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Security Tools

Inspect security-related data and explore password, certificate, token, and cryptography tools.

Cipher

Playfair Cipher Decoder Decrypt even-length Playfair ciphertext using a 5×5 key square. Output preserves filler letters because removal is ambiguous without context.
Playfair Cipher Encoder Encrypt letters with the classical 5×5 Playfair square, merging J into I and inserting X (or Q after X) between repeated digraph letters. This historical cipher is not secure.

Cryptography

Decode

JWT Decoder Decode a JWT's header and payload from base64url JSON and report the signature bytes; the signature is never verified, so status is always unverified.

Hash

Password

Password Strength Estimate offline-attack strength from character-class pool size and length, never storing or transmitting the secret.

Security

PEM Block Inspector Inspect PEM armored text for block metadata only: BEGIN/END labels, decoded byte counts, and RFC 1421 header line count; no ASN.1 parsing.

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