## CryptoDB

### Paper: Encryption Modes with Almost Free Message Integrity

Authors: Charanjit S. Jutla URL: http://eprint.iacr.org/2000/039 Search ePrint Search Google We define a new mode of operation for block encryption which in addition to assuring confidentiality also assures message integrity. In contrast, previously for message integrity a separate pass was required to compute a cryptographic message authentication code (MAC). The new mode of operation, called Integrity Aware CBC (IACBC), requires a total of m + log m block encryptions on a plaintext of length m blocks. The well known CBC (cipher block chaining) mode requires m block encryptions. The second pass of computing the MAC essentially requires additional m block encryptions. We also show a lower bound of \Omega(log m) additional block encryptions for any reasonably modeled (linear) scheme which assures message integrity along with confidentiality.
##### BibTeX
@misc{eprint-2000-11383,
title={Encryption Modes with Almost Free Message Integrity},
booktitle={IACR Eprint archive},
keywords={secret-key cryptography / Block cipher, CBC, authentication, MAC, modes of operation},
url={http://eprint.iacr.org/2000/039},
note={ csjutla@watson.ibm.com 11170 received 1 Aug 2000},
author={Charanjit S. Jutla},
year=2000
}