IDEA The International Data Encryption Algorithm (IDEA) was developed by Xuejia
Lai and James Massey. The block size is 64 and the key size is 128. It can be implemented
in both hardware and software.
Blowfish Blowfish was developed by Bruce Schneier. The block size is 64 and the
key size between 32 and 448.
CAST-128 CAST-128 was developed by Carlisle Adams and Stafford Tavares. It is a
Feistel cipher with 16 rounds and a block size of 64 bits; the key size is 128 bits.
ReS RCS was designed by Ron Rivest. It is a family of ciphers with different block
sizes, key sizes, and numbers of rounds.
Mode of Operation
A mode of operation is a technique that employs the modern block ciphers such as DES
andAES that we discussed earlier (see Figure 30.19).
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