The 8-volume set LNCS 16245-16252 constitutes the refereed proceedings of the 31st International Conference on the Theory and Application of Cryptology and Information Security, ASIACRYPT 2025, which took place in Melbourne, Australia, during December 8-12, 2025.

The 143 full papers included in the proceedings were carefully reviewed and selected from 533 submissions. These papers were organized into the following topical sections: Symmetric Cryptography; Cryptanalysis; Mathematic Aspects of Symmetric Cryptography; Secure Messaging; Formalization and Key Exchange; Data Structures; Blockchain; Secure Implementations; Design and Analysis of Implementations; Lattices; Post-Quantum Signatures; Groups and Group Actions; Isogenies; Multivariate Cryptanalysis and Code-based Crypto; Secure Computation; Succinct Proofs; Encryption with Advanced Features; Signatures with Advanced Features; Threshold Cryptography; Fully Homomorphic Encryption; Verifiable Computation; Pseudorandom Correlation; Secret Sharing; Quantum; and Foundations.