Cyber technology gives states the ability to accomplish effects that once required kinetic action. These effects can now be achieved with cyber means in a manner that is covert, deniable, cheap, and technologically feasible for many governments. In some cases, cyber means are morally preferable to conventional military operations, but in other cases, cyber's unique qualities can lead to greater mischief than governments would have chanced using kinetic means. This volume addresses the applicability of traditional military ethics to cyber operations, jus ad vim (an emerging sub-field governing grey zone or soft war operations), the rights of the targets of cyber operations, cyber sabotage, cyber surveillance, phase zero operations, psychological operations, artificial intelligence, and algorithmic ethics. Uniquely, it includes a number of cyber incidents that do not currently exist as case studies and have not received much public attention. This volume has been designed to work as a handbook for military and security professionals involved in cyber training, teaching, and application.