accepts keys which are a multiple of 32 bits in
+ size, up to 256 bits. 128-bit block. AES
+ finalist. Fast, may not be strong.
+
+ Serpent Arbitrary-sized keys up to 256 bits. 128-bit
+ block. AES finalist. About the same speed as
+ DES. Very conservative design. Looks very
+ strong.
+
+ Twofish Accepts keys which are a multiple of 32 bits in
+ size, up to 256 bits. 128-bit block. AES
+ finalist. Fast, looks strong.