Adam Back

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Adam Back
Born Adam Back
July 1970 (age 48)
London, England, UK
Residence Sliema, Malta
Nationality British
Occupation Cryptographer
Known for hashcash

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 which inspired a similar system in bitcoin. Hashcash has also been used in a number of other protocols such as combating blog spam,[1] and defending against user namespace pollution.[2]

He implemented credlib,[3] a library that implements the credential systems of Stefan Brands and David Chaum.

He was the first to formalize the Non-Interactive Forward-Secrecy[4] 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[5] signature file and non-exportable T-shirts[6] to protest the (now relaxed) United States cryptography export regulations.

Today he is President of Blockstream, a company that seeks to further the development of bitcoin and blockchain technology.[7]

He has a computer science Ph.D. from University of Exeter.

See also


  1. " - blog plugins".<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  2. "I2P's Threat Model".<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  3. "credlib - Credential Library".<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  4. "Non-Interactive Forward Secrecy".<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  5. "export-a-crypto-system sig".<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  6. "Munitions T-shirt".<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  7. "Blockstream".<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>

External links