Modified Parameter Attacks: Practical Attacks against CCA2 Secure Cryptosystems and Countermeasures

Nick Howgrave-Graham; Joseph H.  Silverman; Ari Singer; William Whyte

Paper 2004/344

Modified Parameter Attacks: Practical Attacks against CCA2 Secure Cryptosystems and Countermeasures

Nick Howgrave-Graham, Joseph H. Silverman, Ari Singer, and William Whyte

Abstract

We introduce the concept of Modified Parameter Attacks, a natural extension of the idea of Adapative Chosen Ciphertext Attacks (CCA2) under which some CCA2 secure systems can be shown to be insecure. These insecurities can be addressed at the application level, but can also be addressed when cryptographic schemes are being designed. We survey some existing CCA2 secure systems which are vulnerable to this attack and suggest practical countermeasures.

Metadata

Available format(s): PDF
Category: Public-key cryptography
Publication info: Published elsewhere. Unknown where it was published
Contact author(s): wwhyte @ ntru com
History: 2004-12-11: revised; 2004-12-11: received; See all versions
Short URL: https://ia.cr/2004/344
License: CC BY

BibTeX

@misc{cryptoeprint:2004/344,
      author = {Nick Howgrave-Graham and Joseph H.  Silverman and Ari Singer and William Whyte},
      title = {Modified Parameter Attacks: Practical Attacks against CCA2 Secure Cryptosystems and Countermeasures},
      howpublished = {Cryptology ePrint Archive, Paper 2004/344},
      year = {2004},
      note = {\url{https://eprint.iacr.org/2004/344}},
      url = {https://eprint.iacr.org/2004/344}
}