Password length parameter Password length parameter In telecommunication, a password length parameter is a basic parameter the value of which affects password strength against brute force attack and so is a contributor to computer security. One use of the password length parameters is in the expression formula_1, where formula_2 is the probability that a password can be guessed in its lifetime, formula_3 is the maximum lifetime a password can be used to log into a system, formula_4 is the number of guesses per unit of time, and formula_5 is the number of unique algorithm-generated passwords (the 'password space'). The degree of password security
Most recent common ancestor all of the modern population. Due to pedigree collapse, modern individuals may still exhibit clustering, due to vastly different contributions from each of ancestral population . 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.