Behzad Abdolmaleki, Hamidreza Khoshakhlagh and Helger Lipmaa. Smooth Zero-Knowledge Hash Functions. In Avishek Adhikari, Bart Preneel and Ralf Kusters, editors, Indocrypt 2021, volume ? of Lecture Notes in Computer Science, pages ?–?, Jaipur, India, December 12–15, 2021. Springer, Cham.