Generate a new public private keypair

ssh-keygen

Explore your public and private key

cat ~/.ssh/id_rsa.pub
cat ~/.ssh/id_rsa

• Try adding it to Github so you can push to github without password
• Try adding it to digitalocean and ssh using it.

ssh ubuntu@IP
or
git clone [email protected]:100xdevs-cohort-3/week-24-deposit-with-infra.git (try a private repo)

Check authorized_keys

cat ~/.ssh/authorized_keys

How to hack your friends laptop?

Put your public key in your friends laptop as an authorized key.

Algorithms for public key cryptography

The ssh-keygen tool can generate SSH key pairs using several different cryptographic algorithms, depending on what you choose during the key creation process. By default, it typically uses RSA, but you can specify other algorithms as well. Here are the most commonly used algorithms:

1. RSA (Rivest–Shamir–Adleman)

• Default Algorithm (for most systems): The ssh-keygen tool uses RSA by default when creating keys.
• RSA is a widely-used public-key algorithm that provides strong security.

2. Ed25519

• A newer and more secure option: Ed25519 is a modern elliptic curve algorithm that is designed to provide both high security and efficiency.
• It’s faster, more secure for the same key size, and less prone to certain vulnerabilities compared to RSA.