At Present, research on security in MANET is still in its infancy.

目前对其安全性的研究还处于起步阶段。

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Block cipher is an important branch of cryptography. Research on security of block cipher is an important direction.

分组密码是密码学的一个重要分支，分组密码的安全性研究成为一个重要的课题。

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With the improvement of hardware and software technologies, people make a new requirement for the research on Security algorithm.

随着软硬件技术的提高，人们对安全算法提出了新的要求。

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That's Dean Cheng, an expert on Chinese political and security affairs at the U.S. Research Institute, the Heritage Foundation.

VOA: standard.2010.04.21

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The organization has done some quality work on retirement security and published an independent research project I wrote last year on structured products.

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