Rainbow Table

A rainbow table is a precomputed table for reversing cryptographic hash functions, usually for cracking password hashes. Tables are usually used in recovering the plaintext password, up to a certain length consisting of a limited set of characters. It is a practical example of a space/time trade-off, using more computer processing time at the cost of less storage when calculating a hash on every attempt, or less processing time and more storage when compared to a simple lookup table with one entry per hash. Use of a key derivation function that employ a salt makes this attack infeasible.

Rainbow tables are an application of an earlier, simpler algorithm by Martin Hellman.

Read more about Rainbow Table:  Background, Precomputed Hash Chains, Rainbow Tables, Defense Against Rainbow Tables, Common Uses, See Also

Famous quotes containing the words rainbow and/or table:

    Captain, the man of skill, the expert
    Leader, the creator of bursting color
    And rainbow sortilege, the savage weapon
    Against enemies, against the prester,
    Presto, whose whispers prickle the spirit.
    Wallace Stevens (1879–1955)

    Life is a thin narrowness of taken-for-granted, a plank over a canyon in a fog. There is something under our feet, the taken-for-granted. A table is a table, food is food, we are we—because we don’t question these things. And science is the enemy because it is the questioner. Faith saves our souls alive by giving us a universe of the taken-for-granted.
    Rose Wilder Lane (1886–1968)