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jabley : crypto   67

Programming Satan’s Computer
Cryptographic protocols are used in distributed systems to
identify users and authenticate transactions. They may involve the exchange of about 2–5 messages, and one might think that a program of
this size would be fairly easy to get right. However, this is absolutely not
the case: bugs are routinely found in well known protocols, and years
after they were first published. The problem is the presence of a hostile
opponent, who can alter messages at will. In effect, our task is to program a computer which gives answers which are subtly and maliciously
wrong at the most inconvenient possible moment. This is a fascinating
problem; and we hope that the lessons learned from programming Satan’s computer may be helpful in tackling the more common problem of
programming Murphy’s.
paper  security  infosec  comp-sci  crypto  protocol  design 
june 2019 by jabley

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