general idea - concept, causing interest - intriguing, the condition of being apart from others - privacy, without pattern or purpose - random, a person receiving something - recipient, make up of many parts or factors; difficult to understand - complex, thought of or invented - devised, to change from one system of communication to another - encode, highly developed - sophisticated, a way of solving a mathematical problem - algorithm, having 2 sides that are not the same - asymmetric, a way of changing text in order to hide its meaning - cipher, a form of text written in code - ciphertext, a person who specializes in using codes and ciphers - cryptanalyst, to change a message written in code into plain text - decipher, the act of putting a message into a code form - encryption, a mathematic graphic that shows how often certain events happen - frequency table, having matching halves - symmetric,

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