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The famous « padlock » appearing in browsers when one visits websites whose address is preceded by « https » relies on cryptographic primitives that would not withstand a quantum computer. This integrated project aims to develop in 5 years post-quantum primitives in a prototype of « post-quantum lock » that will be implemented in an open source browser. The evolution of cryptographic standards has already started, the choice of new primitives will be made quickly, and the transition will be made in the next few years. The objective is to play a driving role in this evolution and to make sure that the French actors of post-quantum cryptography, already strongly involved, are able to influence the cryptographic standards of the decades to come.