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My name is Greg Maxwell. I am a retired. My main areas of interest are cryptography, digital signal processing, error correcting codes, and computer networking. Well known organizations I previously worked at include Juniper Networks and Mozilla. I am one of the authors of the Opus audio codec (among other codecs). I've contributed to many open source protocols and packages. I mostly entertain myself with recreational mathematics and reading. In the distant past I achieved some minor notoriety for my contributions to cracking the CSS protection scheme for DVDs and for publishing a huge cache of historical and public domain academic documents that JStor was keeping behind a paywall. I was one of the earliest developers of Bitcoin and developed numerous parts of the system including the cryptographic code and many of the privacy protocols used there. Some peer reviewed publications I've coauthored include 1, 2, 3, and 4. My partner is an attorney for creative commons and has previously served on the board of organizations such as Wikimedia and the Free Software foundation.
This on-device had been reverse engineered and published to GitHub. A guy made a second preimage, meaning he had two source images and could adjust so that they'd collide.