Cryptography tools
Encrypt, sign, derive keys, generate 2FA codes and explore the classic ciphers — every operation runs in your browser with the Web Crypto API, so keys and data stay yours.
Most popular
AES Encryption
Encrypt and decrypt text with AES-GCM or AES-CBC.
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Cryptographic Key Generator
Random keys, IVs, salts and API tokens from a CSPRNG.
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Enigma Machine Simulator
Operate a full Enigma I — rotors, plugboard, lamp board — and watch each letter travel the wiring.
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JWT Builder & Signer
Build and sign JSON Web Tokens (HS256/384/512).
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Proof-of-Work Mining Simulator
Mine blocks with real SHA-256, tamper with a chain, and see why difficulty and 51% attacks work the way they do.
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RSA Key Pair Generator
Generate 2048/3072/4096-bit RSA keys in PEM format.
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TOTP / HOTP Authenticator
Generate 2FA codes and otpauth:// QR strings.
Symmetric & Keys
AES Encryption
Encrypt and decrypt text with AES-GCM or AES-CBC.
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Cryptographic Key Generator
Random keys, IVs, salts and API tokens from a CSPRNG.
Key Derivation: PBKDF2 & HKDF
Derive keys from passwords (PBKDF2) or key material (HKDF).
Shamir Secret Sharing
Split a secret into n shares; any k of them rebuild it.
Public-Key Cryptography
RSA Key Pair Generator
Generate 2048/3072/4096-bit RSA keys in PEM format.
ECDSA Keys, Sign & Verify
Elliptic-curve key pairs and signatures (P-256/384/521).
Elliptic Curve Visualizer
See curve addition, scalar multiples and a toy ECDH exchange — over the reals and over F_p.
RSA Encrypt & Decrypt
Encrypt with a public key, decrypt with the private key.
RSA Sign & Verify
Sign a message with RSA-PSS and verify the signature.
Tokens & Authentication
Encoding & Bitwise
Classical Ciphers
Enigma Machine Simulator
Operate a full Enigma I — rotors, plugboard, lamp board — and watch each letter travel the wiring.
Caesar Cipher & ROT
Shift-cipher encode/decode with an automatic brute-forcer.
Vigenère Cipher
Keyword polyalphabetic cipher, encode and decode.
Morse Code Translator
Text to Morse and back, with audio playback.
Substitution, Atbash & Affine
Monoalphabetic substitution ciphers with a custom key.
Hashing & Proof-of-Work
About these tools
Cryptography tools from classic to modern: encrypt and decrypt with historical ciphers like Caesar and Vigenère, generate and verify hashes, work with AES and RSA, decode JWTs and explore how digital signatures work. All operations run locally in your browser — keys and plaintext are never transmitted anywhere.