Secret Key Systems - IDEA ETH Zuria bit blocks, 128 bit key, 0 bits parity: 64 bit input block 16 bit X i,a 64 bit output block Odd Encryption Round 16 bit X i,b 16 bit X i,c 16 bit X i,d 16 bit X i+1,a 16 bit X i+1,b 16 bit X i+1,c 16 bit X i+1,d ⊗ ⊗ ⊙ ⊙ K i, a K i, b K i, c K i, d ⊗ ⊙ Addition but throw away carries Multiplication mod
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