As cryptographic practical method which can be theoretically proven that safety is expected. This is the same pseudo-random number.
However, in the study on the safety of PRNG that is used for the OS, such as Windows and Linux, the following problems are mentioned. In the model of security proofs, demonstrating the safety of the PRNG with entropy assumption that they can be secured, possibility of attack by the vulnerability of RC4 used to output a pseudo-random number sequence, the vulnerability due to an update interval of internal state and the possibility of the attack by the pseudo-random number generation in user mode.
The purpose of this study is to evaluate the safety of the pseudo random number used in the practical cryptography.