＜正＞Dear editor,Blockciphers play an fundamental role for cryptography in information security,which usually consist of round functions and key schedules.As one of the significant modules in blockciphers,key schedules have not received deserved attention.Commonly,the key schedule takes as input a master key and outputs the so-called round keys that are used in each round.In the case of AES-128,the master key is a 128-bit string and the total length of the round keys is11×128=1408 bits.The AES-128 key schedule can be seen as a function from{0,1}128 to{0,1}1408.
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