<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=Content-Type content="text/html; charset=iso-8859-1"> <META content="MSHTML 6.00.2900.2769" name=GENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=#ffffff> <DIV><FONT face="Courier New">Hi,</FONT></DIV> <DIV><FONT face="Courier New">I need to generate random numbers of 512 bits.</FONT></DIV> <DIV><FONT face="Courier New">I use the following code :</FONT></DIV> <DIV><FONT face="Courier New"></FONT> </DIV> <DIV><FONT face="Courier New"><STRONG>mpz_t p;</STRONG></FONT></DIV> <DIV><FONT face="Courier New"><STRONG>gmp_randstate_t rstate;</STRONG></FONT></DIV> <DIV><FONT face="Courier New"><STRONG>mpz_init2(p,512);</STRONG></FONT></DIV> <DIV><FONT face="Courier New"><STRONG>gmp_randinit(rstate,GMP_RAND_ALG_LC, 32);</STRONG></FONT></DIV> <DIV><FONT face="Courier New"><STRONG>mpz_urandomb(p, rstate, 512); </STRONG></FONT></DIV> <DIV><FONT face="Courier New"></FONT> </DIV> <DIV><FONT face="Courier New">The numbers are generated but the problem is that if I run several times this code it produces the SAME sequence of random numbers. </FONT></DIV> <DIV><FONT face="Courier New">How can I solve this problem? </FONT></DIV></BODY></HTML>