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October 28, 2015 06:00 pm

Australian PLAID Crypto, ISO Conspiracies, and German Tanks

New submitter Gaglia writes: PLAID, the Australian 'unbreakable' smart card identification protocol has been recently analyzed in this scientific paper (disclaimer: I am one of the authors, and this is a personal statement.) Technically, the protocol is a disaster. In addition to many questionable design choices, we found ways for tracing user identities and recover card access capabilities. The attacks are efficient (few seconds on 'home' hardware in some cases), and involve funny techniques such as RSA moduli fingerprinting and... German tanks. See this entry on Matt Green's crypto blog for a pleasant-to-read explanation. But the story behind PLAID's standardization is possibly even more disturbing. PLAID was pushed into ISO with a so-called "fast track" procedure. Technical loopholes made it possible to cut off from any discussion the ISO groups responsible for crypto and security analysis. Concerns from tech-savvy experts in the other national panels were dismissed or ignored. We contacted ISO and AusCERT before going public with our paper, but all we got was a questionable and somewhat irate response (PDF) by PLAID's project editor (our reply here). Despite every possible evidence of bad design, PLAID is now approved as ISO standard, and is coming to you very soon inside security products which will advertise non-existing privacy capabilities. The detailed story of PLAID in the paper is worth a read, and casts many doubts on the efficacy of the most important standardizing body in the world. It is interesting to see how a "cryptography" product can be approved at ISO without undergoing any real security scrutiny. On a related note, the enthusiastic comments to PLAID's design made by a few readers in the old Slashdot story reminds us as a cautionary tale that you need cryptographers to assess the security of cryptography. Quoting Bruce Schneier: amateurs produce amateur cryptography.

Read more of this story at Slashdot.


Original Link: http://rss.slashdot.org/~r/Slashdot/slashdot/~3/DDzZ62dWmxQ/australian-plaid-crypto-iso-conspiracies-and-german-tanks

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