Study on Hybrid Encryption Technology of Power Gateway Based on AES and RSA Algorithm

In order to solve the problem of security risks of gateways in complex communication networks of power Internet of Things, this paper proposes a hybrid encryption system that combines AES and RSA to ensure the security of power gateway communication. Aiming at the security risks of S-boxes in AES algorithms, this paper proposes a new pair of irreducible polynomials and affine transformations to construct a new S-box, which solves the problems of short iteration cycle of traditional S- boxes and failure to meet strict avalanche criteria. Aiming at the problem of low computational efficiency of RSA algorithm, this paper changes the double prime number to three prime number, and uses the direct modulo power algorithm and Montgomery modulo multiplication to simplify the large number modulo power operation. Experimental results show that the optimized hybrid encryption can ensure both the operation rate and the security of the system.