Cryptography20795 marksNumerical: Playfair cipher decryptionSubstitution Techniques
The message “IMOGUN” was encrypted with a Playfair cipher using keyword “GALOIS”. Decrypt the message.
The message “IMOGUN” was encrypted with a Playfair cipher using keyword “GALOIS”. Decrypt the message. [5]
- Ciphertext: IMOGUN - Keyword: GALOIS - Convention: I/J combined into a single cell. Keyword unique letters: G, A, L, O, I, S. Then fill remaining alphabet (I/J shared, skip already-used letters): Remaining after G,A,L,O,I,S: B, C, D, E, F, H, K, M, N, P, Q, R, T, U, V, W, X, Y, Z C1 C2 C3 C4 C5...