公开(公告)号：US20180316504A1

公开(公告)日：2018-11-01

申请号：US15497419

申请日：2017-04-26

Applicant: NXP B.V.

Inventor： Florian Boehl ,  Simon Johann Friedberger ,  Thierry G.C. Walrant

IPC: H04L9/32 ,  H04L9/06 ,  H04L9/14 ,  H04L29/06

CPC classification number: H04L9/14 ,  H04L9/3242 ,  H04L2209/125

Abstract: A method of computing a message authentication code (MAC) for a message having a common part and an independent part using a constrained processor, including: performing a MAC function on the common part of the message using a first secret key to produce a first output; performing a pseudorandom function on the independent part of the message using a second key to produce a second output, wherein the computation time of the pseudorandom function is significantly less than the computation time of the MAC function; and combining the first output and the second output to produce a computed MAC for the message.