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Thanks to Takako Hickey, Roy Friedman, Robbert van Renesse, Zhen Xiao, and Ohad Rodeh for descriptions of their contributions.
1
MAC, Message Authentication Code. This is typically a keyed hash function.
2
symmetric encryption/MAC is roughly 1000 times faster than equivalent public key operations.
3
An Ensemble address is comprised of a set of identifiers, for example an IP address and a PGP principal name. Generally, an address includes an identifier for each communication medium the endpoint is using {UDP,TCP,MPI,ATM,..}.
4
Polymorphic comparison is used here.