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> IBOX A Index into SBOX Rabbit 4000 Instruction

> Opcode | Instruction | Clocks | Operation
> ED 12 | IBOX A | 4 (2,2) | A = ibox(A)

> Flags | ALTD | IOI/IOE
> S | Z | L/V | C | F | R | SP | S | D
> - | - | - | - |  | · |  |  |

> #### Description

> The inverse sbox structure is a 256-byte lookup table used by the AES-128 cipher. A contains the index into the table and is replaced by the referenced value from the table.

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