More Military Cryptanalytics, Part III
August 31 2021Late last year, the NSA declassified and released a redacted version of Lambros D. Callimahos’s Military Cryptanalytics, Part III. We just got most of the index. It’s hard to...
Read moreIntentional Flaw in GPRS Encryption Algorithm GEA-1
June 17 2021
General Packet Radio Service (GPRS) is a mobile data standard that was widely used in the early 2000s. The first encryption algorithm for that standard was GEA-1, a stream...
Read moreThe Story of Colossus
May 6 2021Nice video of a talk by Chris Shore on the history of Colossus.
Read moreNo, RSA Is Not Broken
March 5 2021
I have been seeing this paper by cryptographer Peter Schnorr making the rounds: “Fast Factoring Integers by SVP Algorithms.” It describes a new factoring method, and its abstract...
Read moreMilitary Cryptanalytics, Part III
January 4 2021
The NSA has just declassified and released a redacted version of Military Cryptanalytics, Part III, by Lambros D. Callimahos, October 1977.
Parts I and II, by Lambros D. Callimahos...
Read moreCellebrite Can Break Signal
December 21 2020
Cellebrite announced that it can break Signal. (Note that the company has heavily edited its blog post, but the original — with lots of technical details —...
Read moreZodiac Killer Cipher Solved
December 16 2020
The SF Chronicle is reporting (more details here), and the FBI is confirming, that a Melbourne mathematician and team has decrypted the 1969 message sent by the...
Read moreCryptanalysis of an Old Zip Encryption Algorithm
August 12 2020Mike Stay broke an old zipfile encryption algorithm to recover $300,000 in bitcoin. DefCon talk here....
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