University of Guilan Computational Sciences and Engineering 2783-2503 4 1 2025 04 26 Validation of Returned Results in Asymmetric Searchable Encryption Schemes 79 100 8611 10.22124/cse.2025.29912.1095 EN Arian Arabnouri ​Dep. Of Computer Engineering, University Of Guilan, P.O. Box 3756 Reza Ebrahimi Atani ​Dep. Of Computer Engineering, University Of Guilan, P.O. Box 3756 Shiva Azizzadeh ​Dep. Of Computer Engineering, University Of Guilan, P.O. Box 3756 Journal Article 2025 02 21 As organizations increasingly outsource data to cloud storage, ensuring the security and integrity of this data becomes paramount. Searchable encryption (SE) offers a promising solution by enabling secure searches on encrypted data, thereby preserving privacy and confidentiality. However, existing SE schemes often overlook the issue of data integrity, particularly when the cloud server, an external and potentially untrusted entity, returns invalid or malicious results. This paper proposes a novel technique for validating the results returned by the cloud server in asymmetric searchable encryption schemes. The proposed method introduces minimal efficiency overhead and is easily applicable to existing schemes. By applying this technique to the dPEKS (designated Public Key Encryption with Keyword Search) scheme, we demonstrate a significant reduction in search time while enhancing the ability to validate results across multiple servers. Our approach ensures that the integrity of returned data is preserved, even in scenarios where the cloud server may act maliciously. The proposed technique is particularly effective in private scenarios, such as e-care and banking, where only authorized users can send and retrieve data. This work contributes to the ongoing effort to improve the security and reliability of searchable encryption in cloud environments. https://cse.guilan.ac.ir/article_8611_e0e8667deb6987729b78bc7f07ca2f0f.pdf