Cryptographically Random definition
Cryptographically Random means unpredictable, in that no polynomial-time algorithm, given any sequence of bits, can guess the succeeding K bits with probability greater than ½^K + 1/P(K) for any (positive) polynomial P and sufficiently large K.
Cryptographically Random means unpredictable, in that, at any point regardless of how many preceding bits are available, the probability of predicting the next succeeding K bits is greater than ½^K.