Password bank regular basis, or to use a single password for all websites (which really defeats the purpose of passwords for security - an attacker need only break one password to harvest your entire online identity). Password cracking is an issue professional organizations are protecting themselves against. In June 2011, the storage service Drop Box failed to protect password authentication for a period of four hours, exposing the files of 25 million users. The Ponemon Institute surveyed 830 information technology, security, and compliance professionals. Over half of them cited emails as the main cause of data leaks. As a result, industry experts
Most recent common ancestor Most recent common ancestor In biology and genealogy, the most recent common ancestor (MRCA, also last common ancestor (LCA), or concestor) of any set of organisms is the most recent individual from which all the organisms are directly descended. The term is also used in reference to the ancestry of groups of genes (haplotypes) rather than organisms. The MRCA of a set of individuals can sometimes be determined by referring to an established pedigree. However, in general, it is impossible to identify the exact MRCA of a large set of individuals, but an estimate of the time at which the