Security Researchers Crack APCO P25 Encryption

GNU Radio on /. Sorry for the HTML…

An anonymous reader writes “Two Australian security researchers, Stephen
Glass and Matt R., have published a paper that details flaws in the
encryption implementation (PDF) in the APCO Project 25 digital radio
standard, used by emergency services and police departments world-wide.
The paper details flaws in the DES-OFB and ADP encryption that enable
the encryption key to be recovered by traditional brute force key
searching. Also detailed is a DoS attack that makes use of
unauthenticated radio inhibit mechanism. The research is part of the
OP25 project, which uses GNUradio to implement a P25 stack using
software defined radio. With this solution in place, the researchers
were able to do detailed analysis of the traffic coming from various
radio systems and to transmit and receive to P25 radios in their lab.”

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Dimitrios S.