It is simple to use, fast, and offers very high cryptographic security. It is available in native versions for 68k Macs and PowerMacs as well as in a FAT version and requires MacOS 7.0 minimum. Tresor is shareware. The registration fee is 20 Euro. Tresor encrypts any file using the IDEA block encryption algorithm.
Encryption uses self-selected passwords.
For decryption, the same password that was used for encryption will be needed again. Ascom Systec Ltd. By paying the registration fee, you automatically acquire the right to use the IDEA algorithm with Tresor. Thanks to IDEA , Tresor offers the highest level of cryptographic security and protects your confidential documents from unauthorized inquisitive eyes. Great people who make the program, ask them anything and they will help you out.