Exploiting sensitivity of nonorthogonal joint diagonalisation as a security mechanism in steganography

We have recently proposed the framework of independent blind source separation as an advantageous approach to steganography. Amongst the several characteristics noted was a sensitivity to message reconstruction due to small perturbations in the sources. This characteristic is not common in most other approaches to steganography. In this paper we discuss how this sensitivity relates the joint diagonalisation inside the independent component approach, and reliance on exact knowledge of secret information, and how it can be used as an additional and inherent security mechanism against malicious attack to discovery of the hidden messages. The paper therefore provides an enhanced mechanism that can be used for e-document forensic analysis and can be applied to different dimensionality digital data media. In this paper we use a low dimensional example of biomedical time series as might occur in the electronic patient health record, where protection of the private patient information is paramount.

Working together to protect crowded places:a consultation document

Aims to help local partners understand their role and the contributions they can make to reducing the vulnerability of crowded places at risk to terrorist attack by incorporating counter terrorist protective security advice into their existing work to improve community safety. Provides advice about how risk will be assessed and local performance managed and explains the roles of key partners in delivering reductions in the vulnerabilities of crowded places to terrorist attack.