Validation nits (from Casey Deccio)

[paulehoffman]

The first two definitions above consider the only validity of...

Should be "only the" instead of "the only" (that typo was inherited from the text I contributed).

The terms "authentication" and "verification" are used
interchangeably with "validation" in the sense of the third
definition above.

In the sense of (only) the third definition, only "authentication" is interchangeable with "validation". However, "verification" and "validation" are interchangeable for all three definitions. This can be seen by searching "verify" and "verification" in RFC 4033 and RFC 4034, for example.

My recommendation is that 1) this sentence is rewritten as follows:

The term "authentication" is used
interchangeably with "validation", in the sense of the third
definition above.

Either the term "Validation:" is changed to "Validation/Verification:" and/or a new term is added: "Verification: (see Validation)";

If some of the references (e.g., from RFC 4033) for verification should be added to the text, then I can help with that, but I'm not sure it's necessary.