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Figure 9 is quite common, because of its simplicity. It is used in SSL and WEP. The WEP stands for Wireless Equivalent Privacy which abase stream is XORed with group of generated keys. The key stream does not rely on plaintext ever. Vernam stream cipher is protocol also used the RC4 algorithm for confidentiality. It was counted safe till it was violated by BEAST attack [19]. It is a stream cipher, symmetric key encoding algorithm. The algorithm is mutual for both encoding and decoding. The