特别对于高级加密标准算法的S盒设计，增加掩码设计可以加强抗线性攻击安全程度。
Especially, the masking design in S-box of advanced encryption standard can make the algorithm safer to against linear attack.
OSPF设计为支持可变长度子网掩码。
OSPF was designed to support variable-length subnet masking (VLSM).
OSPF设计为支持可变长度子网掩码。
OSPF was designed to support variable-length subnet masking (VLSM).
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