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I am not very familiar with the usual way of doing things on wiktionary, so I didn't know where to place this, but I wanted to add that the last two definitions come from the use of the word "cipher" to refer to any circle (in addition to zero and the letter "O") in the terminology of the Five Percent Nation. These uses of the word has spread throughout hip-hop culture and has been adopted by non-Five Percenters in the two cases mentioned. --Tinyfolk 21:13, 24 April 2007 (UTC)

Merely protecting something with a password or something like that also qualifies as encryption.