Nowadays, three-dimensional (3D) printing technology is applied to many areas of life\nand changes the world based on the creation of complex structures and shapes that were not feasible\nin the past. But, the data of 3D printing is often attacked in the storage and transmission processes.\nTherefore, 3D printing must be ensured security in the manufacturing process, especially the data of\n3D printing to prevent attacks from hackers. This paper presents a security solution for 3D printing\nbased on two-dimensional (2D) slices encryption. The 2D slices of 3D printing data is encrypted in\nthe frequency domain or in the spatial domain by the secret key to generate the encrypted data of 3D\nprinting. We implemented the proposed solution in both the frequency domain based on the Discrete\nCosine Transform and the spatial domain based on geometric transform. The entire 2D slices of 3D\nprinting data is altered and secured after the encryption process. The proposed solution is responsive\nto the security requirements for the secured storage and transmission. Experimental results also\nverified that the proposed solution is effective to 3D printing data and is independent on the format\nof 3D printing models. When compared to the conventional works, the security and performance of\nthe proposed solution is also better.
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