RC4 is a stream cipher algorithm operating on each byte of data; like the RC2, it supports key lengths of 40 bits, 64 bits, and 128 bits.

RC 4是一个流密码算法，它对数据的每个字节进行操作；和RC 2一样，它支持长度为40位、64位和128位的密钥。

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The algorithm is referred to as a stream or block cipher depending on whether the algorithm transforms the message one byte at a time or a block (eight bytes) at a time.

算法被称作流密码(stream cipher)还是块密码(block cipher)，取决于算法转换消息时是一次一个字节还是一次一个块(8个字节)。

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The stream cipher mode encodes data one bit at a time.

流密码模式一次一位对数据进行编码。

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