This page contains interviews and presentations about OP25.
Bricking police radios with P25 vulnerabilities -- an interview with Stevie following Stevie+Matt's RUXCON 2010 presentation.
Balint's "GRC based P25 DES-OFB receiver" video that demonstrates P25 reception from an encrypted XTS5000 being received by OP25 using a $20 USB TV dongle:
Matt's APCO P25 Security Revisited: The Practical Attacks talk on P25 security flaws from RUXCON 2011:
Balint's "Hacking the wireless world with Software Defined Radio" talk from RUXCON 2011: