adding GPG_Cheatsheet.md

GPG_Cheatsheet.md

@@ -0,0 +1,143 @@
+
+## GPG cheatsheet
+
+### Key Management
+
+- **Generate a new GPG key pair:**
+
+\`\`\`bash
+gpg --full-generate-key
+\`\`\`
+
+- **List all keys in your GPG keyring:**
+
+\`\`\`bash
+gpg --list-keys
+\`\`\`
+
+- **List all the secret keys in your GPG keyring:**
+
+\`\`\`bash
+gpg --list-secret-keys
+\`\`\`
+
+# Message Encryption and Decryption
+
+- **Encrypt a message:**
+
+\`\`\`bash
+gpg -e -u "your-email@example.com" -r "recipient@example.com" message.txt
+This creates message.txt.gpg.
+\`\`\`
+
+- **Decrypt a message:**
+
+\`\`\`bash
+gpg -o decrypted-message.txt -d message.txt.gpg
+\`\`\`
+
+- This creates `decrypted-message.txt`.
+
+# GPG Folder Encryption Cheat Sheet
+
+## Encrypting a Folder
+
+1. **Create a tarball from the folder you want to encrypt:**
+
+    Replace **`/path/to/folder_to_encrypt`** with the path to your folder and **`archive.tar.gz`** with the desired name for your tarball.
+
+    \`\`\`bash
+    tar -czvf archive.tar.gz /path/to/folder_to_encrypt
+    \`\`\`
+
+2. **Encrypt the tarball using GPG:**
+
+    Replace **`your-email@example.com`** with your email and **`archive.tar.gz`** with your tarball's name. This will create an encrypted file named **`archive.tar.gz.gpg`**.
+
+    \`\`\`bash
+    gpg -e -r your-email@example.com archive.tar.gz
+    \`\`\`
+
+## Decrypting a Folder
+
+1. **Decrypt the GPG file to a tarball:**
+
+    This will decrypt the **`archive.tar.gz.gpg`** file back to **`archive.tar.gz`**.
+
+    \`\`\`bash
+    gpg -o archive.tar.gz -d archive.tar.gz.gpg
+    \`\`\`
+
+2. **Extract the tarball to the original folder:**
+
+    This will extract the contents of the tarball to the current directory.
+
+    \`\`\`bash
+    tar -xzvf archive.tar.gz
+    \`\`\`
+
+Please note that the person performing the decryption and extraction will need the GPG private key that corresponds to the public key used to encrypt the file.
+
+# Encrypting a message for yourself: [Different Method]
+
+1. **Generate a Key Pair**: If you haven't already, you'll need to generate a GPG key pair. You can do this with the **`-gen-key`** option:
+
+    \`\`\`bash
+    gpg --gen-key
+    \`\`\`
+
+    Follow the prompts to set your name, email address, and passphrase.
+
+2. **Encrypt the Message**: You can now encrypt a message with your public key. For example, to encrypt a message in a file named **`message.txt`**, you can use the following command:
+
+    \`\`\`bash
+    gpg -e -u "Your Name" -r "Your Name" message.txt
+    \`\`\`
+
+    Replace "Your Name" with the name you used when generating your key pair. This will create an encrypted file named **`message.txt.gpg`**.
+
+3. **Decrypt the Message**: To decrypt the message, you can use the **`gpg`** command with the **`d`** option:
+
+    \`\`\`bash
+    gpg -d message.txt.gpg
+    \`\`\`
+
+    You'll be asked for the passphrase you used when generating your key pair.
+
+# Encrypting a message for someone else:
+
+1. **Import Their Public Key**: Before you can encrypt a message for someone else, you'll need their GPG public key. Once you have it, you can import it with the **`-import`** option:
+
+    \`\`\`bash
+    gpg --import theirkey.gpg
+    \`\`\`
+
+    Replace "theirkey.gpg" with the filename of their public key.
+
+2. **Encrypt the Message**: You can now encrypt a message with their public key. For example, to encrypt a message in a file named **`message.txt`**, you can use the following command:
+
+    \`\`\`bash
+    gpg -e -u "Your Name" -r "Their Name" message.txt
+    \`\`\`
+
+    Replace "Your Name" with your name and "Their Name" with the name associated with their public key. This will create an encrypted file named **`message.txt.gpg`**.
+
+The recipient will then be able to decrypt the message using their private key.
+
+# Exporting & Importing Keys
+
+**Exporting Your Public Key:**
+
+1. List your keys to find the one you want to export:
+
+    \`\`\`bash
+    gpg --list-keys
+    \`\`\`
+
+2. Once you've identified the key you want to export (it's usually your email address or name), use the **`-export`** option with the **`a`** (armor) flag to export it to a file:
+
+    \`\`\`bash
+    gpg --export -a "Your Name" > public.key
+    \`\`\`
+
+    Replace "Your Name" with the name or email associated with the key you want to export. This will create a file named **`public.key`** containing your public key.