Danni-Tech

Making the Complicated Simple

Security Plus PKI - KEY EXCHANGE ALGORITHMS

  • Key Points from This Video on Key Exchange Algorithms:

  • Introduction to Key Exchange Algorithms:

    • Key exchange algorithms allow two parties to securely share encryption keys over an untrusted network.
    • For the Security+ exam, a broad understanding of these algorithms is sufficient.

    • RSA (Rivest, Shamir, Adleman):

      • Named after its creators: Rivest, Shamir, and Adleman.
      • Most common asymmetric encryption algorithm in use today.
      • How it works:
        • RSA creates a pair of commutative keys (public and private key pair).
        • You can encrypt with one key and decrypt with the other, enabling secure key exchange between two parties.
      • Recommended key size: 2048 bits.
      • Tip: If RSA feels unfamiliar, review the lessons on public and private keys and asymmetric encryption.

    • Diffie-Hellman:

      • An asymmetric encryption algorithm designed for secure key exchange.
      • Purpose: Allows two parties to establish a shared secret over an unsecured medium.
      • Example (John and Susie):
        • John and Susie exchange public values using Diffie-Hellman.
        • They each combine these with their private values (which are kept secret).
        • This process results in a shared secret, which is used to generate symmetric keys for secure communication.

    • Key Takeaways:

      1. RSA is commonly used for secure key exchange using public/private key pairs.
      2. Diffie-Hellman enables two parties to establish a shared secret for generating symmetric keys.
      3. Both algorithms are essential for secure communications over untrusted networks