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Security - News

http://crypto-world.info

Crypto - News | Security - News

11 / 2007
Vybrali pro vás: TR - Tomáš Rosa, JP - Jaroslav Pinkava, PV - Pavel Vondruška, VK - Vlastimil Klíma

Vyšel draft IETF S/M IME - Multiple Signatures in S/MIME

18.11.2007
Abstract CMS SignedData includes the SignerInfo structure to convey per-signer information. SignedData supports multiple signers and multiple signature algorithms per-signer with multiple SignerInfo structures. If a signer attaches more than one SignerInfo, there are concerns that an attacker could perform a downgrade attack by removing the SignerInfo(s) with the strong algorithm(s). This document defines the multiple-signatures attribute, its generation rules, and its processing rules to allow signers to convey multiple SignerInfo while protecting against downgrade attacks. Additionally, this attribute may assist during periods of algorithm migration.
Zdroj: http://www.ietf.org/internet-drafts/draft-ietf-smime-multisig-03.txt
Autor: JP


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