Password psychology points to an approximate even split between linguistic and numeric passwords with about a quarter using mix of linguistic/numeric information. Names (proper, nicknames) are the most common information used for passwords, with dates second. Research is also being done on the effect of policies that force users to create more secure and effective passwords. The results of this study show that a password composition policy reduces the similarity of passwords to dictionary words. However, such policy did not reduce the use of meaningful information in passwords such as names and birth dates, nor did it reduce password recycling. Password Psychology
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