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The prosperity of Internet of Things (IoT) has brought numerous advantages to individuals and organizations. Since the transmission channel is usually considered as untrusted, the notion of signcryption seems to be the desired method to ease the defect. Nevertheless, this primitive inevitably faces the new obstacle that how to search the required data without decrypting it. Therefore, inheriting the excellence of signcryption and equality test, we present a heterogeneous signcryption protocol supporting the equality test from public key infrastructure (PKI) to certificateless cryptosystem (CLC) toward IoT environment (PK‐CLET). In this way, the introduced construction not only preserves the integrity, confidentiality and unforgeability of data, but also allows the cloud server to perform the equality test on different ciphertexts. Moreover, the security of PK‐CLET as well as the performance evaluation are both shown that it is more suitable for IoT.

In recent years, the research of Internet of vehicles (IoV) has received extensive attention. In IoV, vehicles can make intelligent decisions by exchanging the real‐time traffic information between other vehicles and IoV infrastructures, thereby reducing the probability of traffic jams and accidents. Although IoV has many advantages, it is necessary to ensure that the data are not edited, forged, or disclosed during the transmission. Also, the certificateless signature (CLS) seems to be the solution to this problem. While in the high‐intensity data transmission environment, the CLS scheme is inefficient for application. To improve the efficiency, the function of aggregation was introduced into the CLS. The certificateless aggregate signature (CL‐AS) can aggregate multiple signatures into a brief signature, reducing the computational cost and the size of signature. Nevertheless, most of the recent proposed CL‐AS schemes have problems of security or efficiency. In this paper, we presented an advanced efficient CL‐AS scheme with elliptic curve cryptography for the IoV environment. In addition, the proposed scheme uses pseudonyms in communications to prevent vehicles from revealing their identity. We proved the security of our proposal in the random oracle based on computational Diffie‐Hellman assumption. Also, the efficiency analysis and simulation show the superiority of our scheme.

With the rapid development of the Internet of Vehicles, a great amount of vehicles are connected to Internet of Vehicles environment. These vehicles can exchange data to each other and upload the data to a cloud server for backup. Since the data contains some sensitive information, it is necessary to encrypt the data before uploading to the cloud server. However, this method severely hampers the utilization of data because of the tremendous difficulty in the search for encrypted data. For addressing the above issue, we propose a novel certificateless public key encryption supporting the equality test on ciphertexts that are performed by the cloud server while revealing nothing about the corresponding plaintexts. Our scheme has proved to be secure in bilinear Diffie‐Hellman assumption under the model of random oracle. At the same time, both theoretical analysis and experimental evaluation indicate the security, efficiency, as well as effectiveness of the proposed scheme.