📝 docs(_add): guide to generate gpg keys

This commit is contained in:
Eshan Roy
2024-12-05 12:20:26 +05:30
parent 69a7c723a2
commit 613c1fb58e
9 changed files with 208 additions and 32 deletions

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---
sidebar_position: 3
---
# Generate GPG Key
# Generate GPG Key
### 🔐 How to Generate a GPG Key on Snigdha OS
GPG (GNU Privacy Guard) is a tool for secure communication and data encryption. It allows you to create and manage public and private keys, encrypt files, and sign documents. Heres how you can generate a GPG key on Snigdha OS, step by step, with examples.
---
### 🛠️ Step 1: Install GPG
Most Snigdha OS installations come with GPG pre-installed. If its not installed, use the following command to install it:
```bash
sudo pacman -S gnupg
```
To verify the installation, check the version:
```bash
gpg --version
```
---
### 🛠️ Step 2: Create a New GPG Key Pair
1. **Start the key generation process**:
Run the following command:
```bash
gpg --full-generate-key
```
2. **Select the key type**:
Youll see a prompt to choose the type of key. Options typically include:
- **(1) RSA and RSA (default)**
- (2) DSA and Elgamal
- (3) DSA (sign only)
- (4) RSA (sign only)
Press `1` and hit Enter to select the default **RSA and RSA** type.
3. **Set the key length**:
Youll be prompted to specify the key size. A common recommendation is **4096 bits** for strong encryption. Type `4096` and press Enter.
4. **Set the expiration date**:
You can define how long the key should be valid. Options include:
- `0` for no expiration
- Specify a duration, e.g., `1y` for one year, `2y` for two years, or `1m` for one month.
For this example, type `0` (no expiration) and press Enter. When prompted, confirm your choice.
5. **Enter your details**:
Youll be asked for:
- **Your real name**: Enter your full name.
- **Your email address**: Enter a valid email address.
- **A comment (optional)**: Add a description or leave it blank.
Example:
```
Real name: John Doe
Email address: johndoe@example.com
Comment: Snigdha OS User
```
Review the details and confirm by typing `O` (for OK).
6. **Set a passphrase**:
Choose a strong passphrase to protect your private key. This passphrase will be required whenever you use your private key for encryption or signing.
---
### 🛠️ Step 3: Verify the Generated Key
Once the key is generated, you can list your keys with:
```bash
gpg --list-keys
```
Output:
```
/home/username/.gnupg/pubring.kbx
---------------------------------
pub rsa4096 2023-12-05 [SC] [expires: 2025-12-05]
ABCD1234EFGH5678IJKL9012MNOP3456QRST7890
uid [ultimate] John Doe <johndoe@example.com>
sub rsa4096 2023-12-05 [E] [expires: 2025-12-05]
```
- **pub**: Your primary key (for signing and certification).
- **sub**: Subkey (for encryption).
- **[SC]**: Key capabilities: Sign and Certify.
- **[E]**: Encryption.
---
### 🛠️ Step 4: Export Your Public Key
To share your public key with others, export it:
```bash
gpg --armor --export johndoe@example.com > public_key.asc
```
This creates a file `public_key.asc` with your public key in ASCII format.
To display the key in the terminal:
```bash
gpg --armor --export johndoe@example.com
```
---
### 🛠️ Step 5: Test Encryption and Decryption
1. **Encrypt a file**:
Create a sample file to encrypt:
```bash
echo "Hello, this is a test message!" > message.txt
```
Encrypt the file with your public key:
```bash
gpg --output message.txt.gpg --encrypt --recipient johndoe@example.com message.txt
```
This generates an encrypted file `message.txt.gpg`.
2. **Decrypt the file**:
Decrypt the file using your private key:
```bash
gpg --output decrypted_message.txt --decrypt message.txt.gpg
```
Enter your passphrase when prompted. The decrypted content will be saved in `decrypted_message.txt`.
---
### 🛠️ Step 6: Back Up Your Keys
Always back up your keys to prevent losing access:
1. **Export your private key**:
```bash
gpg --armor --export-secret-keys johndoe@example.com > private_key.asc
```
2. **Export your public key**:
```bash
gpg --armor --export johndoe@example.com > public_key.asc
```
3. Store these files (`private_key.asc` and `public_key.asc`) in a safe place.
---
### 🚀 Final Tips
- Keep your private key secure. Never share it.
- Regularly update your passphrase for added security.
- Use tools like **gpg-agent** for easier key management.
Thats it! You now have a functional GPG key pair set up on Snigdha OS. 🎉