This is not a real situation; please ignore legal issues that you might think apply, because they don't.
Recognizing number patterns is also an important problem-solving skill. If you see a pattern when you look systematically at specific examples, you can use that pattern to generalize what you see into a broader solution to a problem. Here are two activities that show the variety and fun of number patterns. At the bottom right part of the screen, you'll see 'Forgot Pattern' button. - Tap it and it will ask you to enter your email and password. - Type in the required information and tap 'sign in' and you'll be redirected to Google play.
Let's say I have a set of 200 known valid license keys for a hypothetical piece of software's licensing algorithm, and a license key consists of 5 sets of 5 alphanumeric case-insensitive (all uppercase) characters. Example:
Is it possible (or likely) to extrapolate other possible keys for the system?
What if the set was known to be consecutive; how do the methods change for this situation, and what kind of advantage does this give?
I have heard of 'keygens' before, but I believe they are probably made by decompiling the licensing software rather than examining known valid keys. In this case, I am only given the set of keys and I must determine the algorithm. I'm also told it is an industry standard algorithm, so it's probably not something basic, though the chance is always there I suppose.
If you think this doesn't belong in Stack Overflow, please at least suggest an alternate place for me to look or ask the question. I honestly don't know where to begin with a problem like this. I don't even know the terminology for this kind of problem.JasonMArcher
In general, the answer is, 'No, you can't do anything useful.'
If the people generating the keys got lazy and failed to use some sort of cryptographic-quality hash off of an index number (with sufficient bit-mixing to thwart any inspection on your part), then you might assume some sort of functional form of random number generation and see if you can back out, for example, a modulus for a linear congruential random number generator, or a series of bit-mixing shifts and adds and such as in the Jenkins hash function or whatever.
There are no algorithms for going from some generic structure that you spot to the algorithm that produces said structure; something akin to this is what you appear to be asking for. (Such algorithms are provably impossible in general; if you want the simplest algorithm that can compute your keys, the problem is isomorphic to the computation of Kolmogorov complexity, which is fiendishly hard ('effectively impossible thus far') to compute.)Rex KerrRex Kerr
Assuming that the system is cryptographically strong knowing those keys will do you no good. Now, many such systems are implemented by guys too cheap to buy a real keygen so you might still have a hope.
Just a little back of the envelop estimation says that such a key has 125 (was 800 oops, thanks for catching that) bits of information, if you sampled that space enough you might be able to make some sort of an attack, but you are talking about a huge number of sample points. But hey, what other plans did you have for your spare time?
Even the big guys mess this up, a half dozen years ago there was a mistake in the way MSDN keys were being generated that allowed some sort of brute force attack. You would find guys selling MSDN subscriptions on eBay as part of a corporate licensing bundle. You would submit your info and they would give you a preregistered MSDN account in a couple of days. I am pretty sure they were taking advantage of a bug in the implementation and brute forcing the enrollment until one stuck.
A company I worked for bought one, Microsoft honored it since we were none the wiser when we bought it, but they were interested in the address of the guy who sold it to us.UkkoUkko
This is notoriously hard to solve in the general case. However, if
I'm also told it is an industry standard algorithm
if this is the case, you should obtain a list of those 'standard algorithms', and analyze them for weaknesses.
My naïve guess is that most key generation is of the form x hash(x fixed), where x is a randomly generated value for each key, and fixed is a fixed value. Using this form, keys can be validated quite easily (extract x, calculate hash(x fixed), see if it matches).
Assuming you knew the exact algorithm used, you'd either have to find a weakness in the algorithm (not likely, unless they are using a hash with known vulnerabilities), brute-force the fixed value, etc.
Given that there are lots of hashes which do not have known vulnerabilities and if you assume that the guys who chose the fixed value where not dumb... this might be a tough cookie unless you have good cryptanalysis skills available.
So the problem is very hard to solve if the guys who designed the algorithm are not dumb. But they might be...
Keys that are validated offline tend to be defined by a set of some properties. Certain subsets of bits have certain values or symmetries. If certain subsets of bytes passed to certain functors return the expected result then the key is deemed valid.
If you researched common algorithms for generating keys you could probably come up with a universe of possible properties. You could then use inductive logic programming to find which of those properties apply to all valid keys, but not invalid keys. (You also need a set of invalid keys, but those are easy to generate). From the results you could theoretically write a keygen. You could also probably write a paper out of it, if you can get it to work. Good luck.
If they're validated online however, they may simple be pseudo-random numbers that are checked against a database. In that case you are SOL.patrospatros
The system could generate the keys randomly then have clients check against a central server. That is just as secure as any other DRM algorithm, that is to say not at all. In this case, extrapolation is impossible.Matthew FlaschenMatthew Flaschen
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Android smartphones are famous world wide for having various kind of useful applications and games. Since we download apps that we need like we use messengers, photo editors, calling apps, launchers and other security apps. We have already listed out best android apps. Android is a functional OS but not as secure as it should be. As we can easily download paid android apps for free, Which show that android is probably not secure. Normally we use pattern lock to protect phone for others or we even use some applications. It is a very easy and simple way to secure our personal mobile phone data with pattern lock. We have to just draw a pattern and that’s it. As we don’t have to bother about putting numbers or characters for password. Because we can easily forget numbers and characters as compare to pattern lock, it is a very rare case that you may forget your pattern lock.
As usual we use gmail account in play store it become easy to reset but if you don’t have an email address to reset it. So don’t worry, those who forgot their android pattern lock can easily unlock pattern lock without losing their personal data. As all these patterns can easily bypassed just by doing some effort. We probably reset our phone to remove these pattern lock. But what about if we want to rather Unlock Pattern Lock On Android Without Losing Data? Don’t worry you are at a right place. Here we found some methods through which you can unlock pattern lock any of your android smartphone. We are going to explain different methods to unlock android smartphone pattern lock without losing data. So choose which you find out easy to do.
How To Unlock Pattern Lock On Android Phone.
Method 1:- Unlock Pattern Lock On Android Without Losing Data.
- Download Aroma File Manager.
- A memory card for android device.
- You android device either locked by pattern lock or password lock.
Step 1. After downloading Aroma File Manager, place it in your memory card (SD card). Then, insert the memory card into your locked android device.
Step 2. Open Stock Recovery Mode with reboot your android device and pressing Power Key and Volume up key simultaneously. Different phones may have different methods to open stock recovery mode so if you face any problem Google it.
Step 3. After entering into recovery mode use Volume+ and Volume- buttons to scroll up and down. For select use middle button.
Step 4. From there click on “Install Zip from SD Card” and give path to install “Aroma File Manager” from SD card.
Step 5. After installing, it will open in recovery mode.
Step 6. From the Aroma File Manager navigate to settings >> go to bottom and click on “Automount all devices on start” and then exit.
Step 7. Now again click on “Install Zip from SD Card” and give path to install “Aroma File Manager” from SD card.
Step 8. After this you will get “Aroma File Manager” opened again.
Step 9. Now navigate to Data Folder >> System Folder and find >> “gesture.key” or “password.key” for pattern lock or password lock respectively.
Step 10. Delete that any one file and then exit aroma file manager and reboot your android device. After rebooting you will notice that password or pattern lock is not removed. But don’t worry draw any pattern and you will open your android device but remember or note that pattern because it will be saved.
Method 2nd:- Unlock Android Pattern Lock With SDK Tools.
1. First of all Download Android SDK and here we will show you How To download and install Android SDK Tools.
- Download and install Android SDK Tools for run ADB commands.Open the given page and then select platform according to you download and install it.
- After installing open it, unchecked the other packages and check Android SDK Platform-tools and then click on install packages according to the image given below.
2. So the other requirement is USB Debugging should be enabled before your android device was locked.
3. The process will probably not be helpful if you don’t have specific and compatible drivers for your phone. So you should be very careful While installing your device compatible drivers.
Steps To Unlock Android Pattern Lock.
Step 1. Connect your locked android phone with PC/Laptop via USB.
Step 2. Then, Open folder where you installed Android SDK Tools Users >> App Data >> Local >> Android >> Android-SDK >> Platform-Tools and then click on blank space hold shift and click right mouse button and select “open command window here”.
Step 3. It will open you command window. Then, you have to put some commands in the command window:-
For checking your device is connected or not put command:-
Then, put these commands:-
update system set value=0 where name=’lock_pattern_autolock’;
update system set value=0 where name=’lockscreen.lockedoutpermanently’;
If above commands not working put:-
adb shell rm /data/system/gesture.key
Step 4. Once you done the above steps, you have to reboot your android device. Now its all done.
After rebooting your device you will see the pattern lock disabled.
So in this method USB Debugging should be enabled before lock because it is a must. If it is not enabled then you cannot proceed further steps.
Method 3rd:- Unlock Pattern With Factory Settings (Data Will Lost).
Since, in the above methods we have used PC/Laptop, we downloaded software and we usedsome commands. But if you do not have a PC/Laptop or your device did not have USB Debugging enable, then you can follow this method.
How To Make A Serial Key Pattern Keychain
Note:- In this method your all data will be lost. So if you do not want to lose your data then don’t follow this method.
Step 1. First of all, Switch off your Locked Android Device.
Step 2. Then, boot your Android device into “Recovery Mode” using specific keys by holding power key and volume up key simultaneously.
Step 3. After opening Recovery Mode
- Select “Factory Data Reset” option and give “Yes“.
- Select “Wipe Cache Partition” to wipe cache data.
How To Make A Serial To Usb Connector
Step 4. Then, Reboot your device.
Step 5. All Done ! hence, your device will start from the scratch.
In conclusion, we feel that you have learned some interesting facts about how to unlock pattern lock on android. But few people may use this to hack but you should rather use this in a right way to help someone, or yourself. If you have any question leave your comments below.