Adam Back

Adam Back Adam Back (born July 1970) is a British cryptographer and crypto-hacker. He is the inventor of hashcash, the proof-of-work system used by several anti-spam systems. A similar system is used in bitcoin. He implemented credlib a library that implements the credential systems of Stefan Brands and David Chaum.

He was the first to formalize the security property for email and to observe that any Identity Based Encryption scheme can be used to provide Non-Interactive Forward Secrecy.

He is also known for pioneering the use of ultra-compact code with his 3-line RSA in Perl to protest the (now relaxed) United States cryptography export regulations.

Today he is CEO of Blockstream, a company that seeks to further the development of bitcoin and block chain technology. He has a computer science Doctor of Philosophy from University of Exeter.

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