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A Level
What travels with a signed note?
Press Sign to seal Alice’s note with her private key. Then press Verify with Alice’s public key. Does the note arrive intact?
ALICE'S NOTETO BAO
Local SHA-256 digestKept at signing
Kept at sender
Alice's private key stays here.
01
Digital signature256 bytes · Alice's private key
RECEIVED NOTE
Claimed sender: Alice
The message and signature arrive; hashing happens here.
Not checked yet
Digest from signature
Local received-message digest
Previous checked result
Real RSA-2048 / PKCS#1 v1.5 with SHA-256 and published fixed demo keys. Named keys are givens. Verification checks these bytes with this key; it does not establish identity, secrecy or truth.