all the realable uncomplex algorithm of cryptography are asymetric and use the fact that the PGCD of a number have an asymetric solution.

You can check the Fuzzy Vault Scheme. It is is an encryption scheme over the biometric data proposed by Juels and Sudan. It exploits some of the concepts of error-correcting codes, to encode information obtained from biometric-based characteristic.

Try to explore the research paper enclosed below.

http://link.springer.com/article/10.1007/s10623-005-6343-z

Bio-hashing and cancellable biometric approach can help in some extend