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Tool to substitution with alphabetical rank with addition. This variant of the alphabetical rank cipher (A=1, B=2, C=3 etc.) adds up the rank value from the current letter to the previous value.

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Tag(s) : Cryptography, Substitution Cipher

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Tool to substitution with alphabetical rank with addition. This variant of the alphabetical rank cipher (A=1, B=2, C=3 etc.) adds up the rank value from the current letter to the previous value.

### How to encrypt using Added Alphabetical Rank cipher?

Encryption consists of adding each number (which represents the position of a letter of the alphabet) to the number preceding it.

Example: ABC (1,2,3) is coded 1,(2+1),(3+(2+1)=6) so 1,3,6

Example: DCODE (4,3,15,4,5) becomes 4,(3+4=7),(15+7=22),(4+22=26),(5+26=31) so 4,7,22,26,31

### How to decrypt Added Alphabetical Rank cipher?

Decryption implies to subtract each number to the one that precedes to obtain new numbers that correspond to a substitution by classical alphabetical ranking.

Example: Consider the message 4,7,22,26,31

Subtract each value to one before (except for the first value).

Example: 4,7-4,22-7,26-22,31-26 gives 4,3,15,4,5

A substitution is carried out according to the rank in the alphabet.

Example: 4 = D, 3 = C, etc. The plain message is DCODE.

If the result of the subtraction is less than zero or greater than the number of letters in the alphabet, then it is possible to perform a modulo operation.

### How to recognize Added Alphabetical Rank ciphertext?

The message is composed of numbers which should mainly be increasing. (Each number must be larger than the previous one). Moreover, the difference between two numbers should ideally be between 1 and 26 (where 26 is the number of letters in the alphabet)