The public and private key scheme is interesting because data encrypted with a public key can only be decrypted with the associated private key.

公钥与私钥方案非常有趣，因为使用公钥加密的数据只能由相关私钥进行解密。

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Proposed a pay-TV scheme with user revocation, but it is a private-key scheme, also it does not provide multiple-service capability and meantime can not resist collusion attack.

Mu等人提出了一个可撤销用户的付费电视方案，但其方案是私钥方案，并且没有提供多服务的功能，同时也不能抵抗共谋攻击。

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Based on high effective locations algorithm and error estimate, improvement of the public-key scheme based on Chebyshev maps proposed recently was presented and a key agreement protocol was given.

基于高有效位的数字计算方法和误差估计方法，对目前已提出的基于切比雪夫映射的公钥加密方法进行了改进，得到一种密钥协商协议。

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"Extending eligibility to the Blue Badge scheme is a key element of our commitment to modernising the scheme, " said transport minister Carl Sargeant.

BBC: Blue badge disabled parking to be extended in Wales

Another key priority for the scheme is for successful projects to share best practice across the public sector.

BBC: Finance Committee

The draft rules also outline a new cap-and-trade scheme for key pollutants, and will require the largest culprits to publicly disclose their emissions -- which environmentalists said was a step toward greater transparency.

CNN: Beijing tries to clean up its act