Complex sentence: When the numbers are very large, no efficient integer factorization algorithm is publicly known; an effort concluded 2009 by several researchers factored a 232-digit number (RSA-768) utilizing hundreds of machines over a span of 2 years.
Split into simpler sentences: When the numbers are very large, no efficient integer factorization algorithm is publicly known. An effort concluded 2009 by several researchers factored a 232-digit number (RSA-768) utilizing hundreds of machines over a span of 2 years.