Just my opinion... Of it is worth doing, it is worth doing right.
We use Rsa tokens which are similar on that the token generates a
number which the user sees and the server knows. We protect
applicaton use with these.

Rsa isn't the only option. There are phone token generator apps.
There are other vendors.

Aladdin makes various devices as well as software.

If you just have one user, look for vendors with development kits.
That can get you in on the cheap and be crypotraphy secure.

Another thing to look at is how encrption key exchange (ssl/wifi wpa)
occurs. You could perhaps borrow sample code and generate a phrase
vs hex characters via ROT.

Just some ideas...

Sent from my iPod

On Jun 11, 2010, at 5:07 PM, "Simon Coulter" <shc@xxxxxxxxxxxxxxxxx>

Looking for suggestions:

I want to protect access to an application via a password. I want the
password to automatically change daily. I want the application to be
able to determine today's password without having to read it from an
external source (i.e., algorithmically/programmatically derived). This
last requirement means:

o no special profile with password changed daily
o no validation list use
o no encrypted password stored in external object such as *FILE or

I envisage:
o Application objects are *PUBLIC *EXCLUDE
o Application objects are authorised to a specific group profile
o Password generator is *PUBLIC *EXCLUDE
o Password generator is authorised to a specific profile (different
from the above)

In actual use a user who is a member of the application group AND who
needs to use this particular application will request the password
from an authorised issuer. The issuer will use the password generator
to determine today's password. The user will then use the application.

The "automatic daily change" requirement means the password
validation is tied to the date but obviously simple encryption linked
to the date will not be very secure nor will each daily password be
sufficiently different from the previous one.

I have some ideas but thought I would see what others suggest--always
presuming you think this sufficiently interesting to bother with :)

Simon Coulter.
FlyByNight Software OS/400, i5/OS Technical Specialists

Phone: +61 2 6657 8251 Mobile: +61 0411 091 400 /"\
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