US 12,250,321 B2
Method for authenticating messages in resource limited systems
Dacfey Dzung, Wettingen (CH); and Thanikesavan Sivanthi, Würenlingen (CH)
Assigned to Hitachi Energy Ltd, Zürich (CH)
Appl. No. 17/429,137
Filed by Hitachi Energy Ltd, Zürich (CH)
PCT Filed Feb. 5, 2020, PCT No. PCT/EP2020/052897
§ 371(c)(1), (2) Date Aug. 6, 2021,
PCT Pub. No. WO2020/161201, PCT Pub. Date Aug. 13, 2020.
Claims priority of application No. 19155836 (EP), filed on Feb. 6, 2019.
Prior Publication US 2022/0094552 A1, Mar. 24, 2022
Int. Cl. H04L 9/32 (2006.01); H04L 9/00 (2022.01)
CPC H04L 9/3242 (2013.01) [H04L 9/50 (2022.05); H04L 2209/30 (2013.01)] 22 Claims
OG exemplary drawing
 
1. A method for message authentication, comprising preparing a data block having a block length;
determining an available length based on the block length and a maximum length of a data frame;
calculating a message authentication code (MAC) based on the data block, the MAC having a MAC length not greater than the available length;
calculating an additional MAC based on the data block, the additional MAC having an additional MAC length not greater than the available length;
creating the data frame that comprises the data block and the MAC; and
creating an additional data frame that comprises the data block and the additional MAC.