# Thread: Ye Nomenclature of Ceaser Ciphers

1. ## Ye Nomenclature of Ceaser Ciphers

Hey all-

I'm spending a lot of time confusing myself, so maybe someone could clear the air for me.

How do you name a Ceaser Cipher?

Say I know that the cipher will look like this:

Code:
A.B.C.D.E.F.G.H.I.J.K.L.M.N.O.P.Q.R.S.T.U.V.W.X.Y.Z
W.X.Y.Z.A.B.C.D.E.F.G.H.I.J.K.L.M.N.O.P.Q.R.S.T.U.V
Have I just created a +5 cipher, because the A is in the 5th spot?
Or is it a +4 cipher?

So confused!
moscow

2. I would call it -4 because you are going "backwards" in the alphabet (or +22)

3. Caesar shifts are commonly designated by the amount you shift or rotate the letters. The nomenclature is ROT X, where X is the shift "to the right".
For example, in ROT 3 you shift "A" over three spots to the "D" position.
Code:
Plain :  abcdefghijklmnopqrstuvwxyz
ROT 0 :  ABCDEFGHIJKLMNOPQRSTUVWXYZ
ROT 1 :  BCDEFGHIJKLMNOPQRSTUVWXYZA
ROT 2 :  CDEFGHIJKLMNOPQRSTUVWXYZAB
ROT 3 :  DEFGHIJKLMNOPQRSTUVWXYZABC
ROT 4 :  EFGHIJKLMNOPQRSTUVWXYZABCD
ROT 5 :  FGHIJKLMNOPQRSTUVWXYZABCDE
ROT 6 :  GHIJKLMNOPQRSTUVWXYZABCDEF
ROT 7 :  HIJKLMNOPQRSTUVWXYZABCDEFG
ROT 8 :  IJKLMNOPQRSTUVWXYZABCDEFGH
ROT 9 :  JKLMNOPQRSTUVWXYZABCDEFGHI
ROT 10 : KLMNOPQRSTUVWXYZABCDEFGHIJ
ROT 11 : LMNOPQRSTUVWXYZABCDEFGHIJK
ROT 12 : MNOPQRSTUVWXYZABCDEFGHIJKL
ROT 13 : NOPQRSTUVWXYZABCDEFGHIJKLM
ROT 14 : OPQRSTUVWXYZABCDEFGHIJKLMN
ROT 15 : PQRSTUVWXYZABCDEFGHIJKLMNO
ROT 16 : QRSTUVWXYZABCDEFGHIJKLMNOP
ROT 17 : RSTUVWXYZABCDEFGHIJKLMNOPQ
ROT 18 : STUVWXYZABCDEFGHIJKLMNOPQR
ROT 19 : TUVWXYZABCDEFGHIJKLMNOPQRS
ROT 20 : UVWXYZABCDEFGHIJKLMNOPQRST
ROT 21 : VWXYZABCDEFGHIJKLMNOPQRSTU
ROT 22 : WXYZABCDEFGHIJKLMNOPQRSTUV
ROT 23 : XYZABCDEFGHIJKLMNOPQRSTUVW
ROT 24 : YZABCDEFGHIJKLMNOPQRSTUVWX
ROT 25 : ZABCDEFGHIJKLMNOPQRSTUVWXY
A shift of -3 moves "to the left" so, A -> X.

4. Thanks Molnar and Gabi!

Just to clarify...

If I need +5, +6, and +7 ciphers, the following are the ones I should use:

Code:
ROT 5 :  FGHIJKLMNOPQRSTUVWXYZABCDE
ROT 6 :  GHIJKLMNOPQRSTUVWXYZABCDEF
ROT 7 :  HIJKLMNOPQRSTUVWXYZABCDEFG
moscow

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