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All Forums >> [Scripting] >> WSH & Client Side VBScript >> VBScript PIN validator
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VBScript PIN validator - 6/21/2001 6:31:51 AM

anton

Posts: 11
Score: 0
Joined: 6/9/2001
From: USA
Status: offline

Hi,

I have a script that produces random numbers between an upper and
lower bound value.

My random numbers can be between 4 and 8 digits long. I pass in
how many digits the length has to be into the function.

Basically i need to write a function that checks that my PIN's are not
things like 1234, 1111, 2222, 3333, 9876 that kinda thing. Basically
any numbers that would be easy to think of to try and hack into an
account i want to preven being used, if this is the case then return
false.

Obviously if there are more than 4 digits then the same applies for >
4 . i.e. 12345, 54321, 11111, 22222, 123456, etc etc.

Any suggestions appreciated!!

Post #: 1

Re: VBScript PIN validator - 6/21/2001 6:33:33 AM

compugenie

Posts: 9
Score: 0
Joined: 6/9/2001
From: USA
Status: offline

You really only need one function (it is below)
To check for 56789 do CheckSEQ(var, 1)
To check for 98765 do CheckSEQ(var, -1)
to check for 11111 do CheckSEQ(var, 0)

It won't work for values over 9 (9012 for instance) but
it wouldn't be hard to modify it to do so..

function CheckSEQ(var, increment_by)
for i = 2 to len(var) -1
if clng(mid(var,i,1)) <> clng(mid(var,i-1,1)) + increment_by then
exit sub
end if
next

if i = len(var) + 1 then
CheckSEQ = false 'SEQ failed, easy to guess
else
CheckSEQ = true
end if
end function

(in reply to anton)

Post #: 2

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