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Cloud computing eliminates the need for local hardware, addressing the challenge of high computing expenses. However, entrusting data to the cloud may pose the risk of unintentional data loss. Using multiple copies and multi-cloud servers is promising because even if the data on one cloud storage server is compromised, the data proprietor can retrieve the information from alternate cloud storage servers. To protect data security, data needs to be encrypted before uploading to the cloud. However, users cannot directly confirm whether their encrypted documents and copies are stored securely and ...

When data security is facing growing threats, ordinary encryption techniques cannot meet the needs of comparing, sharing, and classifying data hidden in ciphertexts. At the same time, the advent of the quantum computing era has brought unprecedented challenges to traditional cryptography. Fortunately, a lattice-based PKEET scheme can solve the above problems. In this paper, we design a lattice-based PKE-DET scheme that can support the delegated tester function with satisfying anti-quantum computing security and resisting OMRA attacks. To the best of our knowledge, this is the first PKE-DET sch...

It is tricky to determine whether two ciphertexts contain the same message when the messages are encrypted with different public keys. public key encryption with equality test (PKEET) addresses this problem without decryption. By integrating PKEET with identity-based encryption, identity-based encryption with equality test (IBEET) simplifies the certificate management in PKEET. In this paper, we first propose an IBEET scheme that can resist offline message recovery attacks (OMRA) and requires neither the dual-tester setting nor the group mechanism. With the help of some mathematical assumption...

The rise of cloud computing is driving the development in various fields and becoming one of the hot topics in recent years. To solve the problem of comparing ciphertexts between different users in cloud storage, Public Key Encryption with Equality Test (PKEET) was proposed. In PKEET, a tester can determine whether two ciphertexts encrypted with different public keys contain the same message without decrypting the ciphertexts. However, PKEET only supports exact matching, which may not be practical when two messages have misspellings, formatting differences, or differences in the data itself. T...

Abstract A signcryption, which is an integration of a public key encryption and a digital signature, can provide confidentiality and authenticity simultaneously. Additionally, a signcryption associated with equality test allows a third party (e.g., a cloud server) to check whether or not two ciphertexts are encrypted from the same message without knowing the message. This application plays an important role especially in computing on encrypted data. In this paper, we propose the first lattice-based signcryption scheme equipped with a solution to testing the message equality in the standard mo...