The existence of Internet of Things (IoT) facilitates the collection and transmission of urban data information. However, it can leak\nusersâ?? personal privacy information in smart cities. Therefore, we propose a new private information encryption method in IoT\nunder cloud computing environment. Under IoT, according to the properties and acquisition time, privacy information can be\ndivided into many subspaces. Then, we analyze the private information encryption with different levels. Based on the stream\ncipher mechanism, we design an encryption system model of information collection. In the subspace, the privacy information is\nencrypted and transferred to the relay node. After encrypting, they are segmented and restructured. The long privacy\ninformation is divided into smaller slices. Then, they are reintegrated after conversion. Finally, we use stream cipher and dualkey\nalgorithm to complete freedom nondestructive transformation between plaintext and ciphertext to ensure the integrity of\nthe encrypted private information. Experimental results show that the proposed method takes less time in the encryption and\ndecryption process, which has better ciphertext conversion output effect and suffers fewer network attacks in the same\nencryption time. The message encryption and decryption time is less than that of other methods. In terms of calculation cost,\nthe proposed method decreases by approximately 14%. What is more, it has higher security and improves the security and\nintegrity of the privacy information collection process.
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