Key distribution and revocation is pretty much the hard problem, at least in pragmatic terms. The details of cryptographic operations in code get a lot of scru

Key distribution and revocation is pretty much the hard problem, at least in pragmatic terms. The details of cryptographic operations in code get a lot of scrutiny, and even then there are issues. But key management combines crypto complexity with distributed system complexity, and mixes that with human propensity for operational error.