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yet we all still use passwords
Digital signatures have been around for getting on for 20 years now
It is illegal to use asymmetric public key cryptography with a modulus greater than 256 in "free" Britain.
United KingdomThe Regulation of Investigatory Powers Act 2000 (RIPA), Part III, activated by ministerial order in October 2007, requires persons to supply decrypted information and/or keys to government representatives with a court order. Failure to disclose carries a maximum penalty of two years in jail. The provision was first used against animal rights activists in November 2007, and at least three people have been prosecuted and convicted for refusing to surrender their encryption keys, one of whom was sentenced to 13 months' imprisonment.
PGP is freely available on the internet and freely available to everyone