Overview
What is CryptIt?
CryptIt is designed to use conventional XOR encryption on keys that are the same size as the file to be encrypted. CryptIt also has a ability to use removable media (USB drives, CDs, floppies) as a key code book.
In depth
A closer look at CryptIt
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!) CryptIt 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. CryptIt can also generate key files (from a stream cipher and thus not best for OTP usage) and analyse the suitability of your own files for key usage.
Verdict
Should you download CryptIt?
CryptIt runs on
Windows 9X/ME/2K/XP/2003
and is available under the
Shareware
license
— the installer is 33 KB.
We’ve catalogued it under
Security and Access Control.
✓
Verified clean. Every CryptIt build on SoftLookup is scanned for viruses, spyware, adware, trojans and backdoors. We re-test on every update.
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At a glance
CryptIt specifications
- Last updated
- Mar 12, 2025
- License
- Shareware
- Operating system
- Windows 9X/ME/2K/XP/2003
- File size
- 33 KB
- Price
- $7.5
- Page views
- 422
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