Is it recommended to use one AES key for both message authentication and message encryption?

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Is it recommended to use one AES key for both message authentication and message encryption?

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NXP Employee
NXP Employee

Generally, it is a good design to use different keys for different purposes. Typically, one master key is used to derive the other individual keys using defined constants. This scheme prevents the same keys being used for different uses cases and increases robustness.

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