##### Wikipedia

**Transposition cipher**

In cryptography, a **transposition cipher** is a method of encryption by which the positions held by units of plaintext (which are commonly characters or groups of characters) are shifted according to a regular system, so that the ciphertext constitutes a permutation of the plaintext. That is, the order of the units is changed (the plaintext is reordered). Mathematically a bijective function is used on the characters' positions to encrypt and an inverse function to decrypt.

Following are some implementations.

#### Usage examples of "transposition cipher".

In a three-day marathon of cryptanalysis, Manly, aided by Miss Rickert, perceived the pattern of this 12-step official __transposition cipher__, with its multiple horizontal shiftings of three- and four-letter plaintext groups ripped apart by a final vertical transcription.

Normally, one begins by figuring out, based on certain patterns in the ciphertext, whether it is, for example, a substitution or a transposition system, and then further classifying it into, say, an aperiodic __transposition cipher__ in which keying units of constant length encipher plaintext groups of variable length, or vice versa.

Mary, Queen of Scots created a __transposition cipher__ and sent secret communiqué.

Mary, Queen of Scots created a __transposition cipher__ and sent secret communiquÃ©.