Cryptographic Algorithm

• Documentation: Report Link

- This report provides the knowledge of cryptography and how encryption and decryption works. In this report, the Ceaser Cipher and Vigenere Cipher Algorithm has been modified to create a new unique algorithm. The newly developed algorithm provides an additional layer of security to the already robust two old cryptographic algorithms.

- This novel cryptographic method involves three stages. It starts with a unique Caesar cipher formula En = (P + K) mod 47, with a key of '77', and a substitution table. Then, an even/odd rule is applied: if the output is even or 0, three is added; if odd, three is subtracted, and the corresponding values are retrieved from the substitution table. Lastly, a modified 48x48 Vigenere table encrypts the message, using the Caesar cipher output as the keyword and the even/odd rule output as the plaintext, creating the final ciphertext. The same process is reversed for the decryption process.