rainbow table
n.— «The tables—totaling 500GB— form the core data of a technique known as rainbow cracking, which uses vast dictionaries of data to let anyone reverse the process of creating hashes—the statistically unique codes that, among other duties, are used to obfuscate a user’s password.…Security professionals have questions whether a business can be created by offering access to rainbow tables.» —“Gold at the end of rainbow cracking?” by Robert Lemos SecurityFocus Nov. 9, 2005. (source: Double-Tongued Dictionary)