Why I can login aix by password which contain suffix

Question

Sorry for the weird title.My English is poor,so I want to explain it here.Let's assume that correct password of this aix machine(Version 6.1) is "mypasswd".Accidently I login successfully by "mypasswd2" too.What's the matter?Why I can login by password which contain a suffix?

Answer 1

There is a limit of 8 characters for password in old traditional Unix. This link tells of the old limitations in AIX and the new abilities in the newer versions and how to set them up.