162K GAMING USERPASS.txt
3) Finally, I created a hash of parts of the user-agent string following a successful login, containing the users OS, browser (general not versions) and language - forming a sort of secondary password. If the useragent hash is significantly different on next login, the user is asked to answer the security question. Then, if this is answered satisfactory, the new UA string is hashed and added to their "safe machines" list, so that they wont be asked again from this machine. This is similar to a mechanism employed by the Steam gaming system.
162K GAMING USERPASS.txt
There is some evidence to suggest that elevated symptoms of ADHD are associated with excessive internet use in children and adolescents [93], as well as adults [94], but the causal direction of this association is unclear (i.e. elevated ADHD symptoms could trigger excessive internet use, or excessive internet use could lead…