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3 articles with this tag.
DSA and ECDSA stake everything on a secret random nonce that must never repeat. Sign two messages with the same nonce and the private key drops out with a little algebra. This guide runs the real attack against real DSA and secp256k1, the same flaw that broke the PS3 and drained Bitcoin wallets.
12 min read
OTR brings deniable, forward-secret encryption to instant messaging, with a SIGMA-style key exchange, DSA signatures, and the Socialist Millionaires' Protocol. Learn the full version 3 wire format, with Python code checked against NIST's own DSA test vectors.
27 min read
DSA was the U.S. government's answer to a simple question: how do you prove a message came from you, without RSA's patent? Learn how the Digital Signature Algorithm works, and why a single reused number sank Sony's PS3 security.
9 min read
