Re: [TSCM-L] {1524} Re: FHSS telephone security
coderman wrote:
> On 5/7/07, kondrak <kon..._at_phreaker.net> wrote:
>> It IS secure...
>
> i would have to argue otherwise, in the sense that the only security
> provided is based on the pseudo random hop sequence, which is easily
> discerned. (secure against a baby monitor or narrow band scanner,
> yes. but i don't think that's the nature of security in question
> here.)
>
>
>> I had a phone ... that used spread spectrum to communicate with the
>> base station, while the conversation was in the clear.
>
> almost every FHSS phone system i've seen (excluding military units)
> operate this way. hence the "security" is due to channel hopping, and
> not any kind of transport privacy via encryption.
>
>
>> I dont know why
>> anyone would engineer a product that way
>
> economics. much, much cheaper to carry an analog voice stream over a
> FHSS carrier than to implement good privacy via encryption.
>
> again, i would encourage use of a WPA2 VoIP phone instead of a FHSS
> system. this gives you DSSS spectrum usage (possibly OFDM) and an AES
> encrypted privacy layer on top to carry the conversation.
>
> best regards,
>
> >
>
Received on Sat Mar 02 2024 - 00:57:25 CST
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