Ziar, Riaz Ahmad, 		Irfanullah, Syed, 		Khan, Wajid Ullah, AND 		Salam, Abdus.
" Privacy Preservation for On-Chain Data in the  Permission less Blockchain using Symmetric Key Encryption  and Smart Contract" <em>Mehran University Research Journal of Engineering and Technology</em> [Online], Volume 40 Number 2 (1 April 2021)