MCT Service
 
NoteSafe
 
A Text Editor like Notepad using
Strong Cryptography with TwoFish Technology
 
FAQ
 

What is NoteSafe?
Why is it called NoteSafe?
What is TwoFish?
How do I use a pass phrase?
How do I get the security I need?
How do I recover a lost key?
NoteSafe home page

Q:  What is NoteSafe?
A:  NoteSafe is a text editor that has many features in common with NotePad. You can open, edit, print, and save files. The font style and size can be selected for the entire document, but not for selected text within the document. Like NotePad, you can open, edit, print, and close small text files (*.TXT) that are readable by anybody. What makes NoteSafe unique is that it allows you to work with files that have been encrypted on your hard drive. Encryption scrambles the data on the disk so that nobody can tell what you have written. Files stored on the hard drive this way are called TwoFish files (*.TFH). This is because the TwoFish encryption algorithm is used to scramble the information. The TFH file extension tells you that no ordinary text editor can read them. It takes NoteSafe to decrypt the files so you can see the contents, edit, print, and save them again. 

NoteSafe runs under Windows 95, 98, NT, Win2K, and XP.

NoteSafe is shareware, and must be registered if you want to continue using the software beyond thirty (30) days.

Q:  Why is it called NoteSafe?
A:  It is called NoteSafe because it is like putting your notes in a safe.

Q:  What is TwoFish?
A:  TwoFish is a block cipher developed by Counterpane Systems. It is their candidate for the new Advanced Encryption Standard (AES). It is one of the five finalists chosen by NIST from a field of 15 candidates.

Q:  How do I use a pass phrase?
A:  In order to keep the files secret, you need to provide a pass phrase that only you know. Give the pass phrase to NoteSafe by selecting the Key, Pass Phrase command..

The pass phrase dialog will appear. Just type in your secret pass phrase and press the OK button. The pass phrase is case sensitive. So, be careful about using upper case and lower case. If you do not use exactly the correct pass phrase neither you nor anybody else will be able to recover your files.

It is important to select a good pass phrase. It should be simple for you to remember, but hard for anybody else to guess. If you write the pass phrase down, somebody may find it and be able to read your files. No software can provide any protection if this happens. If you forget the pass phrase, you will not be able to read your files. That is why selecting your pass phrase is so important. 

Q:  How do I get the security I need?
A:  When you use NoteSafe to save your documents as .TFH files, they are encrypted using strong cryptography. The files on your disk will not be readable by anybody. After you supply a pass phrase NoteSafe will be able to decrypt the files and display all of the information in them. 

By default NoteSafe will ask you to enter the pass phrase each time you run the program. You may also ask NoteSafe to save an encrypted copy of the pass phrase on your hard drive when you exit the program. It then reads and decrypts the pass phrase the next time you load the program. This makes it easy for you to always read your encrypted files, but also makes it easy for other people with access to your computer to read your files. 

You should think about what kind of security you need. Are you only encrypting files to send to others? Do you just want to keep curious co-workers or family from reading your files? Do you have very sensitive information that needs to be protected from determined thieves? Do you need to protect your data from high powered government computers? You can set up NoteSafe to provide various levels of security, depending on how you answer these questions. Read what Bruce Schneier has to say about various threats.

From the Key menu, you can check the Save Key and/or Lock Key items. The various combinations provide various levels of security.

Save Key
Lock Key
When the program exits, the pass phrase is encrypted and saved on disk. When the program loads the next time, the pass phrase is loaded again so that you will not have to enter it to access your files. Because the key is not locked, anybody with access to the computer can also change the pass phrase. Use this option when your computer is physically secure from access by others, you are testing the software, or you are just encrypting files to send to others.
Save Key
Lock Key
Just like the option above, these options save an encrypted pass phrase on the hard drive. When the program loads the next time, the pass phrase is loaded again so that you will not have to enter it to access your files. This gives anybody with physical access to your computer immediate access to your encrypted files. Because the key is locked, nobody can change the pass phrase until the exact pass phrase is entered again.
Save Key
Lock Key
The pass phrase is not saved for you, and must be entered to access your files. NoteSafe locks out all users until the identical pass phrase is entered again. This is the way that a normal password works on a computer. Nobody - including you - can get to your files until the same pass phrase is entered again. 
Save Key
Lock Key
This is the default and most secure option. The encrypted pass phrase is not saved on your hard drive. Anybody who runs NoteSafe will need to enter a pass phrase in order to open or save encrypted files. If you have saved files with a pass phrase, that exact phrase must be used to read your files. This option provides you the maximum security and should be used if it is absolutely necessary to keep others from reading your files. If you enter an incorrect pass phrase, the opened file will appear to have scrambled characters. Immediately close the file, enter the correct pass phrase, and open the file again.

When entering a pass phrase, there is a checkbox labeled Hide. When you check this option, the pass phrase will not be visible as you type it in. This is handy if people are looking at your computer screen while you are typing. Uncheck the box if you want to read the pass phrase while typing.

Q:  How do I recover a lost key?
A:  If you lose or forget your pass phrase, it can not be recovered. Carefully select your pass phrase so that you will not forget it. If you have locked the pass phrase and forget it, re-register using your registration name and number with the File, Register command. Be sure to check the checkbox labeled "Clear saved and / or locked pass phrase", and the saved or locked pass phrase will be cleared.


MCT Service NoteSafe
sales@mctservice.com
support@mctservice.com