Sign Your Data

Enter your SPHINCS+ private key and the data you want to sign below. You can paste text (up to 1KB) or upload a file (up to 5MB). The tool will automatically detect the variant based on your private key.

Private Key (hexadecimal):

Or upload private key file (max 1KB):

Data to Sign (max 1KB if pasted):

Or upload data file (max 5MB, any type - images, PDFs, etc.):

How to Use This Tool

Use Scenario: Alice wants to sign a document to prove its authenticity. She uses her private key to generate a signature with this tool (generate SPHINCS+ signature). She then shares the document and signature with Bob, who can verify it using Alice's public key with our verification tool.

Security Assurance

Your private key and data are processed in memory and not stored. For details, see our Privacy Policy.