It's a little pricey (I think it's meant as a textbook), but DJB has a book on post-quantum cryptography‡ He also has an intro paper (which is probably more al

It's a little pricey (I think it's meant as a textbook), but DJB has a book on post-quantum cryptography‡ He also has an intro paper (which is probably more along the lines of what you're looking for)‡ Hash-based cryptography, code-based cryptography, lattice-based cryptography, and multivariate-quadratic-equations cryptography are all methods that should hold up in a post-quantum world. RSA will be screwed though. ‡ http://www.amazon.com/Post-Quantum-Cryptography-Daniel-J-Bernstein/dp/3642100198/ref=sr_1_1?ie=UTF8&qid=1341593867&sr=8-1&keywords=post+quantum+cryptography http://www.amazon.com/Post-Quantum-Cryptography-Daniel-J-Ber... ‡ http://www.pqcrypto.org/www.springer.com/cda/content/document/cda_downloaddocument/9783540887010-c1.pdf http://www.pqcrypto.org/www.springer.com/cda/content/documen...