Md. Abdullah Al Rahat Kutubi, Kazi Md. Rokibul Alam, Rafaf Tahsin, G. G. Md. Nawaz Ali, Peter Han Joo Chong, Yasuhiko Morimoto, Vol. 11, No.5, May 31, 2017
10.3837/tiis.2017.05.018

• Electronic payment system
• RSA
• Untraceable blind signature
• Digital signature

Long D. Tran, Thu D. Tran, Deokjai Choi, Thuc D. Nguyen, Vol. 10, No.6, June 30, 2016
10.3837/tiis.2016.06.021

• Cryptography
• RSA cryptosystem
• semigroup
• ring.