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Re: Secure Cell Phones for State

daemon@ATHENA.MIT.EDU (William Knowles)
Mon Apr 13 12:02:49 1998

Date: Fri, 10 Apr 1998 17:59:39 -0700 (PDT)
From: William Knowles <erehwon@dis.org>
Reply-To: William Knowles <erehwon@dis.org>
To: Steve Bellovin <smb@research.att.com>
cc: John Young <jya@pipeline.com>, cryptography@c2.net
In-Reply-To: <199804101943.PAA07553@postal.research.att.com>

On Fri, 10 Apr 1998, Steve Bellovin wrote:

>> Would anyone know the security technology of this unit and its support
>> system? And how it compares to those of competitors in the US and 
>> outside?
> 	 
> The CipherTAC[tm] 2000 is a STU-III compatible add-on to Motorola's
> MicroTAC Elite[tm] cell phone.  This information courtesty of
> http://www.mot.com/GSS/SSTG/ISD/Secure_Telecom/PR_01.html

I have been meaning to ask for somewhat of a crypto phone primer
after buying a Primeco phone made by Qualcomm, and finding out 
later about the weak digital encryption it offered.  

Is the encryption on the Transcrypt Cryptophone-3 which offers 
a 'Level III hopping inversion frequency high hop rate of 150 
skips per second' any better or worse than a STU-III equipped 
phone? Or is this some sort of crypto phone snake oil?

http://www.transcrypt.com/Pages/Telephony/tele.html

Thanks!

William Knowles
erehwon@dis.org

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