Insecurity arising from illegal information flow represents a real threat in small computing environments allowing code sharing, dy- namic class loading and overloading. We introduce a verifier able to cer- tify at loading time Java applications already typed with signatures de- scribing possible information flows. The verifier is implemented as a class loader and can be used on any Java Virtual Machine. The experimental results provided here support our approach and show that the verifier can be successfully embedded. As far as we know, this is the first information flow analysis adapted to open embedded systems.