(25-06-2025, 04:33 PM)oshfdk wrote: You are not allowed to view links. Register or Login to view.If I encode a character using the combination of the word length and the second character in the word (say, qOkedy is O-6 or S, cHedy is H-5 or A, oTey is T-4 or Y, pOchey is O-6 or S again), this is non-deterministic, but perfectly reversible.
You are right, but the method has to be at least partially deterministic: in your example the word length and the second character are not free.
Of course you can make any ciphering method less deterministic, for example by inserting an arbitrary number of random nulls.
In the case of the "self-citation" method, if the source of the "citation" (with modification) cannot be determined, there is no way to compare the source and the target and extract possibly meaningful information from the comparison.