Security & Encoding

Hashes, encryption, passwords and keys.

73 tools

ADFGVX Cipher WWI German cipher: 6×6 Polybius substitution + columnar transposition.
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Adler-32 Checksum Compute the Adler-32 checksum used by zlib / PNG.
AES Encryptor / Decryptor Encrypt or decrypt text with AES-256-GCM and a passphrase.
AES-CBC / AES-ECB Encryptor Encrypt or decrypt with AES-256 in CBC or (educational) ECB mode using a passphrase.
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Affine Cipher Substitution cipher y = (ax + b) mod 26 with a coprime to 26.
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Apache htdigest Entry Generate an MD5 entry for an Apache .htdigest file.
Argon2 Hash Generator Generate Argon2id password hashes with configurable parameters.
Base32 (RFC 4648) Encoder / Decoder Encode and decode standard RFC 4648 Base32 with padding.
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Base58 Encoder / Decoder Encode and decode Bitcoin-style Base58.
Base62 Encoder / Decoder Encode and decode Base62 (URL-safe alphanumeric).
Base85 / Ascii85 Encoder Encode bytes to Base85 (Ascii85) and decode them back.
basE91 Encoder / Decoder Compact basE91 binary-to-text encoding (~14% denser than Base64).
Bcrypt Hash Generator Hash a password with Bcrypt or verify a hash.
Beaufort Cipher Reciprocal Vigenère variant: encrypt and decrypt are identical.
Bifid Cipher Polybius-based fractionating cipher (5×5 grid).
BIP-39 Mnemonic Generate or verify a BIP-39 seed phrase.
BLAKE2b Hasher Compute BLAKE2b cryptographic hashes (RFC 7693).
Caesar Box Cipher Encrypt by writing text into a square and reading down the columns.
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ChaCha20-Poly1305 Encryptor Encrypt or decrypt text with ChaCha20-Poly1305 AEAD and a passphrase.
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Cipher Identifier & Caesar Brute-Force Estimate the cipher type from letter statistics and list all 25 Caesar shifts.
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Columnar Transposition Cipher Encrypt text with a keyword-driven columnar transposition.
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CRC-16 / CRC-32 Calculator Compute CRC-16-CCITT and CRC-32 (IEEE 802.3) checksums.
CSP Builder & Linter Build a Content Security Policy from checkboxes or lint an existing CSP for foot-guns.
Diceware Passphrase Generate memorable Diceware passphrases.
Diffie–Hellman Key Exchange Demo Walk through a Diffie–Hellman exchange and confirm both sides derive the same secret.
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Ed25519 Key Generator Generate an Ed25519 key pair — raw hex, PEM and OpenSSH formats.
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Enigma Machine Simulator Simulate a 3-rotor Enigma (I-II-III, reflector B) — symmetric encrypt/decrypt.
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Four-Square Cipher Two-keyword digraph substitution over four 5×5 squares.
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HIBP k-Anonymity Prefix Hash a password with SHA-1 and show the 5-char prefix for the HIBP range API.
Hill Cipher (2×2) Matrix-based classical cipher with a 2×2 key matrix mod 26.
HKDF Key Deriver Derive keys from high-entropy material using HKDF.
HMAC Generator Compute keyed HMAC signatures (SHA-1, SHA-256, SHA-384, SHA-512).
JWT Generator Build a signed-token preview from JSON header and payload data.
MD5 Hash Generator Compute the MD5 hash of any text.
Multi-Decoder Pipeline Chain base64, gzip, url and hex transforms in a single pass.
NTLM Hash Generator Compute the NTLM (MD4 over UTF-16LE) hash of a password.
OIDC ID Token Decoder Decode an OpenID Connect ID token and pretty-print its claims.
One-Time Pad Generate or apply a one-time pad — XOR with a random key.
otpauth:// URI Builder Build an otpauth:// URI from issuer, account and Base32 secret.
Password Generator Generate strong, cryptographically-random passwords.
Password Policy Tester Check a password against a configurable length/character-class policy.
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Password Strength Checker Estimate password entropy and strength in real time.
PBKDF2 Key Deriver Derive a key from a password using PBKDF2.
PEM ↔ DER Converter Convert between PEM (base64) and DER (binary/hex) for X.509 and keys.
PGP Encrypt / Decrypt Work with armored PGP-style text payloads in-browser.
PGP Fingerprint Formatter Group a hex PGP fingerprint into the standard 4-/20-char layout.
Playfair Cipher Classic 5×5 digraph substitution cipher.
Polybius Square Cipher Substitute each letter with its row + column digits on a 5×5 grid.
Public Suffix Lookup Find the registrable domain for any hostname using a built-in suffix list.
QR Code Scanner / Decoder Decode QR code images back to text.
Quoted-Printable Encoder / Decoder Encode and decode MIME Quoted-Printable.
ROT13 / Caesar Cipher Encode or decode ROT13 and simple Caesar-shift text.
ROT47 Cipher Reciprocal cipher over the printable ASCII range (33–126).
RSA Key Pair Generator Generate a fresh RSA public + private key pair (PEM).
SAML Assertion Inspector Decode and inspect a SAML 2.0 Response — raw XML, base64, or base64+deflated.
SAML Response Decoder Base64-decode, inflate and pretty-print a SAML request or response.
Scytale Cipher Ancient transposition cipher — wrap text around a rod of N rows.
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Self-Signed Certificate Generate a self-signed X.509 RSA certificate (PEM) for dev / staging.
SHA Hash Generator Compute SHA-1, SHA-256, SHA-384 and SHA-512 hashes of any text.
SHA-3 Hasher Compute SHA3-256, SHA3-384 and SHA3-512 hashes.
Shamir Secret Sharing Split a secret into N shares with a K-of-N threshold.
SSH Key Generator Generate RSA or Ed25519 SSH key material for testing.
SSH Key Inspector Inspect any OpenSSH or PEM key — type, bit length, MD5 + SHA-256 fingerprints.
SSH known_hosts Parser Parse known_hosts entries: host pattern, key type and SHA-256 fingerprint.
SSL Certificate Decoder Paste a PEM-encoded SSL certificate to inspect its fields.
Subresource Integrity Hash Generate a sha256/384/512-prefixed SRI hash for a file or text.
Tap Code Prisoner-of-war 5×5 tap-pair encoder (K shares C's cell).
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TOTP Code Generator Generate a Time-based One-Time Password (RFC 6238) — SHA-1, SHA-256 or SHA-512.
Trifid Cipher Fractionating cipher over a 3×3×3 cube (26 letters + '+').
UUID to Bytes Converter Convert UUID values to byte-array notation.
Vigenère Key-Length Estimator Estimate the key length of a Vigenère ciphertext via Index of Coincidence.
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WireGuard Key Generator Generate a Curve25519 private/public/preshared key triplet for a WireGuard tunnel.
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XOR Cipher Apply a repeating-key XOR to text or bytes.