Quantum Research Retreat in Tenerife - Spain (2018) The idea of this meeting is to discuss about the newest techniques using quantum algorithms. The meeting is focused in develop new attacks and/or to use encryption with quantum algorithms. In 2016, we gave an introduction talk about quantum algorithms and quantum walks. Furthermore, we gave some other ideas for attacks and how to deal with some problems that quantum algorithms raise, e.g., reversible and unitary operations.