Abstract
Anonymous multireceiver encryption scheme can not only protect the privacy of the receiver but also ensure the security of message. However, the computational cost of this scheme is very large. It is not suitable for the sender which has limited resources, such as mobile devices and sensor nodes. In this work, an anonymous multireceiver online/offline identity‐based encryption is proposed based on offline/online and identity‐based encryption (IBE). In identity‐based encryption scheme, the sender can encrypt the message using the unique information of the user (such as identity number or e‐mail address) as its public key. The receiver obtains the private key from a central authority. For mobile device with limited resource, the online/offline encryption scheme can reduce the computational cost. Compared to the previous anonymous multireceiver schemes, the proposed scheme can efficiently encrypt message with offline/online method and ensure the anonymity of receivers. The analysis results also show that our scheme is efficient in terms of computational cost by comparing to the previous works.
Highlights
Multireceiver communication [1] is a crucial way to send and receive message
The preparation computation can be done while the mobile device is plugged into a power supply, and when it is on the move without plugging, it performs the encryption operations with little computational cost
An anonymous multireceiver online/offline identity-based encryption was proposed in our work
Summary
Multireceiver communication [1] is a crucial way to send and receive message. It can effectively solve the problem of key management and data sending. The sender/encryptor sends message to a group of users; only the legal uses can decrypt the ciphertext. In order to deal with the privacy of the legal receivers, a really anonymous multireceiver IBE scheme was proposed in [8]. In encryption phase, this scheme requires a number of bilinear pairing operations which is proportional to the number of receivers He et al [10] addressed an efficient certificateless anonymous multireceiver encryption scheme according to elliptic curve cryptography for devices with limited resources. The offline ciphertext which is computed in offline phase can be reused for the same receiver sets This method can reduce the computation cost for the senders when they encrypt the message to the same receive sets.
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