This book constitutes the refereed proceedings of the 7th International Conference on Security, Privacy, and Applied Cryptography Engineering, SPACE 2017, held in Goa, India, in December 2017.The 13 revised full papers presented together with 1 short paper, 7 invited talks, and 4 tutorials were carefully reviewed and selected from 49 initial submissions. This annual event is devoted to various aspects of security, privacy, applied cryptography, and cryptographic engineering. This is indeed a very challenging field, requiring the expertise from diverse domains, ranging from mathematics to solid-state circuit design.