Ciphertext duplicate checking and storage method based on homomorphic encryption and Simhash

The invention discloses a ciphertext duplicate checking and storage method based on homomorphic encryption and Simhash. The method comprises the steps of RSA data encryption and decryption, chameleon hash calculation, secret sharing calculation, simhash calculation and homomorphic encryption. Ciphertext state verification can be realized, and the security of the file is enhanced. In the encryption and decryption process and the chameleon hash calculation process, random numbers of an algorithm are deleted, it is guaranteed that ciphertexts are the same after the same file is encrypted, and the same chameleon hash is generated. The file is transmitted to the IPFS to realize distributed storage, and the ipfs performs hash addressing according to content, so that the file can be ensured to correspond to a unique storage address. And the data ciphertext is calculated by using a homomorphic encryption technology, so that the security of the data is ensured. 本发明公开了基于同态加密与Simhash的密文查重与存储方法，包括RSA数据加解密、变色龙哈希计算、秘密共享计算、