[14964] in cryptography@c2.net mail archive
Re: Super-Encryption
daemon@ATHENA.MIT.EDU (Ben Laurie)
Thu Dec 18 12:05:50 2003
X-Original-To: cryptography@metzdowd.com
X-Original-To: cryptography@metzdowd.com
Date: Wed, 17 Dec 2003 10:20:55 +0000
From: Ben Laurie <ben@algroup.co.uk>
To: mlong@bridgetonconsulting.com
Cc: cryptography@metzdowd.com
In-Reply-To: <1071598695.3fdf4c6708767@66.150.199.3>
mlong@bridgetonconsulting.com wrote:
> Quoting Ben Laurie <ben@algroup.co.uk>:
>
>
>
>>Yes, but you could know all this from cipher2 and RSA of SHA1(message),
>>so I still don't see what value is added by cipher1.
>
>
> Without cipher1, implying (iv1, RSA(SHA1(message) || key1)) it is impossible
> to determine the originator of the message.
Eh? If you have RSA(SHA1(message)) then decrypting that and checking the
hash matches confirms the originator.
--
http://www.apache-ssl.org/ben.html http://www.thebunker.net/
"There is no limit to what a man can do or how far he can go if he
doesn't mind who gets the credit." - Robert Woodruff
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