1. The document proposes using genetic algorithms and image or sound processing to generate cryptographic keys for authenticating patient data in body area networks.
2. An image is represented as a 2D array of pixel intensities and can be used as a cryptographic key. Sound can also be converted to a matrix for key generation.
3. A genetic algorithm uses selection, crossover and mutation operators on a key population to generate complex keys for encrypting data. Keys are improved over generations for increased security.