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In AES the 4×4 bytes matrix key is transformed into a keys of size __________

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In AES the 4×4 bytes matrix key is transformed into a keys of size __________

(a) 32 words

(b) 64 words

(c) 54 words

(d) 44 words

I got this question in class test.

My question comes from The AES Algorithm in section Advanced Encryption Algorithm and Block Cipher Operation of Cryptograph & Network Security

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Correct choice is (d) 44 words

Explanation: In AES the 4×4 bytes matrix key is transformed into a keys of size 44 bytes.

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