The thing about CIA is that it is commonly used in security (not
courses to mean Confidentiality, Integrity (of systems) and Availability
of Authentication).  Availability of systems, services and information.

For crypto I always talked about CAIN or PAIN (like in no PAIN
no gain, or cryptography is allot of PAIN).  -- note, I also prefer the word
Confidentiality over Privacy, the latter being to high level and I usually
it to mean the hiding of who is communicating with who (anonymity

When introducing digital signatures I always state that they provide
(as do MACs, which I introduce beforehand) but also the possibility of
non-repudiation.  And then I go on stating that it is very hard, if not
to in fact implement non-repudiation.


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