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As a continuation of Symmetric Encryptions, you'll learn about another type of cypher, a Stream Ciphers and how it functions. We'll define XOR and examine what happens during it, what transposition & substitution is, and whether or not multiple transposition & substitution are preferred. You'll observe a demonstration of how XOR provides encryption. You'll also learn what RC4 is and what takes place at the encryption and decryption level, why you must understand the key functions of each of these events, what their impact is on each other and when there is an advantage to using one over another in Symmetric Encryption.