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Sub byte uses an S-box to perform a byte-by-byte substitution of the block. The left most 4 bits of the byte are used as row value and the rightmost 4 bits are used as a column value. These row and column values serve as indexes into the S-box to select a unique 8-bit value.

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Aish Khan

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2y ago
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Anuj Kandel

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3y ago

One 128-piece square is delineated as a square matrix of bytes.

This square is copied into the State array, which is changed at

each phase of encryption or decryption. After the last stage, State

is replicated to output matrix.

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shabanam ansari

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3y ago

since all operation performed in AES encryption decryption process is byte based, so it makes computation easier by converting 128/192/256 bit data(or 16/24/32 byte) data in state array where each entry in the state array represents one byte data.

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Q: What is the purpose of the state array in AES?
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