misc. permutability
我们的产品作为可置换性配件可以直接使用于产品上。
Our products are fully guaranteed to be fit-for-use as replacement parts.
结果表明，在所用分组密码是伪随机置换的条件下，方案在分块适应性攻击模型下是可证明安全的。
Investigation shows that the scheme is provable security under the blockwise adaptive attack model if the underlying block cipher is a pseudorandom permutation.
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