The project aims at developing new photonic transmitters for quantum cryptography applications which could be used to increase the security of communication networks. The transmitter will be designed to generate security keys at a speed up to 100 Mb/s, two orders of magnitude larger than the state-of-the-art sources. The whole transmitter, with the optical and electronic parts integrated, will have a reduced size and power consumption. In addition, space-qualified optoelectronic devices will be used, so that the final prototype will be ready for satellites and future European Space Agency (ESA) missions.