The value of dn is negative, so 26 will be added to it. Like, the third letter of the ciphertext. Note: If any case (D n) value becomes negative (-ve), in this case, we will add 26 in the negative value.
Caeser cipher mod#
The encrypted message of this plain text is "WTAAD".ĭ n (x) = (xi - n) mod 26 Ciphertext: W → 22 Note that the Caesar cipher is monoalphabetic, so the same plaintext letters are encrypted as the same letters. Ciphertext: M → 12Įxample: 2 Use the Caesar cipher to encrypt and decrypt the message "HELLO," and the key (shift) value of this message is 15.Į n (x) = (x + n) mod 26 Plaintext: H → 07 If any case (D n) value becomes negative (-ve), in this case, we will add 26 in the negative value. We apply decryption formulas by character, based on alphabetical order. For example, "JAVATPOINT" has "A", encrypted by "D". We apply encryption formulas by character, based on alphabetical order.Į n (x) = (x + n) mod 26 Plaintext: J → 09 Plaintext: It is a simple message written by the user.Ĭiphertext: It is an encrypted message after applying some technique.Įxample: 1 Use the Caesar cipher to encrypt and decrypt the message "JAVATPOINT," and the key (shift) value of this message is 3. It means the message encrypted by this method can be easily decrypted. Let's take an example to understand the Caesar cipher, suppose we are shifting with 1, then A will be replaced by B, B will be replaced by C, C will be replaced by D, D will be replaced by C, and this process continues until the entire plain text is finished.Ĭaesar ciphers is a weak method of cryptography. The Caesar cipher is a kind of replacement (substitution) cipher, where all letter of plain text is replaced by another letter. For this reason, the shift cipher technique is called the Caesar cipher. Julius Caesar used the shift cipher (additive cipher) technique to communicate with his officers.
The Caesar cipher method is based on a mono-alphabetic cipher and is also called a shift cipher or additive cipher. The Caesar cipher is the simplest and oldest method of cryptography.
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