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XorIt - XOR File Encrypter

Version 1.135 KB Download / 100 KB Installed
20 Dec 07

2K / XP / 03 / Vista

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XorIt - File XORer

XorIt
Version 1.1
5 Dec 07

EMail
Website

This program is dedicated to Dr. Mike.

Program Info

Most file encryptors use methods that rely on the theory of computational security, that is difficulty of key factorisation prevents decryption of the file. But this method may not work forever. It used to be considered that a 56 bit key was unbreakable to brute force attacks, but the government of the USA now requires all Top Secret data to use keys of at least 192 bits. This bar will keep raising as computing power increases. (It is argued by some though that this will never happen due to the laws of physics!) XorIt is designed to use conventional XOR encryption on keys that are the same size as the file to be encrypted. Furthermore, if you use an unpredictable file that is the same size (or larger) than the original file and you use this file only once, this is known as a "one-time pad" and it is completely unbreakable, even to computers 1000 years from now. This is because there is no algorithm at all, just a big key, and thus there is no pattern to follow once you have decrypted any part of the file. Thus attempts to decrypt it could result in any file, and there would be no way to verify that it has decrypted correctly.

XorIt is a simplified version of our program CryptIt.

Contents

Installation
Use
Notes on XOR encryption methods
Programmers Notes
System Impact Statement
History
Licence and Registration
Liability
Contact

Installation

Run "Setup.exe" and follow the instructions. To remove XorIt, use the "Add/Remove Programs" option in the Control Panel. XorIt stores all its data files in the designated application data area, often "C:\Documents and Settings\USERNAME\Application Data\Sinner\XorIt". If you would prefer that it saves in the same directory as XorIt either run the program from a removable drive, such as a floppy of a USB drive, or delete the "DefSet.txt" file from the XorIt directory.

Use

When a file is XORed with another file for the purpose of encryption decryption is easy; just do it again! This is because the mathematical way to reverse a XOR is to XOR it. Thus there is no need to explain Encryption and Decryption as the process is the same either way.

First select the file to be XORed by either pressing the first "Choose" button and browsing for it, or by dragging a file onto the XorIt window. Any file is acceptable providing it is less than 4GB and has an extension. (I.e. Filename.XXX) Next you select the Cryption file to XOR the source with. You can do this by either pressing the second "Choose" button and browsing for it, or by dragging a file onto the XorIt window. The XOR method is especially powerful if you choose a Cryption file that is larger than the source, as most decryption programs work by looking for patterns. You can also choose a large file, but not use it all. To do this you simply enter in a lower number in the "Use XXX Bytes" window.

Next you select where the output files will go, the default being the same folder as the source. You can select it by using the "Choose" button, or by dragging a directory onto the "XorIt" window. You can use the combo box to reset to the "Desktop", or you should select either "Neat Folder" or "Folder". If "Neat Folder" is selected than a directory will be created from the first eight letters of the source filename (E.g. If the file is called "HardCore.jpg" then a directory called "HardCore" will be the default.), otherwise the folder will be as selected. Change this if you prefer something else, but make sure that there is no new directory in your selection. (I.e. New directories will NOT be created.)

It is extremely important to note that the file is Encrypted, not password locked. The difference being that there is no storing of the code itself anywhere - the whole file is mathematically scrambled based on the file you select. If you forget/lose the Cryption File there is no way at all to decrypt the file. (I.e. We cannot help!)

Once you are ready, press the "XorIt!" button and the file will be encrypted.

As an additional feature, XorIt is set to be an On Top window. To turn this off simply Right Click on the title bar and deselect "On Top Toggle".

Notes on XOR encryption methods

Any encryption is breakable... except if you use an unpredictable key file that is equal or larger than the file itself and you use it once only. When keys are used like this it is known as a One-Time Pad encryption. One-Time Pad encryption is un-breakable because it is just as likely that the file anything other than the original file. Attempts to decrypt it could result in any file, and there would be no way to verify that it has decrypted correctly. If you use the key again then there is a chance that a hacker could use parts common to both and partially extract the key, and then be able to partially extract the original files. This is extremely hard with only two files, but if you used the same key on varied files for 10+ times and you then lost all of these files then there is a decent chance that someone with sufficient time, motivation and skill could extract most of the key. (Less biased and better explained details can be found on Wikipedia and Here.) The key also cannot be any form of a stream cipher as this negates most of the advantages of the method. This is because once any part of a stream cipher encrypted file is decrypted, it is possible to then decrypt the rest of the file given sufficient skill and processing power. However, if a non-stream cipher is used then even if some part of the file is decrypted, that does not mean the whole file is compromised.

(The Blum Blum Shub pseudorandom number generator generator is one of the current exceptions to this rule, as while it is believed to be possible to reverse a stream from it, there are no cases of it actually happening.)

Unpredictable keys are hard to generate, and it is even harder to be sure that they are actually unpredictable. Some scientists believe that even radioactive decay follows predictable patterns. If you are using XorIt for small messages you could seriously consider generating your own the old fashion way (picking letters out of a hat) but this method is not practical for large files. When designing these programs we initially felt that people making/finding their own unique keys was part of the security, but in hindsight, this concept was wrong. It is too hard for many people to do this, even if they do understand the concepts of what makes a good key. For this reason we have written our own and included it in our program GigAlarm which makes files based on the variance between the CPU clock and the system clock. The results from the CPU clock function have been excellent when tested using ent, a well respected random file tester.

In short, XorIt encrypts files by logically applying "Exclusive Or" to each byte, using the Key file/string. The key needs to be unpredictable and not contain repetitions, especially of "nulls", to be secure. The weakness of the method is that you need to have a way of distributing the keys as well if you want to send an encrypted message. If you have a secure method of transporting the keys (one user gives CDs full of keys and then encrypts his EMails) then the method works well. Otherwise it is best used for encrypting personal data where there is no need to transport the key.

OTP encryption is often dismissed as "Snake Oil". This is largely because of a few software companies using stream ciphers and claiming that it is a OTP and thus unbreakable. CryptIt and XorIt are not like that. We do not use any secret algorithm, the only formula in CryptIt and XorIt is "XOR" itself. Nor do we provide raw key material, claim that the OTP does not need to be transferred or that it is easy to use. Please do not group us in this category. If you want easy and secure encryption, use any other method. If you want unbreakable encryption, try CryptIt or XorIt.

Programmers Notes

This program is a simplified version of my program CryptIt. Expansion of this program is unlikely as its purpose is to be a bare-bone XOR encrypter. If you want more features then I recommend you try CryptIt. This version is a general clean-up and tweak version. No new features have been added.

System Impact Statement

We go to great lengths to reduce system impact, but we feel that it is still important to explain here what our programs do to your system. If you feel we are missing something, or you need further clarification, please contact us.

RegistryXorIt does not use the registry. The installer that comes with XorIt uses the registry only for the required un-installation data, and not at all if you use the "Extract Only" mode.
System SettingsXorIt does not change any system settings.
FilesAll of its program files are stored in the installation directory, and all of its data files are stored in the designated application data area, often "C:\Documents and Settings\USERNAME\Application Data\Sinner\XorIt". If you would prefer that it saves in the same directory as XorIt either run the program from a removable drive, such as a floppy of a USB drive, or delete the "DefSet.txt" file from the XorIt directory. These directories can be opened via the About box.
NetworkXorIt and its installer do not access the internet in any way, but the ReadMe does have three graphic files that are stored on the internet. (They are not used as web-beacons, merely spacers and images for the payment processors.)
CPUXorIt can be very demanding on the CPU when encrypting.
MemoryXorIt needs around 50 MB while encrypting.

History

1.00Initial Version
1.01On Top Toggle
1.02Tweaks and bugfixes
1.03More Tweaks
1.1Internal revision, speed improvements, and interface changes

Licence and Registration

Permission is given to evaluate XorIt for a period of 30 days. After this time you are required to either register or remove XorIt. Permission is given for all forms of distribution, including CD compilations and Websites, providing the ZIP file is unaltered and it is made clear that XorItis a Shareware program and that registration is required for continued usage. XorIt can be registered using PayPal, Reg.Net or Mail. For details on the terms of our licences and of our Buy-Three-Get-All policy please refer to the FAQ page.

XorIt is a copyrighted work and thus permission is not given for you to decompile, disassemble, modify, translate, enhance or create derivative works from this program. If you feel that you need to do any of those actions, and that those rules do not apply to you, contact us first.

Single User
 
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Reg.Net $8.50 USD Bulk deals are also available here. Buy Now at Reg.Net
  
Mail, Cash $8.00 USD or $10 AUDPostal details in About box
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Mail, Non-Australian Cheque $15 USD
 
Site
 
PayPal $100 USD
 
Reg.Net $100 USD Buy Now at Reg.Net
 
Mail, Cash or Cheque $100 USD or $75 AUDPostal details in About box

Liability

Sinner Computing accepts no liability for this software to the maximum extent allowable by law. Installing this software is the decision of the installer, and signifies that you agree with this liability statement. Thus, any damage/loss caused by the use of this software is not in any way the responsibility of Sinner Computing. This includes, but is not limited to, physical damage and loss of income/time. In no event shall the maximum liability of Sinner Computing exceed the registration fee paid by the user, if any. Because some jurisdictions do not allow the exclusion or limitation of liability for consequential or incidental damages, in such jurisdictions the liability of Sinner Computing shall be limited to the extent permitted by law. If at any time you do not find these conditions agreeable you are required to remove this software.

Contact

Advice/insults (on the subject of the program, not the programmer) are always welcome. To help users keep up to date we send out newsletters whenever there is a major new version of XorIt. To join this list simply send an EMail with "XorADD" in the subject. To be removed from this list, write an EMail with "XorREMOVE" in the subject. (Sinner Computing does not sell your EMail address or any other personal information to anyone.) In addition, we have a RSS feed that is updated whenever there is a new version of any program.

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