  Recently, a new and powerful separability criterion was introduced in [O.
Rudolph, quant-ph/0202121] and [Chen {\it et al.}, quant-ph/0205017]. Composing
the main idea behind the above criterion and the necessary and sufficient
condition in terms of positive maps, we provide a characterization of separable
states by means of linear contractions. The latter need not be positive maps.
We extend the idea to multipartite systems, and find that, somewhat
suprisingly, partial realigment (unlike partial transposition) can detect
genuinely triparite entanglement. We also show that for multipartite system any
permutation of indices of density matrix leads to separability criterion.
