interesting P25 article

[batdude]

http://www.theregister.co.uk/2011/08/11/p25_vulnerable

[bezking]

Wasn't P25 radio authentication supposed to encrypt the packet header? Or am I off base?

As for the clear/secure issue, disable the switch, slave everything to secure, and OTAR those users who lost the keys... Right?

[escomm]

Wasn't P25 radio authentication supposed to encrypt the packet header? Or am I off base?

As for the clear/secure issue, disable the switch, slave everything to secure, and OTAP those users who lost the keys... Right?

They lose their key somehow and 1) can't call their team and 2) can't ask for an OTAR.

[d119]

*sigh*. A high power transmitter on the control channel output or on the conventional repeater output in close enough proximity to an operation will also render the subscribers useless.

This is a non-issue in my mind, except for the encryption being switched off.

[mr.syntrx]

Wasn't P25 radio authentication supposed to encrypt the packet header? Or am I off base?

Nope. Makes life great for an adversary engaged in the 70 year old discipline of SIGINT known as traffic analysis.

[mr.syntrx]

*sigh*. A high power transmitter on the control channel output or on the conventional repeater output in close enough proximity to an operation will also render the subscribers useless.

This is a non-issue in my mind, except for the encryption being switched off.

The most successful attack is the kind where your adversary doesn't know he is under attack. This fits that bill nicely.