I am trying to encrypt "COMPUTER" using function f(x) = (2x +1)MOD 17

I am unsure what numbers to assign the letters as we are using MOD17 and not MOD 26?

if I use the usual a=0 b=1 etc I get that t and c are both 5!

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- November 23rd 2011, 10:47 AM #1

- November 23rd 2011, 11:32 AM #2

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## Re: Help using mod

i get that C and T both encrypt to 7. with a mod 17 encryption system, there is no way to avoid some ambiguity, the encryption itself will be unique, but multiple decryptions will exist (whoever receives your message may decipher it as TOMPUCEA).

- November 23rd 2011, 11:46 AM #3