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Shift Cipher

Tool for automatic Shift Cipher that consists in replacing a letter by another one in the alphabet using a shifting system, a basic or complex sequence of numbers.

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Shift Cipher -

Tag(s) : Substitution Cipher

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Shift Cipher

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Successive Shifts Decoder




Shift type to apply







Change of shift





Successive Shifts Encoder




Shift type to apply






Change of shift




Tool for automatic Shift Cipher that consists in replacing a letter by another one in the alphabet using a shifting system, a basic or complex sequence of numbers.

Answers to Questions

How to encrypt using Shift cipher?

The shift cipher encryption uses an alphabet and shifts the position of its letters.

A letter in position $ N $ in the alphabet, can be shifted by $ X $ into the letter located at position $ N+X $ (This is equivalent to using a substitution with a shifted alphabet).

Example: Take the letter E in position 5 in the alphabet ABCDEFGHIJKLMNOPQRSTUVWXYZ, it will be encrypted by a shift of 3 in position 8 or H.

If the shifted position exceeds the number of letters in the alphabet, then take it at the beginning (consider the alphabet as cyclical)

Example: Z shifted by 1 gives A.

It is thus possible to define different type of shifts, some shifts correspond to known encryption algorithms:

A single shift (all letters are shifted by the same value) is called Caesar Code.

A multiple shift, according to a sequence or a key that is repeated (the letters are shifted from each of the key values), it is called Vigenere Cipher.

A mathematical shift, the easiest way is to progressively shift the nth letter of the value n is the Trithemus Cipher or if the shift is more complex Affine Cipher or even Hill Cipher.

How to decrypt using Shift cipher?

Decryption requires knowing the shift used and the alphabet.

Take a letter in position N in the alphabet that has been encrypted by a shift of X, it must be shifted by -X to return to its original position N-X.

Example: The letter H in position 8 in the alphabet ABCDEFGHIJKLMNOPQRSTUVWXYZ, will be decrypted from a shift of 3 in position 8-3=5 or E.

Example: The word TIJGU is decoded with an offset of 1 as SHIFT

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