I need to protect large (1-5GB) video files (already in ASD). I am using Taifun zip extension with password for files up to 300-400MB, but for bigger files it becomes too slow.
For example I was thinking of an extension with 4 functions:
- reading the first f.e 50 bytes from the file header
- simple "encryption" of 50 bytes (without altering the number of bytes)
- writing 50 bytes to file (replacing first 50 bytes in file header)
- decryption of 50 bytes..
Perhaps there is already another solution or I will be happy to sponsor such an extension.