Hi all,

I'll likely post the revised project spec towards the end of this week. After that point, the spec can be considered "frozen" (as per the guidelines here).

A few corrections or clarifications I'll be making:

• For the Caesar functions, the key will be allowed to be in the range (range_low - range_high) (which will be negative) through to (range_high - range_low), inclusive – since otherwise, the key would be limited to non-negative values, and it wouldn't really make sense to say that decryption is exactly equivalent to encrypting with a negative key.

  (There are potentially other ways of making the spec consistent, e.g. by defining the semantics of Caesar decryption in terms of moduli, but allowing negative keys is the simplest way in my opinion.)

• For the Vigenère functions, it's a precondition of the function that all characters in the key must fall entirely between low_range and high_range (inclusive).

Cheers,

Arran