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Abstract

Embodiments relates to a method for encrypting a 3D object (O) defined at least by a set of first points (p_i) and a set first of faces (F), contained in a bounding box (B), the method being executed by an encryption device and comprising: determining (S4) a set of second points (p_si) by bijection of the set of first points (p_i), and a second set of faces (F_s), determining (S5) an encrypted 3 D object (O_s) defined at least by the set of second points (p_si) and the second set of faces (F_s), wherein the first points (p_i) are associated with respective first indexes (i), the second points (p_si) are associated with respective second indexes (s_j), and a face is specified by a list of indexes, wherein the encrypted 3D object (O_s) is contained in said bounding box (B), the method further comprising: partitioning the bounding box (B) into a set of first sub-boxes (n_j), determining a set of second sub-boxes (n_sj) by bijection of the set of first sub-boxes (n_j), in function of a secret key (k), wherein the position of a second point (p_si) is (c) determined in function the position of the corresponding first point (p_i), the position of the first sub-box (n_j) containing the corresponding first point, and the position of the second sub-box (n_sj) corresponding with said first sub-box (n_j).

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First Claim