Gloomy tales <a href=" http://aisxray.co.uk/lipitor-80-mg-price-comparison.pdf#ruffle ">lipitor 20 mg uk price</a> Plenty of other crypto functions (PBKDF2, bcrypt, scrypt) will iterate a hash 1000 times specifically to make it slower. At the time, elliptic curves were in vogue and hash-based RNG was under scrutiny. The hope was that elliptic curve techniques—based as they are on number theory—would not suffer many of the same weaknesses as other techniques (like the FIPS 186 SHA-1 generator) that were seen as negative, and Dual_EC_DRBG was an accepted and publicly scrutinized standard. SP800-90 (which defines Dual EC DRBG) requires new features like continuous testing of the output, mandatory re-seeding, optional prediction resistance and the ability to configure for different strengths.