正好搜到這個問題了In order to make the cipher and its inverse more similar in structure,the linear mixing layer of the last round is different from themixinglayer in the other rounds. It can be shown that this does not improveor reduce the security of the cipher in any way. This is similar to theabsence of the swap operation in the last round of the DES.

就是為了對稱性[1],然后說對整個密碼的影響不大.

reference:

[1] Joan Daemen, Vincent Rijmen,AES Proposal: Rijndael, NIST AES proposal, 1998

[2] O. Dunkelman and N. Keller. The effects of the omission of last round's mixcolumns on aes. Inf. Process. Lett., 110(8-9):304–308, 2010.

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