The term "alphanumeric" encompasses both letters and numbers, creating a versatile set that forms the foundation of written language, computer programming and secure password creation. Learn more ...

Some Web sites only allow alphanumeric characters (letters and numbers) in their passwords. This invites bad passwords, lowering security for everyone. Jonathan Eunice, co-founder and principal IT ...

How secure are your passwords? Probably not very. The guys over at Popsci have a neat partial solution to that problem: a DIY alphanumeric random password generator. Made with an Olimex AVR ...

To get your password, just enter "password of X characters" where X is your password length. In addition to the random password, you'll get the phonetic hint, such as "tango whiskey charlie kilo ...

I'm trying to add a user in the form "user.name" on a RHEL3 system, but useradd keeps telling me "invalid user name." Is there any way around it? That's probably some validation that useradd is doing.