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Quantum crypto,lattice based crypto, Neurocryptography and cellular automata based cryptography are alternatives to number theory based crypto. I need to know what are the other hard problems like Lattice problems and Number theory based problems that can be used for cryptography(For asymmetric crypto).

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closed as too broad by e-sushi, AFS, Gilles, DrLecter, rath Apr 7 '14 at 4:11

There are either too many possible answers, or good answers would be too long for this format. Please add details to narrow the answer set or to isolate an issue that can be answered in a few paragraphs.If this question can be reworded to fit the rules in the help center, please edit the question.

Are you talking about asymmetric encryption, or symmetric encryption? For symmetric operations almost nobody number theory based crypto. – CodesInChaos Apr 4 '14 at 9:02
@CodesInChaos I am talking about asymmetric crypto – deltaaruna Apr 4 '14 at 9:27

Code based cryptography like McEliece cryptosystem, is based on the hard problem of decoding linear codes. But i think it lies to the group of quantum based crypto since as far as we know it is still immune to quantum attacks

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