topic Is it recommended to use one AES key for both message authentication and message encryption? in Secure Authentication https://community.nxp.com/t5/Secure-Authentication/Is-it-recommended-to-use-one-AES-key-for-both-message/m-p/980803#M139 <HTML><HEAD></HEAD><BODY><P style="margin-left: .25in;"><SPAN style="font-size: 10.0pt;">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.</SPAN></P></BODY></HTML> Tue, 29 Oct 2019 14:22:19 GMT jordijofrenxp 2019-10-29T14:22:19Z Is it recommended to use one AES key for both message authentication and message encryption? https://community.nxp.com/t5/Secure-Authentication/Is-it-recommended-to-use-one-AES-key-for-both-message/m-p/980803#M139 <HTML><HEAD></HEAD><BODY><P style="margin-left: .25in;"><SPAN style="font-size: 10.0pt;">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.</SPAN></P></BODY></HTML> Tue, 29 Oct 2019 14:22:19 GMT https://community.nxp.com/t5/Secure-Authentication/Is-it-recommended-to-use-one-AES-key-for-both-message/m-p/980803#M139 jordijofrenxp 2019-10-29T14:22:19Z