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thetechprepper
89 lines
1.6 KiB
Markdown
89 lines
1.6 KiB
Markdown
---
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title: "GNU Privacy Guard: Crypto Cheetsheet"
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date: 2026-03-19
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updated: 2026-03-19
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author: [The Tech Prepper]
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categories: [cryptography]
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tags: [pgp]
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copyright: "(C) 2026 The Tech Prepper, LLC"
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---
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This is an in-progress cheatsheet for performing basic cryptographic
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functions using GNU Privacy Guard (gpg), including encrypting,
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decrypting, and verifying files in an offline environment.
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## List Keys
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List the current keys on your system.
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```
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gpg --list-keys
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```
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- `pub` - Primary key
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- Your identity (root of trust)
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- Used for signing and certifying other keys
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- `sub` - Subkey
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- Used for specific operations (usually encryption)
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- Can be replaced or rotated without changing identity
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- Can be revoked or rotated if compromised
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- `[SC]` - Sign + Certify
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- `[E]` - Encrypt
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- `unknown|full|ultimate` - See "Set Trust Levels"
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```
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gpg --list-secret-keys
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```
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## Create Key
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```
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gpg --full-generate-key
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```
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## Encrypt File
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```
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gpg -e -r RECIPIENT file.txt
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```
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## Decrypt File
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```
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gpg -d file.txt.gpg
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```
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## Verify Signature
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```
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gpg --verify file.sig file.txt
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```
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```
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gpg --verify file.asc
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```
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## Set Trust Levels
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Here are common trust levels for basic use:
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- `unknown` - No trust assigned (default)
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- `full` - You trust this person to sign other keys
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- `ultimate` - Your own key
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Perform the following steps to change the trust level for a key.
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1. List the keys and identify the key ID (KEYID).
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gpg --list-keys
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2. Replace `KEYID` with the key ID to edit.
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gpg --edit-key KEYID
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3. Type `trust` and press [ENTER].
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4. Type the number for the desired trust level and press [ENTER].
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5. Type `quit` to exit.
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