On a Complete Characterization of Optimal XOR Based Visual Cryptographic Schemes for Non-monotone General Access Structures.
Visited University of Nagasaki, Japan June 22, 2016, and delivered the following Invited Talk on June 22, 2016.The Title of the talk:
India and Indian Mathematics: A Brief Overview.
Visited University of Kyushu, Japan during June 19-21, 2016 as one of the researcher in the Indian Research Team of the Joint Research Project entitled "Computational Aspects of Mathematical Design and Analysis of Secure Communication Systems Based on Cryptographic Primitives", funded by DST-JSPS.
Some efficient constructions of visual cryptographic schemes using linear algebraic techniques: some future research problems.
Visited University of Putra Malaysia (UPM), Malaysia May 27-30, 2014, and presented the following talk at the International Conference and Workshop on Mathematical Analysis 2014 (ICWOMA2014), 27-30, May 2014.
The Title of the talk:
COLOR VISUAL CRYPTOGRAPHIC SCHEMES USING STATISTICAL DESIGNS.
Visited University of Kyushu, Japan August 26-30, 2013 as an invited speaker of the International Conference entitled "Algebraic constructions as a fundamental keystone of a safe and secure society: Mathematics for guaranteeing the reliability of the cyber-society" organized by the Institute of Mathematics for Industry (IMI), Kyushu University during August 26-30, 2013.
The Title of the three invited talks are:
1. Connections Among Algebra, Statistical Designs and Secret Sharing Schemes (on August 27, 2013).
2. Applications of Algebraic Structure in Visual Cryptography (on August 28, 2013).
3. Plaintext Checkable Encryption with Designated Checker (on August 29, 2013).
Visited University of Kyushu, Japan during May 19 to June 6, 2012 as one of the researcher in the Indian Research Team of the Joint Research Project entitled
Visited KDDI R&D Laboratories and had there fruitful discussions with Dr T Tanaka, Senior Manager, Information Security Laboratory, KDDI, Dr K Fukushima and J Kurihara, Associate Research Engineer, Information Security Laboratory, KDDI regarding the efficient implementation of our as well as their schemes of Secret Sharing Schemes.