🔐 Cryptography Lab

Plaintext

Shift: 3

Brute Force (all 26 shifts)

Ciphertext

khoor zruog fubswrjudskb

Frequency Analysis

14%

Plaintext Ciphertext

English Letter Freq

E=13% T=9.1% A=8.2% O=7.5% I=7% N=6.7% S=6.3% H=6.1% R=6% D=4.3% L=4% C=2.8% U=2.8%

Cryptography

Caesar shifts each letter by a fixed amount. Vigenere uses a keyword for polyalphabetic substitution. RSA uses the difficulty of factoring large numbers for secure public-key encryption. Hash functions produce fixed-size digests where tiny input changes cause completely different outputs (avalanche effect).

Cryptography Simulator – Encrypt & Decrypt Messages

Cryptography is the practice of designing mathematical algorithms that transform readable data into unreadable ciphertext, protecting information in transit and at rest. This simulator walks you through symmetric algorithms like AES, asymmetric key exchange with Diffie-Hellman, and digital signature schemes, visualizing each step of the encryption and decryption process. You will leave with a concrete understanding of how everyday security—HTTPS, encrypted messaging, and secure storage—actually works under the hood.

What you can do in this simulation

Encrypt and decrypt messages using AES with configurable key sizes
Step through Diffie-Hellman key exchange and see how a shared secret is established
Generate RSA key pairs and use them to sign and verify digital messages
Visualize the XOR operations and round functions inside a block cipher
Compare the security tradeoffs between symmetric and asymmetric schemes

Concepts covered

cryptography · AES encryption · RSA · Diffie-Hellman · digital signatures · public-key cryptography

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Cryptography Simulator – Encrypt & Decrypt Messages

What you can do in this simulation

Encrypt and decrypt messages using AES with configurable key sizes

Step through Diffie-Hellman key exchange and see how a shared secret is established

Generate RSA key pairs and use them to sign and verify digital messages

Visualize the XOR operations and round functions inside a block cipher

Compare the security tradeoffs between symmetric and asymmetric schemes