OpenBSD tool to signs and verify signatures on files. Portable version. The signify utility creates and verifies cryptographic signatures. A signature verifies the integrity of a message. The key and signature files created by signify have the same format. The first line of the file is a free form text comment that may be edited, so long as it does not exceed a single line. Signature comments will be generated based on the name of the secret key used for signing. This comment can then be used as a hint for the name of the public key when verifying. The second line of the file is the actual key or signature base64 encoded.