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Private and secret keys consists of secret information used as input to various kinds of cryptographic algorithms such as encryption, signature and MAC to select the concrete transformation done by the algorithm.

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Optimal Key Length for Encryption Protocols Balancing Security and Performance

keys/2^40 used keys = 2^88). … The total amount of target keys is 2^48 keys(2^32 devices*2^16 keys per device). …
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