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Steve Glass stevie.glass@gmail.com [op25-dev] op25-dev at yahoogroups.comIn fairness, the code Matt linked to above was the stuff I used to recover the bit scheduling of the RC4 cipher. I'd forgotten that it was even online :) Turns out P25 adopts a really simple scheme and throws away RC4 ciphertext octets exactly where you'd expect it to (compare it with DES/OFB which has a similar structure and throws away ciphertext octets at the same position). The only difference is that P25 skips the first 256 octets of the ciphertext because of a known weakness in RC4. Would be great to see auto-recovery; even manual key entry would be cool. I'm unlikely to look at it soon as I'm up to my neck in GSM right now! -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 931 bytes Desc: OpenPGP digital signature URL: <http://lists.osmocom.org/pipermail/op25-dev/attachments/20150211/f4412912/attachment.bin>