Efficient Compression and Encryption for Digital Data Transmission

Table 11

Cost of encryption for two-dimensional data (encryption + compression).

Encryption method	Test set size	Encrypt. Size	Encrypt. + JPEG	Encrypt. + Lossless JPEG	Encrypt. + JPEG2000 (lossless mode)
RC4	8708068	8708068	1894281; (−6813787 b.)	12031804; (+3323736 b.)	9532748; (+824680 b.)
DES	8708068	8708088	1983720; (−6724348 b.)	12036327; (+3328259 b.)	9529660; (+821592 b.)
3DES	8708068	8708088	1983558; (−6724510 b.)	12033974; (+3325906 b.)	9529591; (+821523 b.)
AES	8708068	8708096	1978988; (−6729080 b.)	12034622; (+3326554 b.)	9528145; (+820077 b.)