求翻译：是一种将一个密钥扩展成一由完全伪随机数组成的任意长的密钥流。加密是由生成的密钥流和原文异或运算得到的密文，如图2.2所示。解密则是通过密钥k 和初始变量v 共同生成的密钥流和密文做异或运算得到原文。是什么意思？

Is a key expansion into a complete pseudo-random number for any length of key stream. Encryption is the ciphertext from the key stream generated by the original iso or operator, shown in Figure 2.2. The decryption key k and the key stream generated by the initial variable v and ciphertext do XOR ope

It is a one of the keys is to be expanded into a pseudo-random number by the total of any length of key stream. Encryption is generated by the key stream and original exclusive-OR operator is the key document, such as shown in Figure 2.2 . It is decrypted by key K, and initial variable V generated b

Is one kind expands a key one the random length key class which is composed by the complete pseudo-random number.The encryption is flows the scrambled text by the production key which obtains with the original text "or else", as shown in Figure 2.2.The decipher is the key which v produces together t

Is the extension of a key into a pseudo-random number consisting entirely of arbitrarily long stream of key. Keys for encryption are generated by redaction of the flow are original and exclusive-or operation, as shown in Figure 2.2. Decrypt the initial variables is through a key k and v together gen

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