This document summarizes various methods for generating cryptographic keys from biometric traits. It discusses generating keys from fingerprints, iris images, and faces. For fingerprints, minutiae points are extracted from images and used to generate binary strings as keys. For iris images, Scale-Invariant Feature Transform is used to extract features, which are then encrypted using a bio-chaotic algorithm and quantum cryptography to generate keys. Face biometrics employs an entropy-based extraction and Reed-Solomon error correction to generate deterministic bit sequences as keys of suitable length for AES encryption. The document concludes that incorporating biometrics with cryptography provides stronger security by linking keys to users' biometric traits, eliminating the need to store or remember keys separately.