Patent ID: 11943332
Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 1:
2. The SBox circuit of claim 1, wherein the third circuit part comprises digital circuitry that performs a calculation according to:

R=Y0·M0·U⊕ . . . ⊕Y3·M3·U,, wherein:
each Mi is an 8×8 matrix representing 8 linear equations on the 8-bit input U,
i=0 . . . 3,

L=M0·U∥M1·U∥M2·U∥M3·U, 

⊕ represents an exclusive OR, XOR, operation, and
∥ represents concatenation.