8/23/2020 0 Comments What Is Rcon
The values xi-1 are to be computed in the same representation of GF(28) as used in all other operations in AES (see at the end on how to do this), but you can also take them from a table in the Wikipedia article, or from the examples in Appendix A of the AES standard.This means, this step only modifies the first byte of the column, the others are unaffected.
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