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Update README.md (#512)

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@ -218,11 +218,9 @@ Many people have tried to implement encryption schemes that are essentially Vige
###### Source: [Wikipedia](https://en.wikipedia.org/wiki/Vigen%C3%A8re_cipher)
### Transposition
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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).<br>
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The **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).<br>
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Mathematically a bijective function is used on the characters' positions to encrypt and an inverse function to decrypt.
###### Source: [Wikipedia](https://en.wikipedia.org/wiki/Transposition_cipher)