Common Contracts
1 similar null contracts
How to pair with a humanNovember 21st, 2009
Abstract. We introduce a protocol, that we call Human Key Agreement, that allows pairs of humans to establish a key in a (seemingly hopeless) case where no public-key infrastructure is available, the users do not share any common secret, and have never been connected by any physically-secure channel. Our key agreement scheme, while vulnerable to the human-in-the- middle attacks, is secure against any malicious machine-in-the middle. The only assumption that we make is that the attacker is a machine that is not able to break the Captcha puzzles (introduced by von Ahn et al., EUROCRYPT 2003).
