Unpredictability
In applications such as reciprocal authentication and session
key generation, the requirement is not so much that the sequence of numbers be
statistically random but that
the successive members of the sequence are unpredictable. With "true" random
sequences, each number is statistically independent of other numbers in the
sequence and therefore unpredictable. However, as is discussed shortly, true
random numbers are seldom used; rather, sequences of numbers that appear to be
random are generated by some algorithm. In this latter case, care must be taken
that an opponent not be able to predict future elements of the sequence on the
basis of earlier elements.
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