I-D ACTION:draft-ietf-smime-pkcs1-00.txt

Internet-Drafts@ietf.org Fri, 30 March 2001 13:02 UTC

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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

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