不可检测性是指水印作品和普通作品在统计噪音分布上不存在区别,攻击者无法用统计学方法确定水印的位置。()
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信息加密和信息隐藏式信息安全的两种主要手段。()
A. 对
B. 错
水印的嵌入、提取时只能采用一种密钥。( )
A. 对
B. 错
Thrown into a demanding environment, students may have difficulty __________ the stress, and then they may turn to ________ even when they are not hungry. When people eat to reduce stress, it is called __________eating.
1)Whatkindofchildrendoesthespeakertalkabout?
A. Childrenwhohelpedanimals.
B. Childrenwhokeptanimalsaspets.
Childrenwhogrewuplikeanimals.
D. ChildrenwholikedtospendtimeWithanimals.