Manuel Ilium raised the following interesting question : suppose we are given an approximate root of an unknown polynomial with integer coefficients and a bound on the degree and maguitude of the coefficients of the polynomial. Is it possible to infer the polynomial ? we answer his question in the affirmative. We are able to show that if a complex number α satisfies an irredueible primitive polynomial p(x) off degree d with integer coefficients each of magnitude at most H then given O(d2 + d. loglI) bits off time binary expansion of the real and complex parts of , we can find p(x) in deterministic polynomial time (and then compute in polytJomlal time arty further bit of c). Using the concept o! secure pseudo random sequences formulated by Blunt, Micali and Yao we show then that the binary (oz p-ary for arty p) expansions of algebraic numbers do not, from secure sequences in a certain well delined sence.