A Mode of Operation with Partial Encryption and Message Integrity

Philip Hawkes; Gregory G.  Rose

Paper 2003/001

A Mode of Operation with Partial Encryption and Message Integrity

Philip Hawkes and Gregory G. Rose

Abstract

At the recent AES Modes of Operation Conference, several modes of operation were proposed for using a block cipher to provide both confidentiality and authentication. These modes require only a little more work than the cost of encryption alone, and come with proofs of security. However, these modes require the entire message to be sent in encrypted form. This can cause problems in situations where some of the message neeeds to be sent in plaintext while still being authenticated. This paper describes a simple variation that allows any choice of message blocks to be sent in plaintext form rather than in encrypted form. This mode, Partial Encryption with Message Integrity (PEMI), is shown to be secure for message integrity and message secrecy.

Metadata

Available format(s): PDF
Category: Secret-key cryptography
Publication info: Published elsewhere. Unknown where it was published
Keywords: Partial encryption message integrity modes of operation
Contact author(s): ggr @ qualcomm com
History: 2003-01-07: received
Short URL: https://ia.cr/2003/001
License: CC BY

BibTeX

@misc{cryptoeprint:2003/001,
      author = {Philip Hawkes and Gregory G.  Rose},
      title = {A Mode of Operation with Partial Encryption and Message Integrity},
      howpublished = {Cryptology ePrint Archive, Paper 2003/001},
      year = {2003},
      note = {\url{https://eprint.iacr.org/2003/001}},
      url = {https://eprint.iacr.org/2003/001}
}