offline - Initial work in developing a simple cheatsheet for using gpg for encryption tasks for offline reference

overlay/etc/skel/Desktop/offline/crypto/gpg-cheatsheet.md

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+---
+title: "GNU Privacy Guard: Crypto Cheetsheet"
+date: 2026-03-19
+updated: 2026-03-19
+author: [The Tech Prepper]
+categories: [cryptography]
+tags: [pgp]
+---
+
+This is an in-progress cheatsheet for performing basic cryptographic
+functions using GNU Privacy Guard (gpg), including encrypting,
+decrypting, and verifying files in an offline environment.
+
+## List Keys
+
+List the current keys on your system.
+
+```
+gpg --list-keys
+```
+
+- `pub` - Primary key
+  - Your identity (root of trust)
+  - Used for signing and certifying other keys
+- `sub` - Subkey
+  - Used for specific operations (usually encryption)
+  - Can be replaced or rotated without changing identity
+  - Can be revoked or rotated if compromised
+- `[SC]` - Sign + Certify
+- `[E]`  - Encrypt
+- Trust levels 
+  - `unknown` - No trust assigned (default)
+  - `full` - you trust this person to sign other keys
+  - `ultimate` - Your own key
+
+```
+gpg --list-secret-keys
+```
+
+## Create Key
+
+```
+gpg --full-generate-key
+```
+
+## Encrypt File
+
+```
+gpg -e -r RECIPIENT file.txt
+```
+
+## Decrypt File
+
+```
+gpg -d file.txt.gpg
+```
+
+## Verify Signature
+
+```
+gpg --verify file.sig file.txt
+```
+
+```
+gpg --verify file.asc
+```