Tightness of the Security Bound of CENC

Symmetric Cryptography

计算机科学;物理学

Tetsu Iwata

Others  :  http://drops.dagstuhl.de/opus/volltexte/2007/1016/pdf/07021.IwataTetsu.Paper.1016.pdf
PID  :  10457

学科分类：计算机科学（综合）

来源: CEUR

【 摘 要 】

CENC (Cipher-based ENCryption) is the recently designed encryption mode for blockciphers. It is provably secure with beyond the birthday bound. In this note, we present a simple distinguishing attack on CENC, and show that the attack is the best attack for some parameter. This proves the tightness of the security bound, and gives a partial answer to the open question posed at FSE 2006.