Publication Type: Journal

1. Publication Category: Internationa Payal Sharma and Purushothama B R, "Cryptanalysis of a secure and efficient Diffie–Hellman based key agreement scheme.", International Journal of Information Technology. [Available online,Scopus indexed] JAN 2023

2. Publication Category: International Payal Sharma, B. R. Purushothama: BP-MGKM: An efficient multi-group key management scheme based on bivariate polynomial. Comput. Networks 216: 109244 (2022)[SCIE indexed] SEPT 2022

3. Publication Category: International 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, pp.2329–2334 , Springer. [Scopus indexed] JUN 2022

4. Publication Category: International 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, pp.165 - 192 MAY 2022

5. Publication Category: International 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] JULY 2021

6. Publication Category: International 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 = 3.872] MAY 2021

7. Publication Category: International 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 = 3.872] MAY 2021

8. Publication Category: International Payal Sharma, Purushothama B R. Security Analysis of Group Key Management Schemes in Wireless Sensor Networks Against IND-SAOA Game. SN Computer Science, Vol. 2, No, 4, pp. 261, 2021.[Scopus indexed] MAY 2021

9. Publication Category: International 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 = 4.152] JAN 2021

10. Publication Category: International Gaurav Pareek and 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, Elsevier. Vol. 54 pp. 102543 [SCIE indexed] JUN 2020

11. Publication Category: International Shravani Mahesh Patil, Purushothama BR. DR-PRE: dual receiver proxy re-encryption scheme. Information Security Journal: A Global Perspective, Volume 29 Issue 2 Pages 62-72 Taylor & Francis. MAR 2020

12. Publication Category: International Shravani Mahesh Patil, BR Purushothama. Non-transitive and collusion resistant quorum controlled proxy re-encryption scheme for resource constrained networks. Journal of Information Security and Applications, Elsevier, Volume 50. FEB 2020

13. Publication Category: International Gaurav Pareek and 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, Springer. Vol. 44 Issue 12. pp. 235:1-235:17 DEC 2019

14. Publication Category: International Gaurav Pareek and Purushothama B R. “Blockchain-Based Decentralized Access Control Scheme for Dynamic Hierarchies”. International Journal of Information and Computer Security. (Accepted for publication, in Press). JAN 2019

15. Publication Category: International Shravani M. Patil and B. R. Purushothama, On the Security of Combinatorial Design Based Group Key Management Scheme, Journal of Information System Security. Vol. 15 Issue 2, pp. 101-116. [Scopus indexed] 2019

16. Publication Category: International Gaurav Pareek and B R Purushothama. Proxy Re-encryption based Provably Secure Group Key Management Scheme with Constant Public Bulletin Size and Key Derivation Time. Sadhana, Springer. Vol 43, Issue 9, 2018. pp. 137-149. JULY 2018

17. Publication Category: International Gaurav Pareek, Purushothama B R, "Provably secure group key management scheme based on proxy re-encryption 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 = 1.188] JULY 2018

18. Publication Category: International B R Purushothama and 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, Issue 1, 2017. pp. 1-31 2017

19. Publication Category: International Nishat Koti and B R Purushothama. Group Oriented Encryption with Constant Rekeying Cost. Security and Communication Networks, Vol 9. Issue 17, 2016, pp. 4120-4137. 2016

20. Publication Category: International Purushothama, B. R., and B. B. Amberker. "Provably secure public key cryptosystem with limited number of encryptions for authorised sharing of outsourced data." International Journal of Cloud Computing (IJCC), Vol. 4, No. 4, 2015: 317-334. JUN 2015

21. Publication Category: International 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, pp. 735-756, June 2013.[SCIE indexed] JUN 2013

22. Publication Category: International Purushothama B R,Shrinath B, B B Amberker, Secure cloud storage service and limited proxy re-encryption for enforcing access control in public cloud, International Journal of Information and Communication Technology vol.5, No.2, pp. 167-186, 2013 [Scopus indexed] JUN 2013

23. Publication Category: International Purushothama B R, B B Amberker Secure group key management scheme for simultaneous multiple groups with overlapped memberships using binomial key tree with new approach to key distribution and key computation, International Journal of Trust Management in Computing and Communications Vol.1, No.2, pp. 175-198,2013 JUN 2013

24. Publication Category: International Purushothama B R, B B Amberker, Duplication with Trapdoor Sensitive Attribute Values: A New Approach for Privacy Preserving Data Publishing, Elsevier Procedia Technology, Vol.6 NIT Rourkela, pp. 970-977, 2012 OCT 2012

25. Publication Category: International 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. Accepted for publication, currently in press, Inderscience Publishers. [Scopus indexed, Accepted]

26. Publication Category: International Payal Sharma and Purushothama B R, "User Driven General Framework to Cap the Joins in Secure Group Communication.", International Journal of Information and Computer Security. (Accepted for publication, in Press). [Scopus indexed]

Publication Type: Proceedings

1. Publication Category: International Payal Sharma, BR Purushothama. Analysis of Traditional Secure Group Key Management Schemes in Secure Multi-group Communication. 2020 International Conference on Communication and Signal Processing (ICCSP) Pages 195-199 IEEE JULY 2020

2. Publication Category: International Gaurav Pareek and Purshothama 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. ACM, 2019. JAN 2019

3. Publication Category: International Shravani Mahesh Patil and Purshothama B R. "RSA-Based Collusion Resistant Quorum Controlled Proxy Re-encryption Scheme for Distributed Secure Communication." In Proceedings of the 15th International Conference on Distributed Computing and Internet Technology (ICDCIT’19), pp. 349-363. Springer LNCS, 2019. JAN 2019

4. Publication Category: International Gaurav Pareek, and Purushothama B R. "Proxy Re-Encryption Scheme for Access Control Enforcement Delegation on Outsourced Data in Public Cloud." In Proceedings of the 14th International Conference on Information Systems Security (ICISS’18), pp. 251-271. Springer (LNCS), 2018. JAN 2019

5. Publication Category: International Gaurav Pareek, and Purushothama B R. "A Provably Secure Re-encryption-Based Access Control in Hierarchy." In Proceedings of the 5th International Conference on Advanced Computing, Networking, and Informatics (ICACNI’17), pp. 97-104. 2018. JUN 2018

6. Publication Category: International Sagar, P. R., Chakra, J. P. S., and Purushothama, B. R. "Pixel Position Based Efficient Image Secret Sharing Scheme." In Proceedings of the 5th International Conference on Advanced Computing, Networking, and Informatics (ICACNI’17), pp. 527-533. 2018. JUN 2018

7. Publication Category: International Gaurav Pareek and Purshothama B R. "Efficient Strong Key Indistinguishable Access Control in Dynamic Hierarchies with Constant Decryption Cost." In Proceedings of the 11th International Conference on Security of Information and Networks (SIN’18), pp. 10:1-10:7. ACM, 2018. 2018

8. Publication Category: International Sarvesh Sawant, Gaurav Pareek and B R Purushothama, Group Key Management Schemes under Strong Active Adversary Model: A Security Analysis, In Proceedings of 6th International Symposium on Security in Computing and Communication (SSCC’18) 19-22 September, 2018. (Accepted for publication) 2018

9. Publication Category: International Gaurav Pareek and B R Purushothama, A Proxy Visible Re-encryption Scheme with Application to Email Forwarding, In Proceedings of 10th International Conference on Security of Information and Networks, 2017 (SIN 2017), Manipal University Jaipur and MNIT Jaipur, October 13-15, 2017, pp. 212-217. [Adjudged BEST PAPER of the conference] OCT 2017

10. Publication Category: International B R Purushothama, Arun Prakash Verma, and Abhilash Kumar. Security Analysis of Key Management Schemes Based on Chinese Remainder Theorem under Strong Active Outsider Adversary Model. In Proceedings of 5th International Symposium on Security in Computing and Communication (SSCC’17), Manipal, Karnataka, India, September 13-16, 2017, pp. 215-225. SEPT 2017

11. Publication Category: International Sarvesh Sawant, Gaurav Pareek and B R Purushothama. A Ringer-based Throttling Approach to Mitigate DDoS Attacks. In Proceedings of 5th International Symposium on Security in Computing and Communication (SSCC’17), Manipal, Karnataka, India, September 13-16, 2017, pp. 95-108. SEPT 2017

12. Publication Category: International Ashwini Choudhari, Gaurav Pareek and B R Purushothama, Security Analysis of Centralized Group Key Management Schemes for Wireless Sensor Networks under Strong Active Outsider Adversary Model. In Proceedings of 7th International Conference on Advances in Computing, Communications and Informatics (ICACCI), 2017, Manipal Karnataka, India, September 13-16, 2017, pp. 1576-1581 SEPT 2017

13. Publication Category: International B R Purushothama and Arun Prakash Verma, Security Analysis of Group Key Management Schemes of Wireless Sensor Network under Active Outsider Adversary Model. In Proceedings of 7th International Conference on Advances in Computing, Communications and Informatics (ICACCI), 2017, Manipal Karnataka, India, September 13-16, 2017, pp. 988 - 994. SEPT 2017

14. Publication Category: International Gaurav Pareek and B R Purushothama, On Efficient Access Control Mechanisms in Hierarchy using Unidirectional and Transitive Proxy Re-encryption Schemes, In Proceedings of 14th International conference on Security and Cryptography (SECRYPT’17), Madrid, Spain, July 24-26, 2017, pp. 519-524 JULY 2017

15. Publication Category: International Chandrasekhar Kuruba, Kethzi Gilbert, Prabhav Sidhaye, Gaurav Pareek, B R Purushothama, Outsource-Secured Calculation of Closest Pair of Points, In Proceedings of 4th International Symposium on Security in Computing and Communications, Springer, September 21-24, 2016, pp. 377-389. SEPT 2016

16. Publication Category: International Nishat Koti and B R Purushothama, Dynamic Access control in a hierarchy with constant key derivation cost, In Proceedings of Advanced Computing, Networking, and Informatics (ICACNI - 2016 ), Springer, NIT Rourkela, September 21-24, 2016, pp. 161-169. SEPT 2016

17. Publication Category: International Purushothama B R and B B Amberker, Polynomial Construction and Non-Tree Based Efficient Secure Group Key Management Scheme, Third International Symposium on Security in Computing and Communications (SSCC), Springer, pp 122-133, 2015. AUG 2015

18. Publication Category: International Ronak Vyas, Alok Singh, Jolly Singh, Gunjan Soni, B. R. Purushothama, Design of an Efficient Verification Scheme for Correctness of Outsourced Computations in Cloud Computing, Third International Symposium on Security in Computing and Communications (SSCC-2015) - SSCC'15 Special Session on Cloud Security and Cryptography, 2015. AUG 2015

19. Publication Category: International Nishat Koti, Esha Keni, Krithika, Purushothama B R,Non-tree Based Group Key Management Scheme With Constant Rekeying and Storage Cost, ACM Third International Symposium on Women in Computing and Informatics (WCI-2015), pp. 564-572, 2015. AUG 2015

20. Publication Category: International Purushothama B R, Nishat Koti, Security Analysis of Tree and Non-tree Based Group Key Management Schemes Under Strong Active Outsider Attack Model, Fourth International Conference on Advances in Computing, Communications and Informatics (ICACCI) , pp 1825-1829, 1025. AUG 2015

21. Publication Category: International Purushothama B R, B B Amberker, On the Security of Group-based Proxy Re-encryption Scheme Cryptology ePrint Archive Report 2013/456, 2013 NOV 2013

22. Publication Category: International Purushothama B R, B B Amberker, Efficient Hierarchical Key Management Scheme Based on Polynomial Construction, International Symposium on Security in Computing and Communications (SSCC-13), pp 191-202, August 22-24, 2013. Mysore, August 2013 AUG 2013

23. Publication Category: International Purushothama B R, B B Amberker, Provable Data Possession Scheme with Constant Proof Size for Outsourced Data in Public Cloud, Second International Workshop on Cloud Computing & Identity Management (CloudID 2013), Mysore, 1662 - 1667,August 2013, AUG 2013

24. Publication Category: International Purushothama B R, B B Amberker, Secure Group Key Management Scheme Based on Dual Receiver Encryption System, 2013 ACM Asia Public-Key Cryptography in conjunction with 8th ACM Symposium on Information, Computer and Communications Security (ASIACCS 2013), pp. 45-50, Hangzhou, China, May 2013 MAY 2013

25. Publication Category: International Purushothama B R, B B Amberker, Efficient Query Processing on Outsourced Encrypted Data in Cloud with Privacy Preservation, International Symposium on Cloud and Services Computing (ISCOS), NIT, Surathkal,pp.88-95, Dec 2012 [Best Paper Award] DEC 2012

26. Publication Category: International Purushothama B R, B B Amberker, Publicly Auditable Provable Data Possession Scheme for Outsourced Data in the Public Cloud Using Polynomial Interpolation, International Conference on Security in Computer Networks and Distributed Systems (SNDS-2012), CCIS- Springer, Vol. 335, IIITM-Kerala, pp. 11-22, 2012 OCT 2012

27. Publication Category: International Purushothama B R, Kusuma Shirisha ,B B Amberker, Secure Group Key Management Scheme for Simultaneous Multiple Groups with Overlapped Memberships Using Binomial Key Tree, International Conference on Security in Computer Networks and Distributed Systems (SNDS-2012), CCIS- Springer, Vol. 335, IIITM-Kerala, pp. 135-146, 2012 OCT 2012

28. Publication Category: International Purushothama B R, B B Amberker, Group key management scheme for simultaneous multiple groups with overlapped membership, International Conference on Security in Computer Networks and Distributed Systems (SNDS-2012), CCIS- Springer, Vol. 335, IIITM-Kerala, pp. 11-22, 2012 OCT 2012

29. Publication Category: International Purushothama B R, B B Amberker, Access control mechanisms for outsourced data in cloud, Fourth International Conference on Communication Systems and Networks (COMSNETS 2012), Bangalore, pp. 1-10, 2012 JAN 2012

30. Publication Category: International Purushothama B R, B B Amberker, Group key management scheme for simultaneous multiple groups with overlapped membership, Third International Conference on Communication Systems and Networks (COMSNETS 2011), Bangalore, pp. 1-10, 2011 JAN 2011

31. Publication Category: International Purushothama B R, Alwyn Roshan Pais, Design and implementation of secure internet based voting system with user anonymity using identity based encryption system, 6th IEEE International conference on services computing, Bangalore, pp. 474-481, 2009 AUG 2009

32. Publication Category: National Purushothama B R, Alwyn Roshan Pais, Secure Internet Based Voting System, eINDIA 2009 , Hyderabad, 2009 (Poster Presentation) AUG 2009

1. Ph. D scholar: Gaurav Pareek (awarded) Thesis title: Cryptographic Solutions for Secure Sharing of Outsourced Data

2. Ph.D Scholar: Payal Sharma (Joined:July-2018)

3. Ph.D Scholar: Ankit Chouhan (Joined:July-2021)

4. Gurunath (Joined: July 2021)

5. Pooja Dalvi (Co-Guide: Joined July 2021)

SERB sponsored project (Project No: ECR/2015/000428) titled “Development of Secure Key Management Protocols for Group Communication Under Active Outsider Attack Model”. Grant: Rs. 15,00,000. Role: Principle investigator.

IEEE - Member

ACM- member

Cryptology Research Society of India (CRSI)-Life Member