Digital Signatureis a cryptographic mechanism used to verify the authenticity of digital information. It provides guarantees of data integrity, authentication, and non-repudiation. All operations are performed locally in your browser; your keys and data are never sent to any server.

1. Step 1：Get a Key Pair
   If you don't have a key pair, first select an algorithm, then click theGenerate New Key Pairbutton. The tool will generate a public and a private key for you.。
2. Step 2：Generate Signature
   Paste your private key and the message you want to sign into the corresponding input fields, then click Generate Signature . The generated signature (in Base64 format) will appear in the output box.
3. Step 3：Verify Signature
   To verify a signature, you need three things: the original message, the public key, and the signature itself. Fill them into the corresponding input fields, then click Verify Signature . The status bar will show the verification result.