Web Key Directory - Tester

The OpenPGP Web Key Directory is a key discovery scheme that allows you to locate OpenPGP keys using an e-mail address.

OpenPGP defines User IDs (which include e-mail addresses) as UTF-8 strings. To simplify storing these in a file system, implementations first convert all uppercase ASCII characters in the local-part of the address to lowercase (non-ASCII characters remain unchanged). This normalized local-part is then hashed using SHA-1, and the resulting 160-bit digest is encoded with the Z-Base-32 method, producing a fixed-length 32-character string.

Two methods are defined to form the lookup URI:

• Advanced Method: Requires a dedicated openpgpkey sub-domain. The URI is built by concatenating:
  https://openpgpkey.<domain>/.well-known/openpgpkey/<domain>/hu/<32-character-hash>?l=<local-part>
  For example, for Joe.Doe@Example.ORG:
  https://openpgpkey.example.org/.well-known/openpgpkey/example.org/hu/iy9q119eutrkn8s1mk4r39qejnbu3n5q?l=Joe.Doe
• Direct Method: Does not require additional DNS entries. The URI is built by concatenating:
  https://<domain>/.well-known/openpgpkey/hu/<32-character-hash>?l=<local-part>
  For example, for Joe.Doe@Example.ORG:
  https://example.org/.well-known/openpgpkey/hu/iy9q119eutrkn8s1mk4r39qejnbu3n5q?l=Joe.Doe

According to the standard, implementations must first try the Advanced Method. Only if the required sub-domain does not exist should the Direct Method be used. Note that a non-responding server does not automatically trigger a fallback.