4 ms·
You can do network-specific jamming really easily (P25, the dominant digital trunked police radios, can be locked out by reprogramming a toy pager to tie up the
by rdl 13y ago
You can do network-specific jamming really easily (P25, the dominant digital trunked police radios, can be locked out by reprogramming a toy pager to tie up the trunks, for about $20 and in the milliwatts...).
JIEDDO was generally trying to jam more than just cellphones, and wanted high assurance, and while they were in motion (so, you needed range).
- shabble 13y agoI imagine you already know, but for everyone else, the full comedy of the P25 system can be found in "Why (Special Agent) Johnny (Still) Can’t Encrypt"[1] by Clark, Goodspeed & others. Chapter 4 covers the DoS using a kid's wireless IM gadget Also: > "All users operated in the clear, but gave an indication that they believed they were operating in encrypted mode. In some cases, this involved one user explaining to another how to set the radio to encrypted mode, but actually described the procedure for setting it to clear mode." [1] https://www.usenix.org/legacy/event/sec11/tech/full_papers/Clark.pdf https://www.usenix.org/legacy/event/sec11/tech/full_papers/C...