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SACRYPT
2005
Springer

An Attack on CFB Mode Encryption as Used by OpenPGP

10 years 9 months ago
An Attack on CFB Mode Encryption as Used by OpenPGP
This paper describes an adaptive-chosen-ciphertext attack on the Cipher Feedback (CFB) mode of encryption as used in OpenPGP. In most circumstances it will allow an attacker to determine 16 bits of any block of plaintext with about 215 oracle queries for the initial setup work and 215 oracle queries for each block. Standard CFB mode encryption does not appear to be affected by this attack. It applies to a particular variation of CFB used by OpenPGP. In particular it exploits an ad-hoc integrity check feature in OpenPGP which was meant as a “quick check” to determine the correctness of the decrypting symmetric key.
Serge Mister, Robert J. Zuccherato
Added 28 Jun 2010
Updated 28 Jun 2010
Type Conference
Year 2005
Where SACRYPT
Authors Serge Mister, Robert J. Zuccherato
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