Question

When applying secured AES to a long message (multiples of 128 bits), it will have different...

When applying secured AES to a long message (multiples of 128 bits), it will have different modes of encryption. Study the NIST SP800-38A publication: Recommendation for Block Cipher Modes of Operation and show all the recommended AES modes of encryption with a 256-bit message m = m1m2.

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Answer #1

There are five different modes of encryption:

(i) ECB Mode of Encryption:

(ii) CBC Mode of Encryption:

(iii) CFB Mode of Encryption:

(iv) OFB Mode of Encryption:

(v) CTR Mode of Encryption:

Hope this helps.

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