Digital signatures
Sign a file with your private key (ECDSA P-256). Anyone with your public key can check that the file came from you and has not changed since.
Key pair
No key pair loaded. Create a new one or import a saved one.
You may hand this text out freely. Compare the fingerprint over a second channel (for example by phone) so nobody can slip you a fake key.
Fingerprint:
Export private key (password-protected)
The private key is exported encrypted only (Argon2id, AES-256-GCM). Whoever has it and knows the password can decrypt for you or sign in your name. Otherwise the key pair exists only while this page is open.
Import private key
Sign a file
Verify a signature
Without your own key the tool only checks that file and signature match the key shipped inside the signature. That does not prove who signed – compare the fingerprint with the one you know from the sender.