Classical Cryptography Simulator

Module 3: Asymmetric Key Cryptography

Explore the mathematical foundations of public key cryptography. Learn about primes, factorization, modular arithmetic, and fundamental theorems that secure modern encryption.

Module 4: Authentication & Message Integrity

Explore authentication mechanisms, security requirements, and message authentication codes. Learn how to verify identity and ensure message integrity in cryptographic systems.

Classical Cryptography Simulator

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Shift-based substitution cipher. Each letter is replaced by a letter a fixed number of positions down the alphabet.

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Monoalphabetic Cipher

Each letter maps to a unique substitute letter using a randomized alphabet mapping.

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Playfair Cipher

Digraph substitution cipher using a 5×5 key matrix. Encrypts pairs of letters.

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Polygraphic substitution cipher using matrix multiplication. Encrypts character pairs using 2×2 key matrix.

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Polyalphabetic Cipher

Vigenère cipher using a repeating keyword to create multiple shift values. More secure than Caesar cipher.

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Rail Fence Cipher

Transposition cipher that writes plaintext in a zigzag pattern across multiple rails.

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Columnar Transposition

Rearranges plaintext by writing it in rows and reading columns in a key-specified order.

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Conceptual demonstration of hiding secret messages within cover data.

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Demonstrates block cipher encryption using substitution and permutation operations on fixed-size blocks.

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Confusion & Diffusion

Fundamental cryptographic principles: confusion obscures plaintext relationships, diffusion spreads statistics across ciphertext.

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RC4 Stream Cipher

Pseudorandom number generator based stream cipher. Uses Key Scheduling Algorithm (KSA) and Pseudorandom Generation Algorithm (PRGA).

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DES (Data Encryption Standard)

Symmetric-key block cipher with 16 Feistel rounds. Demonstrates permutation, substitution, key scheduling, and S-box transformations.

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AES (Advanced Encryption Standard)

Modern symmetric encryption standard. Supports 128, 192, and 256-bit keys with SubBytes, ShiftRows, MixColumns, and AddRoundKey transformations.

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Security Concepts

Network Security Model

Understanding the network security model with sender, recipient, trusted third party, and opponent roles in secure communication.

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Mathematical Tools

Calculate Greatest Common Divisor using the Euclidean algorithm with step-by-step visualization. Essential for understanding number theory in cryptography.

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