Substitution

Bifid Cipher

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Fractionating Transposition Cipher

The Bifid Cipher is a cryptographic technique that was invented by the French amateur cryptographer Félix Delastelle in 1901. It is a fractionating transposition cipher that combines elements of both substitution and transposition methods.

The Bifid Cipher operates on a square grid known as the Polybius square or Polybius checkerboard. This square consists of a 5x5 grid containing the letters of the alphabet (usually excluding the letter 'J').

The encryption process in the Bifid Cipher involves the following steps:

Atbash

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Substitution Cipher

The Atbash cipher is a substitution cipher that operates by replacing each letter of the alphabet with its respective "opposite" letter. It is one of the simplest and oldest known ciphers.

In the Atbash cipher:

A1Z26

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The A1Z26 cipher, also known as the letter-number cipher or the alphabet cipher, is a simple substitution cipher where each letter of the alphabet is replaced with its corresponding position number.

In the A1Z26 cipher:

The letter "A" is represented by the number "1".
The letter "B" is represented by the number "2".
The letter "C" is represented by the number "3".

And so on, until the letter "Z" is represented by the number "26".

Substitution

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