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Re: GSM crypto upgrade? (was Re: Newt's phone calls)
At 3:41 PM -0800 1/16/97, Adam Back wrote:
>Bill Frantz <[email protected]> writes:
>> At 4:39 AM -0800 1/16/97, Adam Back wrote:
>> >- PIN for phone's RSA signature keys
>>
>> It is not clear you need signatures in the secure phone case. Eric
>> Blossom's 3DES uses straight DH for key exchange with verbal verification
>> that both ends are using the same key.
>
>How does Eric's box display the negotiated key to the user? (I don't
>recall the pair I saw having displays).
I have not seen the production box, I am going from my memory of Eric's
preproduction description at a meeting last spring. I hope someone who
knows what they are talking about will butt in here if I am wrong.
The box has a 3 or 4 digit display which displays "something" about the
3DES key, where "something" is some of the bits, or a hash, or ... With 3
decimal digits, a MIM attacker has a 999 out of 1000 chance of getting
caught.
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Bill Frantz | Client in California, POP3 | Periwinkle -- Consulting
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