DCrypt 1.01 for Mac was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. We recommend checking the downloaded files with any free antivirus. The actual developer of this free software for Mac is Jonathan Clark. The most popular version of the tool is 1.0. You can run DCrypt on Mac OS X 10.6.6 or later. DCrypt for Mac lies within Security Tools, more precisely Personal Security.
From the developer:
This is a free app for users who don't own our encryption app NCrypt.
It allows anyone to decrypt a file encrypted with NCrypt provided they have the correct key. In order to correctly decrypt a file the same key which was used to encrypt the file must be entered. Entering an incorrect key will result in an incorrectly decrypted file, the content will be corrupt.
You may want to check out more software for Mac, such as Private Contact or Tiptoe, which might be related to DCrypt.