Post-quantum signatures are digital signatures that can be run on classical computers but with the promise of being secure even for adversaries with a quantum computer. The quantum computer being close to reality has urged the world to start standardization processes for stadardizing post-quantum signatures. This project aims at aiding this process by providing new cryptanalytic methods and techniques for scrutinizing the proposed designs and improving the confidence in the security of the chosen standards. It will help evaluate both the security of the algorithms and the security of their physical implementations and propose appropriate countermeasures.