Coercion is the practice of forcing another party to act in an involuntary manner by use of intimidation or threats or some other form of pressure or force. In this book, we inspect the properties required to protect the privacy of transmitted data in a coercive environment. Consider for example a military coup authority that records the encrypted data transmitted to/from a suspected dissentients. When enough suspicion is accumulated and a suitable court order is obtained the suspect is required to reveal the cleartexts that correspond to the ciphertexts recorded by the authority along with...