1. Payal Sharma and Purushothama B R, “Generalization of multicast encryption for Internet of Things deployment", Journal of Information Security and Applications, Vol. 77, 2023, pp. 103571, Elsevier. [SCIE indexed, IF = 5.6]
2. Payal Sharma and Purushothama B R, “BP-MGKM: An efficient multi-group key management scheme based on bivariate polynomial”, Computer Networks, Vol. 216, 2022, pp. 109244, Elsevier. [SCIE indexed, IF = 5.6]
3. Gaurav Pareek and Purushothama B R, “KAPRE: Key-aggregate proxy re-encryption for secure and flexible data sharing in cloud storage”, Journal of Information Security and Applications, Vol. 63, 2021, pp. 103009, Elsevier. [SCIE indexed, IF = 5.6] 
4. Shravani Mahesh Patil, Purushothama B R, “Pixel Co-Ordinate-Based Secret Image Sharing Scheme with Constant Size Shadow Images”, Computers and Electrical Engineering, Vol. 89, pp. 106937, 2021, Elsevier, DOI: 10.1016/j.compeleceng.2020.106937. [SCIE indexed, IF = 4.3]
5. Payal Sharma and Purushothama B R, “User-driven General Framework to Cap the Joins in Secure Group Communication”, Int. J. of Information and Computer Security, Accepted, currently in press, Inderscience Publishers. [Scopus indexed, IF =0.437]
6. Payal Sharma and Purushothama B R, “A Lightweight Group Key Management Scheme With Constant Rekeying Cost and Public Bulletin Size, Information Security Journal: A Global Perspective", pp. 1-24, Taylor and Francis, DOI: 10.1080/19393555.2023.2198737. [ESCI indexed, IF=1.8]
7. Payal Sharma and Purushothama B R, “Cryptanalysis of a secure and efficient Diffie–Hellman based key agreement scheme”. International Journal of Information Technology, Vol. 15, 2023, pp. 981–989, Springer. [Scopus indexed]
8. Shilpee Prasad and Purushothama B R, “Secure and Verifiable Outsourcing of Euclidean Distance and Closest Pair of Points with Single Untrusted Cloud Server”, International Journal of Internet Protocol Technology, Vol. 16, No. 1, 2023, pp. 34-45, Inderscience Publishers. [Scopus indexed]
9. Payal Sharma and Purushothama B R, “Securing polynomial based group key management scheme against strong active adversary model”, International Journal of Information Technology, Vol. 14, 2022, pp. 2329–2334, Springer. [Scopus indexed] 
10. Shravani Mahesh Patil, Purushothama B R, “QC-PRE: Quorum Controlled Proxy Re-encryption Scheme for Access Control Enforcement Delegation of Outsourced Data”, International Journal of Information and Computer Security, Vol. 18, No. 1-2, 2021, pp. 165–192, Inderscience Publishers. [Scopus indexed, IF=0.437]
11. Gaurav Pareek and Purushothama B R, “Secure and Efficient Revocable Key-Aggregate Cryptosystem for Multiple Non-Predefined Non-Disjoint Aggregate Sets”, Journal of Information Security and Applications, Vol. 58, 2021, pp. 102799, Elsevier, DOI: 10.1016/j.jisa.2021.102799. [SCIE indexed, IF = 5.6]
12. Shilpee Prasad and Purushothama B R, “CCA Secure and Efficient Proxy Re-Encryption Scheme Without Bilinear Pairing”, Journal of Information Security and Applications, Vol. 58, 2021, pp. 102703, Elsevier, DOI: 10.1016/j.jisa.2020.102703. [SCIE indexed, IF = 5.6]
13. Gaurav Pareek and Purushothama B R, “TP-PRE: Threshold Progressive Proxy Re-Encryption, Its Definitions, Construction and Applications”, Journal of Ambient Intelligence and Humanized Computing, Vol. 12, No. 4, 2021, pp. 1943-1965, Springer, DOI: 10.1007/s12652-020-02285-4. [SCIE indexed, IF =7.104]
14. Gaurav Pareek and Purushothama B R, “Blockchain-Based Decentralized Access Control Scheme for Dynamic Hierarchies”, International Journal of Information and Computer Security, Vol. 16, No. 3-4, 2021, pp. 324-354, Inderscience Publishers. [Scopus indexed, IF=0.437]
15. Gaurav Pareek, Purushothama B R, “Proxy Re-Encryption for Fine-Grained Access Control: Its Applicability, Security Under Stronger Notions and Performance”, Journal of Information Security and Applications, Vol. 54, 2020, pp. 102543, Elsevier, DOI: 10.1016/j.jisa.2020.102543. [SCIE indexed, IF = 5.6]
16. Shravani Mahesh Patil, Purushothama B R, “DR-PRE: Dual Receiver Proxy Re-Encryption Scheme”, Information Security Journal: A Global Perspective, Vol. 29, No. 2, 2020, pp 62-72, Taylor and Francis, DOI: 10.1080/19393555.2020.1715515. [ESCI indexed, IF=1.8]
17. Shravani Mahesh Patil, Purushothama B R, “Non-Transitive and Collusion Resistant Quorum Controlled Proxy Re-Encryption Scheme for Resource Constrained Networks”, Journal of Information Security and Applications, Vol. 50, 2020, pp. 102411, Elsevier, DOI: 10.1016/j.jisa.2019.102411. [SCIE indexed IF = 5.6]
18. Gaurav Pareek, Purushothama B R, “Extended Hierarchical Key Assignment Scheme (E-HKAS): how to efficiently enforce explicit policy exceptions in dynamic hierarchies”, Sadhana – Academy Proceedings in Engineering Sciences, Vol. 44, No. 12, 2019, pp. 235:1-235:17, Springer, DOI: 10.1007/s12046-019-1216- 8. [SCIE indexed, IF = 1.8]
19. Shravani M Patil, Purushothama B R, “On The Security of Combinatorial Design Based Group Key Management Scheme”, Journal of Information System Security, Vol. 15, No. 2, 2019, pp. 101-116. [Scopus Indexed]
20. Gaurav Pareek, Purushothama B R, “Provably secure group key management scheme based on proxy reencryption with constant public bulletin size and key derivation time”, Sadhana – Academy Proceedings in Engineering Sciences, Vol 43, No. 9, 2018, pp. 137:1-137:13, Springer, DOI: 10.1007/s12046-018-0917- 8. [SCIE indexed, IF = 1.6]
21. Purushothama B R, B B Amberker, “Access control mechanisms for outsourced data in public cloud using polynomial interpolation and multilinear map”, International Journal of Cloud Computing, Vol. 6, No. 1, 2017, pp. 1-31, Inderscience Publishers, DOI: 10.1504/IJCC.2017.083901. [Scopus Indexed]
22. Koti Nishat, Purushothama B R, “Group-oriented encryption for dynamic groups with constant rekeying cost”, Security and Communication Networks, Vol. 9, No. 17, 2016, pp. 4120-4137, Wiley Publishers, DOI: 10.1002/sec.1593. [SCIE indexed, IF = 1.791][Open access since 2017.]
23. Purushothama B R, B B Amberker, “Secure group and multi-layer group communication schemes based on polynomial interpolation”, Security and Communication Networks, Vol. 6, No. 6, 2012, pp. 735-756, Wiley Publishers, DOI: 10.1002/sec.607. [SCIE indexed, IF =1.791] [Open access since 2017]
24. Purushothama B R, B B Amberker, “Provably secure public key cryptosystem with limited number of encryptions for authorised sharing of outsourced data”, International Journal of Cloud Computing, Vol. 4, No. 4, 2016, pp. 317-334, Inderscience Publishers, DOI: 10.1504/IJCC.2015.074244. [Scopus indexed]

Conference Publications (selected)

1. Gaurav Pareek and Purushothama B R, “A Practical and Efficient Key-Aggregate Cryptosystem for Dynamic Access Control in Cloud Storage”. The 20 th International Conference on Distributed Computing and Intelligent Technology (ICDCIT-2024) [Accepted, Scopus indexed.]
2. Shrutika Ithape, Purushothama B R,“Identification of Encryption Method for Block Ciphers using Machine Learning Methods",20th India Council International Conference (INDICON) - 2023 [Accepted, Scopus indexed.]
3. Payal Sharma, Purushothama B R, “Why Traditional Group Key Management Schemes Don’t Scale in Multi-group Settings?, In: 4th International Conference on Frontiers in Computing and Systems (COMSYS-2023), 16th - 17th October 2023, Indian Institute of Technology Ropar India, Accepted. [Scopus indexed]
4. Gaurav Pareek and Purushothama B R, “Flexible cryptographic access control through proxy re-encryption between groups”. In Proceedings of the 20th International Conference on Distributed Computing and Networking (ICDCN ’19), pp. 507-507, 4 Jan, 2019, Association for Computing Machinery, New York, NY, USA, 507. [Scopus indexed]
5. Shravani M Patil, Purushothama B R, “RSA-based collusion resistant quorum controlled proxy reencryption scheme for distributed secure communication”, In: International Conference on Distributed Computing and Internet Technology[ICDCIT], pp. 349-363, 10 to 14 January 2019,
6. Kalinga Institute of Industrial Technology, Bhubaneswar, India, LNCS Springer. DOI: 10.1007/978-3-030-05366-6_29 [Scopus indexed]
7. Gaurav Pareek, Purushothama B R, “A Provably Secure Re-encryption-Based Access Control in Hierarchy”, In: International Conference on Advanced Computing, Networking, and Informatics, pp. 97-104, 1 to 3 June 2017, NIT Goa, India, Springer. DOI: 10.1007/978-981-10-8639-7_10 [Scopus indexed]
8. Gaurav Pareek, Purushothama B R, “Efficient strong key indistinguishable access control in dynamic hierarchies with constant decryption cost”, 11th International Conference on Security of Information and Networks, pp. 1-7, 10 to 12 Sep 2018, Cardiff University, UK, ACM. DOI:10.1145/3264437.3264480 [Scopus indexed]
9. Gaurav Pareek, Purushothama B R, “Proxy re-encryption scheme for access control enforcement delegation on outsourced data in public cloud”, In: 14th International Conference on Information Systems Security, pp. 251-271, 17 to 19 Dec 2018, IISc Bangalore, India, LNCS Springer. DOI: 10.1007/978-3-30-05171-6_13 [Scopus indexed]
10. Nishat Koti, Purushothama B R, “Dynamic Access control in a hierarchy with constant key derivation cost”, In: International Conference on Advanced Computing, Networking, and Informatics (ICACNI -2016), pp. 161-169, September 21-24 2016, NIT Rourkela, India, Springer. DOI: 10.1007/978-981-10-3376-6_18 [Scopus indexed]
11. Gaurav Pareek, Purushothama B R, “Proxy Visible Re-Encryption Scheme with Application to Email Forwarding”, In: 10th International Conference on Security of Information and Networks, (SIN ’17), pp. 212-217 October 13-15, 2017, Manipal University Jaipur. DOI: 10.1145/3136825.3136906 [Scopus indexed, Adjudged BEST PAPER of the conference ]
12. Gaurav Pareek, Purushothama B R, “On Efficient Access Control Mechanisms in Hierarchy using Unidirectional and Transitive Proxy Re-encryption Schemes”, In: 14th International conference on Security and Cryptography (SECRYPT), (ICETE 2017-Volume 4: SECRYPT),
13. Madrid, Spain, pp. 519-524, July 24-26, 2017. DOI: 10.5220/0006466405190524 [Scopus indexed]
14. Chandrasekhar Kuruba, Kethzi Gilbert, Prabhav Sidhaye, Gaurav Pareek, Purushothama B R, “OutsourceSecured Calculation of Closest Pair of Points”, In: 4th International Symposium on Security in Computing and Communications, pp. 377-389, September 21-24, 2016, LNMIIT Jaipur, India, CCIS Springer. DOI: 10.1007/978-981-10-2738-3_33 [Scopus indexed]
15. Purushothama B R, B B Amberker, “Secure group key management scheme based on dual receiver cryptosystem”, In: ACM workshop on asia public-key cryptography, pp. 45-50, 8 to 10 May, 2013, Hangzhou, China, ACM. DOI: 10.1145/2484389.2484399 [Scopus indexed]
16. Purushothama B R, B B Amberker, “Access control mechanisms for outsourced data in cloud”, In: Fourth International Conference on Communication Systems and Networks (COMSNETS 2012), pp. 1-2, 3 to 7 Jan 2012, Bangalore, India, IEEE. DOI: 10.1109/COMSNETS.2012.6151367 [Scopus indexed]
17. Purushothama B R, B B Amberker, “Efficient query processing on outsourced encrypted data in cloud with privacy preservation”, In: International Symposium on Cloud and Services Computing, pp. 88-95, 17 to 18 Dec 2012, NITK Surathkal, Mangalore, India, IEEE. DOI: 10.1109/ISCOS.2012.16 [Scopus indexed]
18. Purushothama B R, B B Amberker, “Group key management scheme for simultaneous multiple groups with overlapped membership”, In: 2011 Third International Conference on Communication Systems and Networks (COMSNETS 2011), pp. 1-10, 4 to 8 Jan 2011, IEEE. DOI: 10.1109/COMSNETS.2011.5716429[Scopus indexed]