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Symmetric Encrypt & Decrypt

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Symmetric encryption is a type of encryption where the same key is used to both encrypt and decrypt information. It is also called single key encryption or secret key encryption. Symmetric encryption is fast and efficient, but it requires a secure way to share the key between the sender and the receiver. Some examples of symmetric encryption algorithms are AES, DES, RC4. Symmetric encryption is widely used for data protection, authentication and digital signatures.

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XOR Cipher is a type of additive cipher.

XOR Cipher
XOR Cipher is a type of additive cipher.
Columnar Transposition Cipher is a fairly simple, easy to implement cipher. It is a transposition cipher that follows a simple rule for mixing up the characters in the plaintext to form the ciphertext.

Columnar Transposition Cipher
Columnar Transposition Cipher is a fairly simple, easy to implement cipher. It is a transposition cipher that follows a simple rule for mixing up the characters in the plaintext to form the ciphertext.
Porta Cipher is a polyalphabetic substitution cipher invented by Giovanni Battista della Porta. Where the Vigenere cipher is a polyalphabetic cipher with 26 alphabets, the Porta is basically the same except it only uses 13 alphabets. The 13 cipher alphabets it uses are reciprocal, so enciphering is the same as deciphering.

Porta Cipher
Porta Cipher is a polyalphabetic substitution cipher invented by Giovanni Battista della Porta. Where the Vigenere cipher is a polyalphabetic cipher with 26 alphabets, the Porta is basically the same except it only uses 13 alphabets. The 13 cipher alphabets it uses are reciprocal, so enciphering is the same as deciphering.
ROT13 Cipher is a simple letter substitution cipher with a specific key where the letters of the alphabet are offset 13 places.

ROT13 Cipher
ROT13 Cipher is a simple letter substitution cipher with a specific key where the letters of the alphabet are offset 13 places.