“…For processing physiological information of users in WBSNs, various inside-body authentication schemes have been proposed [ 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 ]. In [ 14 , 15 ], the inter-pulse interval of Electrocardiogram (ECG) and Photoplethysmogram (PPG) have been used to generate cryptographic keys for encryption and authentication.…”