德国Steganos公司出的免费软件，可以像一个记事本那样打开，输入要加密的文本，加上密码，存为一个可执行文件，以后要看加了密的文本，就必须输入密码。

Steganos公司是一个安全公司，杀毒软件是让卡巴斯基做的OEM，自己做了一些加密类和网络类的安全软件，软件质量应该是有保障的。

以下是官方网页上的介绍：


Why use Steganos LockNote?

Store your most valuable notes as a LockNote
  Hide your serial numbers, passwords, phone numbers and everyday notes in a safe place. Your informations will be encrypted using a password and most modern AES 256bit encryption technology.
Secure, yet simple
  Just double-click a LockNote and enter your password to access your text files as usual.
No installation required
  Move LockNotes wherever you want, as often as you want. A LockNote document does not require much more hard drive space than an unencrypted document.
Encrypt existing text files in no time at all
  Simply drag and drop existing text files on a LockNote window: they will be encrypted automatically.
Open and free
  LockNote is open source and is based upon open source technologies, e.g. the certified CryptoPP program library for strong encryption.