Mathematical Ciphers - Multiplication Shift

Hey,
Been asked ro encrypt a message using a multiplication shift cipher, first by grouping the letters into k-graphs, with k=2.

My question is, what are k-graphs and how do you deal with them in the encryption/decryption?

Thanks

Reply 1

DFranklin

I'd expect that to simply mean group them and treat the result as a 2-digit "number" in base 26 (or however many letters you have). You'd then be working as if you had an 'alphabet' of 26^2 characters.

e.g. hi becomes 7 * 26 + 8 (taking a=0, b=1, ..., h = 7, i = 8).

I might be wrong though - there are different ways you could do this, so it's a bit course specific.

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