[21557] in cryptography@c2.net mail archive
Re: Creativity and security
daemon@ATHENA.MIT.EDU (brucee@chunder.com)
Thu Mar 23 20:53:51 2006
X-Original-To: cryptography@metzdowd.com
X-Original-To: cryptography@metzdowd.com
Date: Thu, 23 Mar 2006 17:55:07 -0500
From: brucee@chunder.com
To: cryptography@metzdowd.com
Blanking out all but the last 4 digits is foolish. The last is a checksum
and the first four are determined by the merchant. This greatly reduces
the possibilities for the other 8 digits. I'd rather just Bank Name or even
the first 4 digits. (I know that amex use only 15, even worse.)
brucee
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