The data Encryption Standard is a block cipher, meaning a cryptographic key and algorithm are applied to a block of data simultaneously rather than one bit at a time.

数据加密标准是一个块密码，意义一个密钥和算法应用于一个数据块同时而不是一个比特。

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HDLC, which is widely applied to control protocol of Data Link Layer, is based on bit.

HDLC是一种面向比特的链路控制规程，广泛用作数据链路层的控制协议。

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To add to the confusion, many services on the internet are now nested within one another, making it very difficult to really keep track of the level of privacy that will be applied to any discreet bit of you own personal data or content.

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