Free crypto software for windows

Crypto Chat is a little Java application which will allow two parties to chat to each other over a direct TCP/IP connection with ridiculously high levels of encryption which is all done in the background automatically - no central server or key management hassle required.

Wuul Crypto Text 1.9.2 is described as a convenient-to-use as well as helpful cryptographic text editor which can encrypt any piece of text for you and place it into an output window where it can be easily copied to the clipboard. This can be useful if you want to encrypt a piece of text and send it in an email, for example you do realize that the person you send it to will need a copy of Wuul Crypto Text as well as the password used.

Requirements: Windows 95/98/Me/NT/2000/XP/2003 Server/Vista

Crypto-Lock is a File Protector that allows you to restrict access to your executable files Crypto-Lock helps you encrypt your files.
The password is not stored in the resultant file. The password you entered during encryption is processed with SHA-1 if it is less than 36 characters long.
The resultant key is then used to encrypt either part of the
file (minimum encryption) or the whole file (maximum encryption).
For both encryptions, the part to be encrypted is compressed first
to deter cryptoanalysis. With the random values used in CBC mode,
the encrypted file produced everytime is different for the same
original file using the same password.
The output of the Crypto-Lock will either be a self-decrypting file (SDF) or an encrypted module (*.pri). Think of Crypto-Lock as a secure safe that lets you carry sensitive information around and can be unlocked only with the correct password.
Crypto-Lock is written with 2 aims in mind:
1. To prevent unauthorised running of your programs (executable files)
2.To prevent unauthorised access to your other files
1.Crypto-Lock can encrypt your executable files and the resultant file will not run unless the correct password is entered. There are two methods of encrypting an executable file to choose from.
Minimum encryption:
Only the important area of the file is encrypted (ie. the PE header)
Maximum encryption:
The whole file is encrypted.
The reason why we have 2 encryption options is that the aim for this particular function is to prevent unauthorised access of your executable files and not for security. But if your executable is really sensitive, you have the option of fully encrypting it so that no one can use a hex editor to peek at your file.
Maximum encryption takes a longer time to encrypt and decrypt. So, use it only if it is really necessary.
(On PII 350MHz computer, a 5.45MB file took about 45 mins for the maximum encryption option to produce a 1.66MB file. But although it took a long time to compress, the time needed for decompression and decryption was about 2 seconds! )
Note: It is almost impossible to extract a working version of the executable file from a file encrypted with minimum encryption. And it took just 2 seconds to fully protect the file!
When the correct password is entered, the executable file is decrypted and then decompressed and will be activated. On exiting the program, the decrypted file will be written over before being deleted and thus, it will not be recoverable by conventional means. On computers with recycle bin protectors, the file that is recovered will not be the decrypted one.
2.Crypto-Lock encrypts your other files using only maximum encryption regardless of your choice. The reason is, in this case, security is the main reason why Crypto-Lock is used. The encrypted file will not be decrypted unless the correct password is entered. Since the file is not an executable, it will not be activated nor will it be deleted after decryption.
Main features:
- Drag and Drop
- Original file can be backed up
- Shell extension is available for the encrypted modules (*.pri)
- Decrypted executables are activated automatically and are overwritten and deleted after they are closed.

Win Crypto Chat 4.4 is developed as a useful and handy software with which you can easily chat over TCPIP using an utterly paranoid level of encryption. Uses ridiculously long AES and RSA keys, all automatically generated. Nice simple interface and source included. Java and Windows versions available. You can also send files over the encrypted connection.

Enhancements: Includes unspecified updates.

PlainText Crypt application lets you encrypt your text files into a sequence of digits. To encode and decode some text, the special key files are used.
Every key file is unique and cannot be generated again. The encoded text cannot be restored without having a key file that had been used for encoding.
PlainText Crypto may be also helpful for those who need to send secured texts via email. The encryption algorithm is stable against breaking and encoded texts are effectively protected.