{ "general_desc": "More than two thousand years old, cryptology has never been more used than it is today. With the development of new technologies, state and military communications are no longer the only ones that need to be secured. This website offers experiments in the field of cryptology. It allows the user to become familiar with some fundamental properties of cryptology.", "vigi_desc": "Considered unbreakable for almost 300 years, the Vigenère cipher uses poly-substitution encryption. Each letter of the text is replaced by a character according to its relative position with respect to the encryption key. This exercise allows, on the one hand, to encrypt a text and, on the other hand, to decipher messages. It gives the opportunity to understand the functioning of Vigenère, in a step by step fashion and gives the general principles that allow an attack (cryptanalysis).", "alea_desc": "Producing a truly random sequence of bits can be more difficult than one can imagine. This is however a necessary step, especially to create symmetric encryption keys. This experiment tests human capabilities to produce a truly unpredictable bit chain.", "btn_access": "Access the tool" }