Chandrasekaran A. Secure cryptographic communication using ultrasound audio for frictionless payment transactions and secure conversations over a short-range human audible/inaudible spectrum. Int J Sci Rep [Internet]. 2023 Jul. 7 [cited 2026 Jun. 1];9(8):248-50. Available from: https://www.sci-rep.com/index.php/scirep/article/view/1246