Kevin, an encryption specialist, implemented a technique that enhances the security of keys used for encryption and authentication. Using this technique, Kevin input an initial key to an algorithm…

Key stretching is a cryptographic technique that takes a relatively weak key, such as a password, and increases its strength by repeatedly processing it through a hashing function with a salt. This iterative process makes the derived key computationally expensive to crack via brute-force attacks, thereby enhancing its security.

Public key infrastructure (PKI) is a system for managing digital certificates and public/private key pairs to establish trust and authenticate identities, not a method for strengthening a single encryption key against brute-force attacks.

A key derivation function (KDF) is an algorithm that derives one or more secret keys from a secret value, but key stretching is a specific application of a KDF designed to deliberately increase the computational cost of derivation to resist brute-force attacks.

Key reinstallation refers to a vulnerability where an attacker can exploit the reinstallation of cryptographic keys, particularly in Wi-Fi protocols like WPA2, to compromise network security, rather than a technique to enhance key strength.