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- Newsgroups: comp.lang.rexx
- Path: sparky!uunet!usc!ucla-cs!netcon!hatch!richg
- From: richg@hatch.socal.com (Rich Greenberg)
- Subject: Re: Ascii Dictionary Needed!
- Message-ID: <C1FzGM.IFD@hatch.socal.com>
- Organization: Hatch Usenet and E-mail. Playa del Rey, CA
- References: <REXXLIST%93012112235319@UGA.CC.UGA.EDU> <19930121172107SEB1525@MVS.draper.com> <2962.imc@uk.ac.ox.prg>
- Date: Tue, 26 Jan 1993 03:38:44 GMT
- Lines: 28
-
- In article <2962.imc@uk.ac.ox.prg> imc@comlab.ox.ac.uk (Ian Collier) writes:
-
- >This depends on what system the passwords are for. Certainly on Unix there
- >are many guidelines on what passwords should look like, but I never heard of
- >any such restrictions on VM except for the blatantly obvious (e.g. no AAAAAAA
- >or QWERTY) (note that it does no harm to be safe, however). The reason is
- >that while the Unix passwords file is encrypted and globally readable, VM
- >passwords are kept secure (and, I believe, unencrypted) in the CP directory
- >- and most VM systems revoke a userid after several successive failed
- >attempts at entry. This means that (as far as I know) it is impossible to
- >write an automatic password cracker on a typical VM system. My first
- >password on a VM system at IBM was an English word. Of course, feel free
- >(indeed obliged) to correct me if the above is wrong.
-
- In vanilla VM, passwords can be 1-8 chars, case insensitive, no restrictions.
- Its stored encrypted (not a secure encryption tho) in the directory.
- The directory is (normally) not readable by anyone except the
- sysadmin(s).
- Various add-on security packages add additional security such as
- format of the password, ageing and revoking.
-
- BTW, in Unix SVR4, the encrypted passwords are moved from /etc/passwd
- to /etc/shadow to prevent someone encrypting many possible passwords
- and comparing the encrypted value to /etc/passwd.
- --
- Rich Greenberg Work: rmg50@juts.ccc.amdahl.com 310-417-8999
- N6LRT Play: richg@hatch.socal.com 310-649-0238
- What? Me speak for Amdahl? Surely you jest....
-