PGPP
PGPP refers to a public key packaging format associated with the PGP (Pretty Good Privacy) family of cryptographic tools. In many contexts, PGPP denotes the Public Key Package, a legacy container used by some PGP implementations to distribute a public key together with related information such as user IDs and certification signatures. The term is more common in older documentation and in workflows that rely on exporting keys as a single packet-based file with a .pgp extension or similar.
Relation to OpenPGP and modern standards: OpenPGP is the modern, de facto standard for PGP-like cryptography,
Content and structure: A public key in a PGPP-style package generally includes the public key material, version
Usage and security: Public key packages are shared to enable others to encrypt data or verify signatures.
See also: Pretty Good Privacy, OpenPGP, Public-Key Packet, RFC 4880.