From: A detailed evaluation of format-compliant encryption methods for JPEG XR-compressed images
Method | Key space |
---|---|
Coefficient scan order permutation (CSOP) | M n i ! |
Sign bits encryption (SBE) | k |
Random level shift encryption (RLSE) |
|
Transform based encryption (TBE) | 16M |
Encryption of frequency bands (EEFB) | k |