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CrypTEA - portable file and folder encryption

There are many fantastic tools out there, both free and commercial. We tried most of them, but none fit our exact requirements for: portability (no installation, no registration codes, no activation) fair play and privacy (no backdoors, and you don’t know who really has access to your data in Cloud) small size, single exe file, no drivers, no special permissions, no dependencies on .Net, no dependencies on third party crypto libraries etc... filename encryption (many tools will just add an extension to the encrypted file, but keep its name plainly readable), easy view and search the original names in Explorer-Like interface while still being encrypted to the outside world, simple access to individual encrypted files (not large volume archive like TrueCrypt which makes quick copying or archiving difficult), ability to work with a backup software or Cloud (individual files are easy to backup, copy and use instead of big archives) etc.. recovery record embedded in the files itself to help with transition or disk errors. Many encryption tools ignore this part for archiving. (available in the full version) zero trace image and text viewer and editor (available in the full version) Many of the existing security tools have few of these features but not all of them. How secure is the Encryption? CrypTEA uses Multi-layered encryption schemes in a block chain mode with high quality random IV generator. As with any modern encryption algorithms the passwords simply can’t be mathematically extracted from the encrypted file itself. The CrypTEA encrypted files will look like a random noise when observed in a binary editor, the files do not have any header or any single recognizable point of entry. If you encrypt two exact copies of the same file with the exact same password, both of the encrypted files will be 100% different from each other - an easy test for high quality encryption. As with any modern cryptography, your password is the single weakest point, not the encryption. (For example can it be guessed? Is it short so it can be brute forced by trial and error?) Does the software include any backdoors, “ad-ware” or other unwanted things? Absolutely not. This is a tool that was developed for our own use and one of the reason for making our own encryption tool was that we know for sure there are no backdoors. On how many computers can I install/copy the full version? The full version is sold as Household License, which means you are free to use it on each and every of your household computers without limitation. There is also no activation or registration code (after registration you get an access link and password to download the full version) This simplifies the process and keeps the application fully portable as you don’t have to worry about remembering registration codes etc. Can the Password be Recovered if lost? No it cannot. The password is not stored anywhere, it cannot be reversed from the data and there is no mechanism to decrypt the files without correct password. So if you lose your password, that’s it. You have a cool collection of a random noise. What is the difference between the full and free version? The difference table is on the Overview page. The full version includes Secure text and image viewers, recovery record etc... What is Secure Text editor and Secure Image preview? (Full Version) The CrypTEA full version has build-in internal secure text editor and image viewers for most common formats, including animated gifs. While using windows image preview or text editor require the file to be decrypted somewhere first (an obvious security risk), the internal editor and viewer works directly on the encrypted file in the memory. No traces of decrypted files are stored on the host computer. Additionally the internal text editor can save changes back to encrypted file - so it is ideal for keeping quick notes such as web site passwords, credit card numbers etc... How does the recovery record works? (Full Version) A common disadvantage of all encrypted files (and also compressed files such as zip or rar) is their higher vulnerability to transmission or disk errors. A single flipped bit somewhere means the file can’t be decrypted or decompressed at all. So we added an optional recovery record block that can be attached to each of the encrypted file. If the file gets partially damaged because of the transmission or disk error there is a good chance the file can be restored back to the original encrypted state. This has little overhead as the recovery is set to be less than 1% of encrypted data. This is usually enough to fight most probable file failures that spans across few disc sectors. The recovery record has no security risks because it is generated from the ENCRYPTED data. That means a damaged encrypted file can be recovered only into undamaged encrypted file. But you still need the password to decrypt it. Should I use recovery record on all files? (Full Version) You can use recovery record mostly on encrypted files that could not be easily replaced if damaged or are not regularly backed up. For example there is not much need to add recovery record on encrypted files if an easy access to their backup exist (source code with regular backup, images with existing backup etc). On the other hand if the encrypted files are used as the backup itself for example in the cloud, it would be wise to put a recovery files which will increase the chance of successful recovery if the drive fails. Are the encrypted files compatible between free and full version Yes, you can encrypt in one and decrypt in the other and vice versa. Copying Encrypted folders/files to the media (USB, NAS, Cloud) Because the file names are encrypted as well, it is not always easy to determine certain file or folder names in Windows Explorer. In CrypTEA Explorer, enter your password in the Tools->Enter Password and you will be able to see the readable file names. Copy by Drag and Drop: You can now drag and drop the files from the list to the Windows Explorer Copy/Paste. In CrypTEA, right click on any folder (in the tree or in the list) and select Copy. Then in your Windows Explorer navigate to the destination, right click and select Paste. Note: With both methods the encrypted versions will be copied over to the destination (the copy operations will not decrypt them) Also the software has been specifically designed to be able to encrypt/decrypt files on the NAS or USB media directly. What is the Integrity Test This is mostly used during development, but can be used by users to make sure that the encryption/decryption scheme works. Simply open any folder in the CrypTEA Explorer and use the Integrity Test. One-by-one a copy of all the files in the folder and sub-folders will be encrypted, then decrypted and the decrypted file will be bit-by-bit compared with the original. Obviously the files should be the same. If not then the software would be worthless. We run it through gigabytes of data and it is safe function as it never changes the original data. Is there a limit for a single file size? The CrypTEA was developed to handle hundreds of thousands of small files - such as our development code for storage and archival on NAS and Cloud where we can easily and quickly decrypt any part. There is a 4GB hard limit for a single file in the CrypTEA because it doesn’t make much sense to encrypt such huge single chunks of data. CrypTEA will simply skip any file that is > 4GB. This is only a set limitation to avoid accidentally encrypting TrueCrypt, ISO and other large backup archives that may be on discs. What is the difference between CrypTEA file/folder encryption and volume encryption such as TrueCrypt or BitLocker The goal of CrypTEA is to have immediate random access to thousands of encrypted files and folders and assure their easy portability and backup. For example you can copy or move only some of the CrypTEA encrypted files and folders elsewhere, including the USB memory, SD card, NAT drives or Cloud (and they still stay encrypted). On the other hand a virtual file/volume encryption such as TrueCrypt or BitLocker creates one very large file volume which makes them non-portable and non-archival from the practical point of view (they span into multiples of GB) and mostly impossible or impractical to use in the Cloud. Simple Versioning and Static names CrypTEA was developed initially  for in-place encryption. You can use it for backup encryption where you have few options. By default each time you encrypt files they will be generated with different randomized encrypted file name. This together with the Keep file date attributes (full version) can work as a quick and simple versioning backup - that means you can keep adding new encrypted versions of the same file to the backup folder and they will not overwrite the old ones. Keep file date will allow to differentiate between the versions. This may be not necessary be what you want and for this reason an option to set the Random Filenames to OFF was added. The files will be then always generated with the same encrypted file name, thus allowing you to replace the old encrypted files with the new ones. Note: There is no actual relationship between encrypted file names and the password used to encrypt the content of the file How is CrypTEA portable CrypTEA is distributed as installation, but it works as portable application as well. There are couple of options: you can simply take only the EXE file from the installed directory (free or full version) without any other DLL files and copy it as a portable file to USB drive etc…. All functionality will be preserved, except the internal video and audio player copy the exe and all dll files - this will also allow you to have your own portable multimedia player for video and audio files. Audio and Video playback Full version of CrypTEA allows you to directly play encrypted video and audio files. The player is asynchronous (or streaming) so it will start playing quickly without waiting for the file to be entirely decrypted. CrypTEA Video Player will start playing the encrypted while it is still being decrypted. The video scroll bar will show “buffering” text as the video is being played. It is similar to the way files are streamed over the network. Very few video formats such as WMV need to be decrypted in full as they are not able to stream, in which case CrypTea will have to wait until the whole video is decrypted before playing.
Overview | FAQ

CrypTEA FAQ

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Lifetime Whole Household License
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Universal Site License
Portable Version
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Free version is for personal use only
After buying the license you will receive the link and a pass code to download the unrestricted FULL CrypTEA application. The full version works without any need to enter registration code so it remains fully portable. It is licensed for the whole household - as many computers as you have.
Site license will allow an organization to use CrypTEA on all and every computers within their organization. It is a worldwide license - that means it is not restricted to a single company location.
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