International Association for Cryptologic Research

International Association
for Cryptologic Research

CryptoDB

Mohammad Amin Raeisi

Publications

Year
Venue
Title
2025
CIC
Building a BBB Pseudorandom Permutation using Lai-Massey Networks
Ritam Bhaumik Mohammad Amin Raeisi
<p> In spite of being a popular technique for designing block ciphers, Lai-Massey networks have received considerably less attention from a security analysis point of view than Feistel networks and Substitution-Permutation networks. In this paper we study the beyond-birthday-bound (BBB) security of Lai-Massey networks with independent random round functions against chosen-plaintext adversaries. Concretely, we show that five rounds are necessary and sufficient to achieve BBB security. </p>