Tech Specs

  1. Requires OS X 10.7 or higher

  2. 256-bit AES, CBC, HMAC-SHA256

  3. ZIP compression

  4. Files compatible with the iPod touch, iPhone and iPad App Krypton

  5. Drag and drop operation

  6. Supports files and/or folders

  7. Popular worldwide

Krypton for Mac OS X is a privacy tool that uses strong encryption (256-bit AES, CBC, HMAC-SHA256) to securely protect personal and confidential information resident on your Apple computer. Krypton is not a password manager: it encrypts and decrypts entire documents (text, spreadsheets, images, recipes, anything).

(For OS X 10.5 Leopard or OS X 10.6 Snow Leopard, please use the older, deprecated but free, version, confusingly called KryptonX, available here.)

This new version of Krypton for OS X 10.7 Lion or above is a simple App that has been digitally signed with BigCatOs’ Developer ID certificate, and will thus be accepted by Gatekeeper, the new security mechanism in OS X 10.8 Mountain Lion. The App is available from the Mac App Store.

    Touch the icon for App Store details.

Krypton terminology:

  1. Plaintext refers to any item, whether a text file, image, Word or Pages document, spreadsheet, HTML or sound file, etc., in its normal format.

  2. Ciphertext refers to a plaintext item that has been encrypted, and is thus unrecognizable.

  3. A passcode is a string of words and characters used as a key during encryption and decryption. The only way to decrypt a Krypton item is by knowing the passcode used to encrypt it.

The Vault

Krypton keeps your ciphertext items in a special vault. When the App runs the vault opens automatically and all your ciphertext items are displayed.

To encrypt a file or folder and add it to the vault simply use the File menu’s Add To Vault menu item to select the item to encrypt. After that the passcode sheet slides down so that you can enter and verify your passcode, and optionally shred the original item.

To decrypt a vault item, double-click it, and specify where to save the plaintext. After that the passcode sheet slides down so that you can enter the decryption passcode.


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Examples: encrypting a ZIP file using File / Add To Vault.  Possible Actions once a ciphertext item is stored in the vault (double-clicking a vault item invokes the default action Decrypt):