[107494] in Cypherpunks
Re: encrypting GSM
daemon@ATHENA.MIT.EDU (Bill Stewart)
Fri Jan 15 02:36:35 1999
Date: Thu, 14 Jan 1999 23:14:29 -0800
To: Richard van Schaaik <Golf@wirehub.nl>, cypherpunks@toad.com
From: Bill Stewart <bill.stewart@pobox.com>
In-Reply-To: <369D20F0.D623499F@wirehub.nl>
Reply-To: Bill Stewart <bill.stewart@pobox.com>
At 11:40 PM 1/13/99 +0100, Richard van Schaaik wrote:
>i am looking for a hardware based unit, that encrypts the gsm signal.
>I know, that gsm is already encrypted, but i want to crypt it once again
>before it goes onto the air
How does it help? If the cellphone company isn't decrypting the
signal using the extra decryption (which it won't be),
it'll try to feed it to a voice decompressor, and you'll get
some exciting variant on white noise.
Does GSM transmit mobile-to-mobile calls purely compressed,
with no decompression anywhere? Always, or just sometimes?
Thanks!
Bill
Bill Stewart, bill.stewart@pobox.com
PGP Fingerprint D454 E202 CBC8 40BF 3C85 B884 0ABE 4639
