In cryptography

Cryptography

Cryptography is the practice and study of techniques for secure communication in the presence of third parties...

, CRYPTON is a block cipher

Block cipher

In cryptography, a block cipher is a symmetric key cipher operating on fixed-length groups of bits, called blocks, with an unvarying transformation. A block cipher encryption algorithm might take a 128-bit block of plaintext as input, and output a corresponding 128-bit block of ciphertext...

 submitted as a candidate for the Advanced Encryption Standard

Advanced Encryption Standard

Advanced Encryption Standard is a specification for the encryption of electronic data. It has been adopted by the U.S. government and is now used worldwide. It supersedes DES...

(AES). It is very efficient in hardware implementations and was designed by Chae Hoon Lim of Future Systems Inc.

The CRYPTON algorithm processes blocks of 128 bits in the form of 4×4 byte arrays. The round transformation consists of four steps: byte-wise substitution, column-wise bit permutation, column-to-row transposition and finally key addition. CRYPTON uses 12 rounds of this encryption process. Due to the algorithm's nature, the decryption process can be made identical to the encryption process using a different key.

External links

• Hardware Design and Performance Estimation of The 128-bit Block Cipher CRYPTON by Eunjong Hong, Jai-Hoon Chung, Chae Hoon Lim
• SCAN's entry for CRYPTON version 0.5 as originally submitted as AES candidate to NIST
• CRYPTON: A New 128-bit Block Cipher - Specification and Analysis (Version 0.5) by Chae Hoon Lim, Hyo Sun Hwang
• CRYPTON: A New 128-bit Block Cipher - Specification and Analysis (Version 1.0) by Chae Hoon Lim, Hyo Sun Hwang
• CRYPTON 1.0 Delphi implementation