Patent ID: 7627116

Claim:
A system for sharing a random process between at least two separate parties in secret manner based on a publicly available primary digital bitstream, the system comprising a public electronic network linking electronic processors of at least two parties for communication over said electronic network, there being at said electronic processors of each party: holding units respectively for holding a regularly changing copy of part of said publicly available primary digital bitstream, said publicly available primary digital stream being located externally to the at least two separate parties, on said public electronic network, and regularly changing, said copy being available at respective ones of said separate parties, and a selector at each party configured for randomly selecting said regularly changing part of said regularly changing primary digital bitstream in a selection operation, to form a regularly changing random bit source, wherein each selector is operable to use said regularly changing random bit source to randomize said selection operation in an identical manner at each separate party, thereby to render said regular changes of said random bit source available at respective ones of said at least two separate parties.