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by nyana » Mon Mar 03, 2008 7:01 pm
So theoretically a Sentry safe has a digital lock system, with keypads of numbers 09....the combination maximum limit is four digits. How many possible combinations of numbers could come out of this? Can someone give me advice, a program to use to calculate all possible combinations? How many, essentially would there be?
0123456789
FULL COMBINATION IS FOUR DIGITS LONG, so how many combinations could those numerics make, and what would they be? IS there some sort of program I can use, or tool to get every possible outcome of these numbers, in four digit length?
Thanks, and take care.
dream

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by cjames73 » Mon Mar 03, 2008 7:29 pm
hi nyana, welcome to the site.
discussions on safe opening are restricted to the advanced forums only.

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by Urbex » Tue Mar 04, 2008 12:29 am
If I did the math correctly, 362880 possible combinations.
You will be sitting there for a long, long, long time.

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by keysman » Tue Mar 04, 2008 12:53 am
nyana wrote:
IS there some sort of program I can use, or tool to get every possible outcome of these numbers, in four digit length?
Yes there is tool.. been around for centuries
Pencil + paper (Lines make it a little easier but not necessary)
Take sharp pencil write 0000 on the paper
next line write 0001
next line write 0002
continue on until you have written down all possible 4 digit combinations
sharpen pencil as necessary.
Everyone who eats potatoes eventually dies. Therefore potatoes are poisonous.

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by Safety0ff » Tue Mar 04, 2008 1:14 am
Urbex wrote:If I did the math correctly, 362880 possible combinations.
I got a much smaller number than that because there's 10 possible digits and 4 slots or there's 10 possible digits and 1 to 4 slots. I know where you got that answer from: 9!=9*8*7*6*5*4*3*2*1=362880
Problems with your math:
0 is a digit don't forget to count it.
Assumes the same digit isn't used twice.
Allows for 9 digit combination.

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by poor paperclip picker » Tue Mar 04, 2008 1:32 am
Safety0ff wrote:Urbex wrote:If I did the math correctly, 362880 possible combinations.
I got a much smaller number than that because there's 10 possible digits and 4 slots or there's 10 possible digits and 1 to 4 slots. I know where you got that answer from: 9!=9*8*7*6*5*4*3*2*1=362880 Problems with your math: 0 is a digit don't forget to count it. Assumes the same digit isn't used twice. Allows for 9 digit combination.
if all that is true, which i took in account, you should get a larger number than 362880, not a smaller number. I got 1048576.

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by Safety0ff » Tue Mar 04, 2008 2:01 am
poor paperclip picker wrote:if all that is true, which i took in account, you should get a larger number than 362880, not a smaller number. I got 1048576.
I think you might have inverted your exponent/power with your base .

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by poor paperclip picker » Tue Mar 04, 2008 2:09 am
Safety0ff wrote:poor paperclip picker wrote:if all that is true, which i took in account, you should get a larger number than 362880, not a smaller number. I got 1048576.
I think you might have inverted your exponent/power with your base .
yeah I couldn't remember which one went where... oops my bad
but it makes sense to me, number of slots with number of possible digits... I don't know its been awhile since my algebra days..

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by poor paperclip picker » Tue Mar 04, 2008 2:11 am
i guess either way there is going to be a lot of combos... so nyana do not try breaking into the safe...

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by Safety0ff » Tue Mar 04, 2008 2:29 am
Who says it'll let you try all the combos anyways.

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by keysman » Tue Mar 04, 2008 2:54 am
poor paperclip picker wrote:=362880
if all that is true, which i took in account, you should get a larger number than 362880, not a smaller number. I got 1048576.[/quote] Urbex wrote:If I did the math correctly, 362880 possible combinations.
You will be sitting there for a long, long, long time.
Hold on ! If there can only be 4 digits than the largest # will be 9999 starting at 0000 that leaves 10,0000 possible combinations not 362K or more
Everyone who eats potatoes eventually dies. Therefore potatoes are poisonous.

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by Safety0ff » Tue Mar 04, 2008 3:12 am
keysman wrote:Hold on ! If there can only be 4 digits than the largest # will be 9999 starting at 0000 that leaves 10,0000 possible combinations not 362K or more
Precisely. I was just correcting the other ppl but I didn't want to help nyana. It's quite simple to find out how many possible combo's there is whether using mathematical methods or rationalising it as you have. I knew it was 10k. Proof: Safety0ff wrote:I think you might have inverted your exponent/power with your base .
4^10=1 048 576
10^4= 10 000
If you look at it as 4 is the maximum number of digit then the answer is:
10^4+10^3+10^2+10=11 110.

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by Urbex » Tue Mar 04, 2008 10:17 am
Well I tried, but it doesn't matter...
It's still going to be a ridiculous amount of combinations.

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by mcm151201 » Tue Mar 04, 2008 11:34 am
Not to mention that the safe will lock out for a while after a certain number of incorrect attempts are made, so sitting at it trying all possible combinations would take and exceedingly massive amount of time. Theoretically of course

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by FFVison » Wed Mar 05, 2008 11:33 am
10 possible digits per wheel: 0...9
for each digit of the combination, you multiply the numbers together, so for a 2 digit combination, it's 10 * 10 or 100. For 3 digits, it's 10 * 10 * 10 which is 1000. This pattern could be simplified by the following equation (number of digits)^(number of wheels you need to turn to the correct digit). If you are only working with wheels with 10 digits going from 0 to 9, it should be easy to figure out. The working combination is a 4 digit number with a value somewhere between 0000 and 9999, so you have exactly 10,000 possible combinations. After typing for a bit, I realized that you are dealing with pushing buttons to get the number, not turning wheels, but it's the same principle for figuring out the maximum number of combinations.

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