Abi Coder can't make your crucial files invisible, but it can make
them unreadable to anyone who lacks the proper decryption keys.
Select a file or folder in Abi-Coder's file-encryption interface,
enter a key word of your choice, and click on the Encrypt
button--your file or folder is scrambled until further notice
(don't forget the key). Abi-Coder offers three levels of
encryption: 168-bit 3DES, 256 AES, and the default: 448-bit
Blowfish, for those who want complete assurance of secrecy.
Abi-Coder also creates self-decrypting files, allowing you to send
encrypted files to friends who know the decryption key.
Too bad it doesn't integrate with Windows Explorer, allowing you
to encrypt and decrypt files wherever you find them. For
unbreakable encryption, the author recommends a key at least 16
characters in length.