Security Enhancement for Lightweight JPEG 2000 Transparent Encryption

Abstract

Abstract-We present improvements in lightweight transparent JPEG 2000 encryption with lifting parameterized biorthogonal wavelet filters. Security is further enhanced by a combination with the wavelet packet transform. Different methods for the selection of a suitable wavelet packet basis are presented, which also make a certain amount of control in the trade-off between security and computational complexity possible. The combined approach of parameterized filters and wavelet packets is evaluated with regard to compression performance, complexity and security.

A survey on JPEG2000 encryption

“…The tests show that the range in which the parameterized filters achieve good compression results on the one hand and exhibit sufficient variation to withstand a brute-force attack is rather limited. In [18], Engel and Uhl argue that, because filters vary much more for lower absolute values of α, discretization bins should not be uniform. In order to enlarge the keyspace, they further propose to use different parameters for the horizontal and the vertical wavelet decomposition on different decomposition levels.…”

“…Security Brute-force: It is reported in [18] that for keys of small individual values for all parameters in each direction and each level a brute-force search for the full-quality version remains unsuccessful. However, keys exist where each parameter is of higher absolute value for which the bruteforce attack comes close to the full quality version.…”

A symbolic transform attack on lightweight encryption based on wavelet filter parameterization

“…To overcome this, the used filters are varied for each level of the wavelet transform (non-stationary variation) and for each direction of the wavelet transform (inhomogeneous variation). In [4], the authors further increase keyspace size by a combination of parameterized wavelet filters with the randomized wavelet packet decompositions, at the cost of introducing computational complexity in the transform step. Most of the attacks discussed here can theoretically be applied to any of these extensions, but will increase in computational demands and decrease in precision.…”