Key stretching

Key stretching is a cryptographic technique used to increase the security of passwords or keys by making them longer and more complex. It involves applying a computational function repeatedly to a password or key, effectively transforming it into a more secure format. The primary goal of key stretching is to make it more difficult for an attacker to perform brute force attacks or dictionary attacks to recover the original password. The process typically involves the following steps: 1. **Input**: A weak password or key is provided as input.