The size of the table can be increased (to strengthen the cipher) by using an extension of the plaintext source. If the table remains constant for the entire plaintext, the substitution is monalphabetic; if it changes with each advance of one symbol position in the plaintext, possibly repeating a fixed schedule, it is polyalphabetic.
"substitution cipher." A Dictionary of Computing. . Encyclopedia.com. (September 26, 2018). http://www.encyclopedia.com/computing/dictionaries-thesauruses-pictures-and-press-releases/substitution-cipher
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