A Challenging But Feasible Blockwise-Adaptive Chosen-Plaintext Attack on SSL (2006)
| Venue: | SECRYPT 2006, PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON SECURITY AND CRYPTOGRAPHY, SET'UBAL |
| Citations: | 5 - 1 self |
BibTeX
@INPROCEEDINGS{Bard06achallenging,
author = {Gregory V. Bard},
title = {A Challenging But Feasible Blockwise-Adaptive Chosen-Plaintext Attack on SSL},
booktitle = {SECRYPT 2006, PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON SECURITY AND CRYPTOGRAPHY, SET'UBAL},
year = {2006},
pages = {7--10},
publisher = {INSTICC Press}
}
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Abstract
This paper introduces a chosen-plaintext vulnerability in the Secure Sockets Layer (SSL) and Trasport Layer Security (TLS) protocols which enables recovery of low entropy strings such as can be guessed from a likely set of 2--1000 options. SSL and TLS are widely used for securing communication over the Internet. When utilizing block ciphers for encryption, the SSL and TLS standards mandate the use of the cipher block chaining (CBC) mode of encryption which requires an initialization vector (IV) in order to encrypt. Although the first IV used by SSL is a (pseudo)random string which is generated and shared during the initial handshake phase, subsequent IVs used by SSL are chosen in a deterministic, predictable pattern; in particular, the IV of a message is taken to be the final ciphertext block of the immediately-preceding message, and is therefore known to the adversary. The one-
