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What it is:
Verification uses the public key to check whether the signature matches the message. What verification tells you:
  • The message is exactly the same as what was signed (no edits)
  • The signature was generated using the matching private key
Try it (demo):
  1. Paste the original message
  2. Paste the signature from the signing step
  3. Paste the public key
  4. Verify signature
  5. Then modify one character of the message and verify again (it should fail)
Link: https://diveshfx.github.io/online-tools/rsa/verify/ or https://tiny.cc/rsaverify