[138042] in cryptography@c2.net mail archive
Raw RSA binary string and public key 'detection'
daemon@ATHENA.MIT.EDU (Dirk-Willem van Gulik)
Thu Nov 20 11:37:23 2008
From: Dirk-Willem van Gulik <dirkx@webweaving.org>
To: Cryptography <cryptography@metzdowd.com>
Date: Thu, 20 Nov 2008 10:14:47 +0100
Been looking at the Telnic (dev.telnic.org) effort.
In essence; NAPTR dns records which contain private details such as a
phone number. These are encrypted against the public keys of your
friends (so if you have 20 friends and 3 phone numbers visible to all
friends - you need 20 subdomains x 3 NAPTR entries under your 'master').
Aside from the practicality of this - given a raw RSA encrypted block
and a list of public keys - is there any risk that someone could
establish which of those public keys may have been used to create that
block ? I.e. something which would be done in bulk for large
populations; so the use of large tables and what not is quite warranted.
Thanks,
Dw
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