OMAC: One-Key CBC MAC

In this paper, we present One-key CBC MAC (OMAC) and prove its security for arbitrary length messages. OMAC takes only one key, K (k bits) of a block cipher E. Previously, XCBC requires three keys, (k + 2n) bits in total, and TMAC requires two keys, (k + n) bits in total, where n denotes the block length of E. The saving of the key length makes the security proof of OMAC substantially harder than those of XCBC and TMAC. Key words: CBC MAC, block cipher, provable security

• Type: Conference
• Year: 2003
• Where: FSE
• Authors: Tetsu Iwata, Kaoru Kurosawa
• Keywords: Block Cipher, Block Cipher E, CBC MAC, Cryptography, FSE 2003