>That is a public key cryptosystem, he needs symmetric key
No, the original post didn't say that, and asymmetric key systems work in the scenario he provided. Granted they are more trouble to deal with when used properly (i.e. the decryption key is kept off the server and input -- pasted in -- at the start of each work session), but the sacrifice in convenience is made up for by the increased security.
Provided of course the users know not to do things like email someone the private key.
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Matt Robertson, [EMAIL PROTECTED]
MSB Designs, Inc. http://mysecretbase.com
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