This book constitutes the thoroughly refereed post-conference proceedings of the 20th International Conference on Information Security Applications, WISA 2019, held on Jeju Island, South Korea, in August 2019.

Show me your Account: Detecting MMORPG Game Bot Leveraging Financial Analysis with LSTM.- Turn On the Lights: User Behavior in Game Environment Using CPTED.- QR Code Watermarking for Digital Images.- FSF: Code Coverage-Driven Fuzzing for Software-Defined Networking.- DroPPP: A P4 Approach to Mitigating DoS Attacks in SDN.- A Secure and Self-Tallying E-Voting System Based on Blockchain.- An Extended CTRT for AES-256.- A Blind Ring Signature Based on the Short Integer Solution Problem.- A Note on the Invisibility and Anonymity of Undeniable Signature Schemes.- Zero-Knowledge Proof System for Fully Anonymous Attribute Based Group Signatures from Lattices with VLR.- Catching the Phish: Detecting Phishing Attacks Using Recurrent Neural Networks (RNSS).- CAPTCHA Image Generation Using Style Transfer Learning in Deep Neural Network.- A New Password Cracking Model with Generative Adversarial Networks.- Reversible Data Hiding in Homomorphic Encrypted Images Without Preprocessing.- Model Selection for Data Analysis in Encrypted Domain: Application to Simple Linear Regression.- Timed-Release Encryption with Master Time Bound Key.- Is it Possible to Hide My Key into Deep Neural Network.- RC PUF: A Low-Cost and an Easy-to-Design PUF for Resource-Constrained IoT Devices.- On the Automation of Security Testing for IoT Constrained Scenarios.- Cyber Deception in the Internet of Battlefield Things: Techniques, Instances, and Assessments.- Secret Sharing on Evolving Multi-Level Access Structure.- Strengthened PAKE Protocols Secure Against Malicious Private Key Generator.- Efficient Decentralized Random Commitment Key Generation for Mixnet Shuffle Proof.- Ring-LWE on 8-bit AVR Embedded Processor.- Low-Noise LLC Side-Channel Attack with Perf.- Optimized SIKE Round 2 on 64-bit ARM.- Shedding Light on Dark Korea: An In-Depth Analysis and Profiling of the Dark Web in Korea.- An SGX-Based Key Management Framework for Data Centric Networking.- Zero-Knowledge Proof System for Fully AnonymousAttribute Based Group Signatures from Lattices with VLR.