%0 Journal Article %T On RSA Moduli with Almost Half of the Bits Prescribed %A Sidney W. Graham %A Igor E. Shparlinski %J Mathematics %D 2007 %I arXiv %X We show that using character sum estimates due to H. Iwaniec leads to an improvement of recent results about the distribution and finding RSA moduli $M=pl$, where $p$ and $l$ are primes, with prescribed bit patterns. We are now able to specify about $n$ bits instead of about $n/2$ bits as in the previous work. We also show that the same result of H. Iwaniec can be used to obtain an unconditional version of a combinatorial result of W. de Launey and D. Gordon that was originally derived under the Extended Riemann Hypothesis. %U http://arxiv.org/abs/0709.2704v1