Research Article
Dynamic Rule Encryption for Mobile Payment
Table 5
Inverse substitution look-up table.
| ā | Input | Output |
| Nibble 1 | 0000 | 1111 | 0001 | 0100 | 0010 | 0101 | 0011 | 1000 | 0100 | 0010 | 0101 | 1100 | 0110 | 1011 | 0111 | 0000 | 1000 | 1010 | 1001 | 1110 | 1010 | 1001 | 1011 | 0111 | 1100 | 1101 | 1101 | 0011 | 1110 | 0001 | 1111 | 0110 |
| Nibble 2 | 0000 | 1110 | 0001 | 0111 | 0010 | 0100 | 0011 | 1011 | 0100 | 0101 | 0101 | 1001 | 0110 | 1111 | 0111 | 1000 | 1000 | 0011 | 1001 | 0110 | 1010 | 1101 | 1011 | 1010 | 1100 | 0010 | 1101 | 0000 | 1110 | 1100 | 1111 | 0001 |
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