# Is there a name for encrypting a decimal number using a one time pad?

I asked a question somewhere else on stack exchange and had to put something like "using the numerical one time pad the user can create their encrypted message by hand". Is there a better way of saying "numerical one time pad"?

The following is an example of what I'm trying to describe:
key: 7 1 6 3 1 3
message: 0 5 0 9 9 9
ciphertext = (message + key) mod 10: 7 6 6 2 0 2

Most OTP examples use mod 26, and most computer programs use mod 2 (XOR), but I'm trying to describe encrypting a decimal number specifically.

• Xor is lighting fast. Is there any advantage for using decimal number? – Leo.W Feb 24 '17 at 10:49
• "decimal-based OTP"? – SEJPM Feb 24 '17 at 10:55
• @DY.W an XOR function is likely faster for computers but this is for a human to write out by hand. The advantage is a human can do this quickly without converting to binary and converting back, since they have been trained to do math in base 10 already. – daniel Feb 24 '17 at 11:18
• @SEJPM "decimal one-time-pad" - as not to confuse it with "(decimal) one-time-password"? – Maarten Bodewes Feb 24 '17 at 14:28
• "Addition modulo 10", maybe... – poncho Feb 24 '17 at 17:26