Long description

Three fictional characters labeled Alice, Bob and Eve are shown here as the placeholders, in transmiting a message. A key denotes the encryption and decryption process. Alice and bob takes the position at two ends, and eve positioned between them. An arrow from Alice points towards bob, with an encryption key in between, and is labeled Alice encrypts message with a key. An another arrow labeled Alice transmits cipher, is shown continued from the first arrow, and points towards Bob. A third arrow, is shown continued from the second arrow and points to Bob. Decryption is indicated by an another key, and is labeled Bob receives cipher and decrypts it using key. An arrow perpendicular to the second arrow points towards eve, and is labeled, Eve intercepts cipher but cannot understand it.