This book constitutes the refereed proceedings of the 11th International Conference on Security, Privacy, and Applied Cryptography Engineering, SPACE 2021, held in Kolkata, India, in December 2021. This annual event is devoted to various aspects of security, privacy, applied cryptography, and cryptographic engineering.

Symmetric Cryptography.- Computing the Distribution of Differentials over the Non-linear Mapping .- Light-OCB: Parallel Lightweight Authenticated Cipher with Full Security.- LP Based Differential Attack on Round Reduced WARP.- Post-quantum cryptography and homomorphic encryption.- SHELBRS: Location-Based Recommendation Services using Switchable Homomorphic Encryption.- On Threat of Hardware Trojan To Post-Quantum Lattice-based Schemes: A Key Recovery Attack on SABER and beyond.- Safe-Error Attacks on SIKE and CSIDH.- Hardware security and side-channel attacks.- Network Data Remanence Side Channel Attack on SPREAD, H-SPREAD and Reverse AODV.- Parasite: Mitigating Physical Side-channel Attacks against Neural Networks.- Reinforcement Learning-based Design of Side-channel Countermeasures.- Deep Freezing Attacks on Capacitors and Electronic Circuits.- AI and Cloud security.- Encrypted SQL Arithmetic Functions Processing for Secure Cloud Database .- RobustnessAgainst Adversarial Attacks using Dimensionality.- SoK - Network Intrusion Detection on FPGA.