Super-Encryption

[Ben Laurie]

mlong at bridgetonconsulting.com wrote:

> 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.

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

---------------------------------------------------------------------
The Cryptography Mailing List
Unsubscribe by sending "unsubscribe cryptography" to majordomo at metzdowd.com