Originally built in 2023 as a learning exercise. Uploaded in 2025 for portfolio visibility. The code reflects the practices and scope from that period. Goal: Implement simple classical ciphers (Caesar ...

This project encrypts a Kiswahili text paragraph using multiple substitution ciphers: Caesar, Atbash, Monoalphabetic, Vigenère, Playfair, and Affine. Each encryption method uses a unique key or grid, ...

The message is called the plaintext because it is the unchanged source information. Example: The cat ran away. The secret message generated is called a cipher or ciphertext and it is the encrypted ...

Abstract: For simple substitution ciphers an exact expression and bounds are derived for the message equivocation in terms of the key equivocation. It is established that the message equivocation ...

Abstract: In this paper, we investigate the use of ant colony optimization (ACO) for automated cryptanalysis of classical simple substitution ciphers. Based on our experiments, ACO-based attacks ...

Introduction to ciphers and substitution. Alice and Bob and Carl and Julius: terminology and Caesar Cipher ; The key to the matter: generalizing the Caesar Cipher ; Multiplicative ciphers ; Affine ...

NOVA scienceNOW's "Can Science Stop Crime" introduced you to Tadayoshi Kohno, a University of Washington computer scientist who's made it his mission to take over networked machines, identifying ...

In this paper we provide a novel approach for breaking a significant class of block ciphers, the so-called SPN ciphers, using the process of gene assembly in ciliates. Our proposed scheme utilizes, ...