• Manthan Kasle
• Raju Kamble
• Ganesh Kandakure
• Kushal Kolambe

Cloud computing, commonly referred to as "the cloud," provides users with instant access to remote servers, networks, and data centers, enabling the analysis of data in a way that is beneficial to society and individuals. However, sharing data with multiple parties can present problems related to efficiency, data integrity, and owner privacy. One potential solution is the use of ring signatures to create an anonymous and trustworthy data-sharing system. For cloud-based analytics, this enables data owners to verify their data anonymously. Identity-based (ID) ring signatures are gaining popularity as an alternative to traditional public-key encryption (PKI), as the time and cost of verifying certificates is a bottleneck in PKI. The research found that encrypting ID-based ring signatures with a variant of SHA-384 and adding forward security significantly increases their security. The padding technique in newer versions of SHA divides the input text into 512-byte blocks and appends the length as a 48-bit number at the end of the hash, which ensures that signatures created with a compromised secret key are still valid. This feature is crucial for large-scale data sharing systems, as it is difficult to require all data owners to re-verify their data if a single user's secret key is compromised. The paper describes a practical and effective implementation of this method, validates its security, and provides a proof of concept. The upgraded SHA-384 approach has proven to be safer for anonymous data exchange in the cloud.

Cloud computing, Remote servers, SHA-384, Forward security, Anonymous data exchange, Valid signatures.

"Enhancing Cost-Effective Anonymous Data Sharing through Improved Authentication", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.10, Issue 5, page no.25-28, May-2023, Available :http://www.jetir.org/papers/JETIRFX06005.pdf

"Enhancing Cost-Effective Anonymous Data Sharing through Improved Authentication", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.10, Issue 5, page no. pp25-28, May-2023, Available at : http://www.jetir.org/papers/JETIRFX06005.pdf