Sign a message
message = Important documentprivateKey = {"kty":"RSA","n":"...","d":"..."}
Result: Base64-encoded signature.
RSA-PSS Signature
Sign a message using RSA-PSS with SHA-256 and a 32-byte salt. Paste your private key (JWK format) and the message to sign.
Privacy: this tool processes your data entirely in your browser. Nothing you paste or type is sent to the server.
Enter your values and press Calculate — the result appears here.
Worked examples
Frequently asked questions
What is RSA-PSS?
RSA-PSS (Probabilistic Signature Scheme) is a cryptographic signature scheme that provides provable security. It uses a random salt for each signature, making it more secure than older schemes like PKCS#1 v1.5.
What is the salt for?
The salt adds randomness to the signature process, providing provable security and preventing certain attacks.
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