A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the S/MIME Mail Security Working Group of the IETF.
Title : Preventing the Million Message Attack on CMS
Author(s) : E. Rescorla
Filename : draft-ietf-smime-pkcs1-00.txt
Pages : 5
Date : 29-Mar-01
When data is encrypted using RSA it must be padded out to the length
of the modulus--typically 512 to 2048 bits. he most popular tech-
nique for doing this is described in [PKCS-1]. However, in 1998 Ble-
ichenbacher described an adaptive chosen ciphertext attack on SSL
[MMA]. This attack, called the Million Message Attack, allowed the
recovery of a single PKCS-1 encrypted block, provided that the
attacker could convince the receiver to act as a particular kind of
oracle.
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