# Tag Info

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CMAC (or OMAC1) is the underlying MAC algorithm that provides authentication and integrity for EAX. Is stated in NIST SP 800-38B: Because CMAC is based on an approved symmetric key block cipher, such as the Advanced Encryption Standard (AES) algorithm that is specified in Federal Information Processing Standard (FIPS) Pub. 197 [3], CMAC can be ...

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OK, here's the node.js module that I wrote based on the swap-or-not algorithm in the papers of the first comment (by Ricky Demer). It requires the Long module. It supports inputs up to 63 bits (there are plenty of algorithms for 64 bits and above). Inputs and outputs should be Long objects. The $K_i$'s are chosen using an aes-256-ctr pseudo-random stream. ...

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You are over-thinking about cryptography. It's not supposed to be that complex. I started with the idea "let make 1 chip have multiple id". And I come up with something relatively simple than what you mentioned so far. (I'm not sure if this usable in your situation or not. It's just based on the info you described.) Prepare: I will make every chip have ...

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