|The GNU Project
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What is a KBX file?
A KBX file is a keybox created by GNU Privacy Guard (GnuPG). It contains one or more OpenPGP public keys and/or X.509 certificates. It also contains associated metadata.
GnuPG is a free alternative to Symantec's Pretty Good Privacy (PGP) software. It allows users to encrypt and decrypt emails, texts, directories, and other files. When encrypting and decrypting files, GnPG uses a variety of public and private security keys. A user's public keys are saved in a KBX file.
Typically, a user's KBX file is named pubring.kbx and stored in their .gnupg directory. Users can import a KBX file into other OpenPGP-compliant software, such as OpePGP.js, to use the public keys and certificates it contains with that software.
Common KBX Filenames
Pubring.kbx - The default KBX file used by GnuPG. It is stored in the .gnupg directory.
How to open a KBX file
KBX files are not meant to be opened. You can use GnuPG's kbxutil to view information about a KBX file. For more information, refer to GnuPG's kbxutil documentation.