[17807] in cryptography@c2.net mail archive
Attack on Brands blind signature
daemon@ATHENA.MIT.EDU (cypherpunk)
Mon Jul 11 19:28:11 2005
X-Original-To: cryptography@metzdowd.com
X-Original-To: cryptography@metzdowd.com
Date: Mon, 11 Jul 2005 16:06:13 -0700
From: cypherpunk <cyphrpunk@gmail.com>
Reply-To: cypherpunk <cyphrpunk@gmail.com>
To: cryptography@metzdowd.com
Cc: cypherpunks@al-qaeda.net
eprint.iacr.org/2005/186 is an attack by Xuesheng Zhong on several
blind signature schemes, including one widely discussed on the
Cypherpunks mailing list back in the 1990s by Stefan Brands. The paper
seems to show that it is possible for the bank/mint to recognize blind
signatures (i.e. untraceable electronic cash tokens) when they are
re-submitted for deposit, which is exactly what the blind signature is
supposed to prevent. The math looks right although I haven't tried to
look back at Brands' old work to see if it is correctly described in
the new paper.
CP
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