144 lines
6.0 KiB
HTML
144 lines
6.0 KiB
HTML
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<title>ssh-keygen Cheatsheet - Launch Pad</title>
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<h1 class="blog-page-title">ssh-keygen Cheatsheet</h1>
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<p><a href="index.html">← Back to cheatsheets</a></p>
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<p><a href="../index.html">← Home</a></p>
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<hr>
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<p>ssh-keygen generates, manages, and converts SSH authentication keys. Essential for passwordless SSH access and secure key-based authentication.</p>
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<hr>
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<h2>Key Generation</h2>
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<ul>
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<li>ssh-keygen -t ed25519 - Generate Ed25519 key (recommended)</li>
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</ul>
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<ul>
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<li>ssh-keygen -t rsa -b 4096 - Generate RSA key (4096 bits)</li>
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</ul>
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<ul>
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<li>ssh-keygen -t ecdsa -b 256 - Generate ECDSA key</li>
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</ul>
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<ul>
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<li>ssh-keygen -f ~/.ssh/id_ed25519 - Specify key file location</li>
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</ul>
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<ul>
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<li>ssh-keygen -C "comment" - Add comment to key</li>
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</ul>
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<hr>
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<h2>Key Management</h2>
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<ul>
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<li>ssh-keygen -l -f ~/.ssh/id_ed25519.pub - Show key fingerprint</li>
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</ul>
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<ul>
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<li>ssh-keygen -y -f ~/.ssh/id_ed25519 - Extract public key from private key</li>
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</ul>
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<ul>
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<li>ssh-keygen -p -f ~/.ssh/id_ed25519 - Change passphrase</li>
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</ul>
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<ul>
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<li>ssh-keygen -R hostname - Remove host from known_hosts</li>
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</ul>
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<hr>
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<h2>Key Conversion</h2>
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<ul>
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<li>ssh-keygen -p -m PEM -f old_key - Convert key format</li>
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</ul>
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<ul>
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<li>ssh-keygen -e -f id_rsa.pub -m RFC4716 - Convert to RFC4716 format</li>
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</ul>
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<ul>
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<li>ssh-keygen -i -f publickey - Import key in other formats</li>
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</ul>
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<hr>
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<h2>Common Examples</h2>
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<h3>Generate Ed25519 Key</h3>
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<pre><code>ssh-keygen -t ed25519 -C "your_email@example.com"</code></pre>
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<p>Generate modern Ed25519 key with email comment.</p>
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<h3>Generate RSA Key</h3>
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<pre><code>ssh-keygen -t rsa -b 4096 -f ~/.ssh/id_rsa</code></pre>
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<p>Generate 4096-bit RSA key.</p>
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<h3>Show Fingerprint</h3>
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<pre><code>ssh-keygen -l -f ~/.ssh/id_ed25519.pub</code></pre>
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<p>Display key fingerprint for verification.</p>
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<h3>Change Passphrase</h3>
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<pre><code>ssh-keygen -p -f ~/.ssh/id_ed25519</code></pre>
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<p>Change passphrase on existing key.</p>
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<h3>Copy Public Key</h3>
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<pre><code>cat ~/.ssh/id_ed25519.pub</code></pre>
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<p>Display public key to copy to server.</p>
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<h3>Remove Host Key</h3>
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<pre><code>ssh-keygen -R example.com</code></pre>
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<p>Remove host from known_hosts (after key change).</p>
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<hr>
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<h2>Tips</h2>
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<ul>
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<li>Ed25519 is preferred: smaller, faster, and more secure than RSA</li>
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</ul>
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<ul>
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<li>Use RSA 4096-bit minimum if Ed25519 isn't supported</li>
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</ul>
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<ul>
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<li>Always use passphrases for private keys</li>
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</ul>
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<ul>
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<li>Keep private keys secure (~/.ssh/id_*), never share them</li>
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</ul>
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<ul>
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<li>Public keys (.pub) are safe to share</li>
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</ul>
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<ul>
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<li>Use ssh-copy-id to easily copy keys to servers</li>
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</ul>
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<ul>
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<li>Verify fingerprints out-of-band before trusting new hosts</li>
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</ul>
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