On 30 August 1998, the Mail on Sunday, under the headline "TB refugee 'must be held in hospital"', described the case of a Somalian man who had been "ordered by a court to remain in hospital for six months to prevent him spreading a highly infectious deadly disease". That disease was tuberculosis and a court order had been issued "after the man had twice staggered into Northwick Park Hospital i...

The paper cryptanalyses a new public key cryptosystem that has been recently proposed by Paeng, Ha, Kim, Chee and Park [5]. The scheme works on finite non-abelian groups. We focus on the group SL(2, ZZp)×θ ZZp which was discussed in [5] extensively.

Medium Field Equations (MFE), which is a type of multivariate public key encryptions scheme proposed by Wang et al., was broken by Ding et al. using high order linearization equation (HOLE) attack. Recently, many people attempt to modify the second order matrices structure in the central map of MFE to resist HOLE attack. In this paper, we gave deeply analysis of all possible constructions by pr...