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Trip report describing Amazon's use of Lamport's TLA+[1] to aid in designing S3, DynamoDB, EBS, and an internal distributed lock manager.
[1] http://research.microsoft.com/en-us/um/people/lamport/tla/tla.html
Why do web-services tend to use preshared secret keys for client authentication instead of public keys?
(crypto.stackexchange.com)