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Exposing Crypto Bugs through reverse engineering

URL
http://events.ccc.de/congress/2009/Fahrplan/attachments/1462_26c3_oechslin_crypto_bugs.pdf
File name
1462_26c3_oechslin_crypto_bugs.pdf
File size
2.6 MB
MD5
ef639f0359236eacd15f03d124e5bb5d
SHA1
79bbd4d5e4775cc1c3373f34c69e337e5cb4a280

Breaking good crypto is hard. It takes a genius to find a flaw in AES or Blowfish. On the other hand, it is also difficult to program cryptography correctly. Thus the simpler way of breaking a cryptographic software is often to reverse engineer it and find the crypto errors that were made by the programmers. In this talk the simple errors will be demonstrated that were discovered when reverse engineering three products for evaluation or forensic purposes. In each case, a simple error gave access to information that was supposed to be protected by the best crypto algorithms. The demos will be the following: * the FIPS 142-3 level 2 certified MXI stealth USB key (before it got patched) * a version of the E-capsule private safe from EISST * Data Beckers now defunct Private Safe software

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