Adam Back
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Adam Back is a British cryptographer and crypto-hacker.
He is the inventor of hashcash, a proof-of-work system for protecting against email spam and other denial-of-service attacks. He wrote credlib [1], a library that implements the credential systems of Stefan Brands and David Chaum. He was the first to formalize the Non-Interactive Forward-Secrecy security property for email and first to observe that any Identity Based Encryption (IBE) can be used to provide Non-Interactive Forward Secrecy [2].
He is also known for pioneering the use of ultra-compact code in signature files and T-shirts to protest the (now relaxed) U.S. cryptography export regulations.[citation needed]
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