International Journal on Science and Technology

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A Cryptographic Framework for Secure Cloud Data Retrieval Using Certificateless Encryption

Author(s) Kommu Sundara Rao
Country India
Abstract Searchable Public Key Encryption (SPKE) is an important cryptographic technique that enables users to perform keyword searches over encrypted data stored on an untrusted server while preserving the confidentiality of both the data and the search queries. However, many existing SPKE schemes require a secure communication channel and suffer from security vulnerabilities such as keyword guessing attacks. To address these issues, certificate-based cryptography (CBC) has been introduced as an effective public key cryptographic primitive that lies between Identity-Based Cryptography (IBC) and traditional Public Key Cryptography (PKC). In a CBC system, a user first generates a pair of public and private keys independently and then submits identity information along with the public key to a trusted Certificate Authority (CA) to obtain a certificate. Unlike traditional PKI certificates, the certificate in CBC acts as a partial decryption or signing key that is only available to its owner. Consequently, a user must combine the private key and the certificate to perform decryption or signing operations. This mechanism simplifies certificate management, eliminates third-party certificate status verification, and avoids key escrow problems because the CA does not possess the user’s full private key.Searchable Public Key Encryption extends traditional public key encryption by allowing a server to test whether encrypted data contains specific keywords without revealing the underlying plain text or the search keywords.n this paper, we propose a new framework called Certificate-Based Searchable Public Key Encryption (CB-SPKE), inspired by certificate-based cryptography and signcryption techniques. The proposed framework enhances security against keyword guessing attacks while providing advantages such as implicit authentication, elimination of key escrow, and removal of the requirement for secure communication channels. Furthermore, a concrete CB-SPKE scheme is developed and analyzed. Security analysis in the random oracle model demonstrates that the scheme satisfies ciphertext indistinguishability and trapdoor privacy under adaptive keyword attacks. Comparative evaluation shows that the proposed scheme is both secure and practical for real-world applications such as encrypted email systems, secure cloud storage, electronic healthcare systems, and Internet of Things (IoT) environments. Below is a rewritten, well-structured “Proposed System” section suitable for a journal or project report, with clear academic language and supporting diagrams placed where they are most appropriate.
Keywords Cryptographic, Public keyEncription ,Decription, Pravate Key,Certificate Based,Searchbale.
Field Computer Applications
Published In Volume 17, Issue 1, January-March 2026
Published On 2026-03-14
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10.71097/IJSAT

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