Cryptology ePrint Archive: Report 2005/067

Colliding X.509 Certificates

Arjen Lenstra and Xiaoyun Wang and Benne de Weger

Abstract: We announce the construction of a pair of valid X.509 certificates with identical signatures.

Category / Keywords: applications / hash collisions, X.509 certificates

Date: received 1 Mar 2005, last revised 6 May 2005

Contact author: b m m d weger at tue nl

Available format(s): PDF | BibTeX Citation

Note: This announcement now appears (slightly rewritten) in an appendix to the full version of the paper "On the possibility of constructing meaningful hash collisions for public keys" by Arjen Lenstra and Benne de Weger. This paper will be presented at ACISP 2005, Brisbane, July 4-6. Due to page limitations the appendix could not be incorporated in the "proceedings version" of the paper. The appendix appears only in the "full version" of the paper, which can be downloaded from

Version: 20050506:143625 (All versions of this report)

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