The simplest form of encryption

I don't know whether i mentioned this in any of the "Hunting Tips" which appear below the clues on many pages of The Hunt. The simplest form of encryption is the kind where alphabets are replaced by numbers i.e a->1 , b->2 ...z->26.

If the numbers are more than 26, all you have to do is a MOD 26 on the number.

Btw, all clues except one have passwords which exclusively contain alphabets. Only one clue's password consists of numbers and this is clearly mentioned in the clue.