Secrecy can exist in a number of different ways: encoding or encryption (where mathematical and technical strategies are used to hide messages), true secrecy (where restrictions are put upon those who take part of the message, such as through government security classification)[citation needed] and obfuscation, where secrets are hidden in plain sight behind complex idiosyncratic language (jargon) or steganography.
Another classification proposed by Claude Shannon in 1948 reads that there are three systems of secrecy within communication:[1] Animals conceal the location of their den or nest from predators.
[3] A commonly used[citation needed] narrative that describes this kind of behavior is Joseph Conrad's short story "The Secret Sharer".
[4] Few people dispute the desirability of keeping Critical Nuclear Weapon Design Information secret, but many believe government secrecy to be excessive and too often employed for political purposes.
While voting, citizens are acting in a unique sovereign or "owner" capacity (instead of being a subject of the laws, as is true outside of elections) in selecting their government servants.
[citation needed] Organizations, ranging from multi-national for profit corporations to nonprofit charities, keep secrets for competitive advantage, to meet legal requirements, or, in some cases, to conceal nefarious behavior.
[citation needed]New products under development, unique manufacturing techniques, or simply lists of customers are types of information protected by trade secret laws.
[6] In particular, scholars in economics and management have paid attention to the way firms participating in cartels work together to maintain secrecy and conceal their activities from antitrust authorities.
[citation needed] Shell companies may be used to launder money from criminal activity, to finance terrorism, or to evade taxes.
[8] Other laws require organizations to keep certain information secret, such as medical records (HIPAA in the U.S.), or financial reports that are under preparation (to limit insider trading).
[citation needed] Military secrecy is the concealing of information about martial affairs that is purposely not made available to the general public and hence to any enemy, in order to gain an advantage or to not reveal a weakness, to avoid embarrassment, or to help in propaganda efforts.
[11] US Government rights in regard to military secrecy were uphold in the landmark legal case of United States v. Reynolds, decided by the Supreme Court in 1953.