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[pdf] Why (Special Agent) Johnny (Still) Can’t Encrypt: A Security Analysis of the APCO Project 25 Two-Way Radio System
Usenix 20, 2011
Sandy Clark, Travis Goodspeed, Perry Metzger, Zachary Wasserman, Kevin Xu, and Matt Blaze

"We found a number of protocol, implementation, and user interface weaknesses that routinely leak information to a passive eavesdropper or that permit highly efficient and difficult to detect active attacks.
"new selective sub-frame jamming attacks against P25
active attacker with very modest resources can prevent specific kinds of traffic (such as encrypted messages) from being received, while emitting only a small fraction of the aggregate power of the legitimate transmitter
"found that a significant fraction of the “encrypted” P25 tactical radio traffic sent by federal law enforcement surveillance operatives is actually sent in the clear, in spite of their users’ belief that they are encrypted"
P25  public-safety  hacking  spectrum  cybersecurity 
october 2018 by pierredv
P25 digital radio systems highly vulnerable to jamming and unauthorized decryption - Nov 2011
"On August 17, 2011 at the 20th Usenix Security Symposium, Sandy Clark, Travis Goodspeed, Perry Metzger, Zachary Wasserman, Kevin Xu, and Matt Blaze presented a paper Why (Special Agent) Johnny (Still) Can’t Encrypt: A Security Analysis of the APCO Project 25 Two-Way Radio System. These noted experts conducted in-depth research on the numerous vulnerabilities of digital P25 radio systems when operated in the encrypted and clear mode. ... According to these cryptography scientists, P25 systems are strikingly vulnerable to denial of service." "... the NID is error corrected separately from the rest of the frame. This makes it possible for an attacker to effectively prevent an entire voice frame from being correctly received by synchronizing a jamming transmitter to interfere only with the 64 bit NID field"
P25  cybersecurity  vulnerability  jamming  public-safety  spectrum  hacking 
february 2016 by pierredv
P25: Not a One-Size-Fits-All Technology - Radio Resource Magazine: OnlyOnline - Feb 2015
By Andrew E. Schwartz -- "The National Public-Safety Telecommunications Council’s (NPSTC) twice-issued Project 25 (P25) position paper is an affront to the intelligence of all public-safety communications systems managers tasked with maintaining reliable solutions for their agencies/customers. In my home state, first responders use all common public-safety bands. They also lack, similar to most places, the funding to purchase expensive P25 equipment. Most public-safety first responders in my neighborhood still operate on conventional, and affordable, analog FM radios. This holds true for many public-safety first responders around the country."
P25  public-safety  NPSTC  opinion 
march 2015 by pierredv

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