Understanding GCMP-256 for Enhanced Security
Learn about GCMP-256, a robust security protocol offering 192-bit encryption strength, surpassing CCMP-128. GCMP-256 is recommended for higher throughput due to its efficient MultH function. Discover insights on MIC calculation, encrypted frame structure, and the implementation of GCMP-256 in wireless communication standards.
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July 2020 doc.: 20/0866r0 GCMP for 11be Date: 2020-07-02 Authors: Name Affiliations Address Phone email Laurent Cariou Intel Po-Kai Huang Intel Submission Slide 1 Laurent Cariou, Intel Corporation
July 2020 doc.: 20/0866r0 GCMP GCMP-256 is used when 192-bit security is needed. It is stronger than CCMP-128 which is considered 128-bit security. If stringer security is needed, then naturally you need 192-bit security => GCMP-256 GCMP-256 is recommended over CCMP-256 because HW wise GCMP-256 is faster than CCMP-256. In CCMP the MIC calculation part is based on an AES-256 chain , i.e. the AES-256 output over 128 bits serves as an input for the AES-256 calculation over the following 128 bits. GCMP is doing the same, but instead of AES-256 it uses MultH function, which is much faster (AES-256 calc takes ~7 clock cycles while MultH calc takes ~4). Due to the above, it is much easier to reach higher throughput with GCMP. Submission Slide 2 Laurent Cariou, Intel Corporation
July 2020 doc.: 20/0866r0 GCMP Encrypted Frame Frame Header PN 128 bits 128 bits Data 128 bits MIC IV MultH MultH MultH MultH MultH J0 Len(AAD)||Len(Data) {64bits} AES (K) {64bits} MultH CCMP MIC calculation sub-block GCMP MIC calculation sub-block Submission Slide 3 Laurent Cariou, Intel Corporation
July 2020 doc.: 20/0866r0 Straw Poll Do you agree to add to the 11be SFD the following: an EHT RSNA STA shall support GCMP-256? Submission Slide 4 Laurent Cariou, Intel Corporation
