"Advances in Cryptology -- ASIACRYPT 2014" is a comprehensive collection of scientific contributions that documents the results of the 20th International Conference on the Theory and Applications of Cryptology and Information Security. This conference took place in December 2014 in Kaohsiung, Taiwan, and attracted numerous contributions from around the world. The two volumes, published as LNCS 8873 and 8874, contain 55 revised full texts and two invited talks, selected from a total of 255 submitted papers. The contributions are organized into thematic sections covering various aspects of cryptology, including authentication, symmetric key analysis, side-channel analysis, and homomorphic cryptography. This collection is a valuable resource for professionals and researchers in the field of cryptology and information security who wish to engage with the latest developments and techniques in this dynamic field.