An online security service called CryptoHeaven is Mac OS X compatible, even though the platform is not “officially supported.”
Touted as a free service, CrytoHeaven promises: secure e-mail; secure online storage, file sharing, and file distribution; security instant messaging; no third party keyholder; automatic key and contact management. All services are said to be integrated and available from a single user interface. The folks at CryptoHeaven say that no personal info (names, addresses, credit card numbers, etc.) is required for the service.
The company says they use “only the finest in cryptography,” including an AES symmetric Rijndael cipher with 256 bit symmetric key, public-key cryptography with 2048-4096 bit a symmetric keys, and SHA-256 message digest function.
The CryptoHeaven Web site offers a Mac OS X compatible version (a 1.6 MB download), although the service disclaims official support for it.