Understanding GPG Keychain Validity Column Values
This article dives deep into GPG Keychain Version 1.12 (1800) by looking at the "validity" column in the table of keys. GPG Keychain is a part of the GPGTools suite for Mac OS 15.2 (24C101) and above and plays an essential role in securing email communication, file encryption, and digital signatures.
What is GPG Keychain?
GPG Keychain is a graphical user interface (GUI) application that helps users manage their OpenPGP keys. With a streamlined and user-friendly design, GPG Keychain enables users to:
- Create new OpenPGP keys
- Import and export keys
- Edit and delete keys
- Manage key trust levels
Validity column values in the GPG Keychain
The validity of a key in GPG Keychain provides a visual representation of the trust relationship between keys in your keyring. Examining the last column in the table, labeled "validity," will give you information on the following:
Unknown (question mark)
A key marked with a question mark in the validity column means the key's validity is unknown. This could be because the key was just imported, the fingerprint was not verified, or no trust signatures have been associated with the key.
Invalid (exclamation mark)
The exclamation mark indicates that the key is invalid. The reasons could be:
- An expired key
- A revoked key
- A key with a signature that fails verification for some reason.
Marginal (triangle)
The triangle symbol in the validity column implies the key has marginal validity. This is typically due to one or more signatures on the key, but no explicit trust has been declared. This key should be verified through external means.
Full (check mark)
The checkmark symbol signifies the key has full validity. This is the highest assurance level possible and means that:
- The key user has identified themselves.
- Users have verified the key fingerprint.
- The key has received an explicit trust signature.
Establishing trust signatures
To raise the trust level on keys, users must establish trust signatures. Trust signatures indicate that the key belongs to the actual user and provide assurance. There are three levels of trust that can be assigned:
NEVER: This should be used when you don't want to assign any trust to a user.MARGINAL: It might be used for casual acquaintances or when a key has been verified only through electronic methods.FULL: This is for strong relationships, where thorough identification has been confirmed through face-to-face meetings.
gpg --edit-key [KEYID]
gpg> trust
# Choose the level of trust here
gpg> save
Understanding the validity column of GPG Keychain is critical for managing secure communication with OpenPGP keys. Establishing trust signatures and ensuring a key's validity prevents security breaches and provides confidence in the digital signature and encryption process. Becoming familiar with these concepts enhances e
Summary and References:
- GPG Keychain: