Super-Encryption

[mlong at bridgetonconsulting.com]

Quoting Ben Laurie <ben at 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. Remember, I'm thinking in terms of 
XML-ENC where cipher1 is represented by 
<enc:EncryptedData>
..
</enc:EncryptedData>
and these scoping elements will be encrypted to the cipher2 result which is 
represented by another <enc:EncryptedData> and friends.

Thx,

-Matt

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