“…On the other hand, Excel B. Villanueva et al [32] implemented the fifth version of the same block cipher to be implemented for e-payment purposes. The TEA cipher is another block cipher algorithm that is considerably utilized, especially for healthcare applications [22,29,38], due to its low resource usage and healthcare applications' real-time information requirement. ECC can be seen as widely used, as in [14,39], where this approach was implemented alongside several techniques such as the Digital Signature Algorithm (DSA), SHA-256, and CRC, and it can be part of a blockchain-based e-payment application with no consensus, since the users are initially verified [23], or zero-knowledge-based cryptography within Schnorr's scheme [33].…”