The cryptographic algorithms that are officially licensed by the U.S. National Security Agency (NSA) to safeguard confidential information of up to Top Secret level are called military grade encryption. The gold standard is Suite B (currently CNSA Suite), that requires AES-256 to encrypt the data symmetrically and ECC P-384 to exchange keys. Something that is described as military grade encryption should be able to endure the assaults of the nation-state by decades and it will therefore be the standard with the banks, defense contractors and secure messaging apps around the world.
Military time is a simple 24-hour system that removes confusion between AM and PM by using continuous numbering from 0000 to 2359. Morning hours are read as they are, while afternoon times follow a clear pattern that quickly becomes intuitive. For example, 1800 military time directly represents 6:00 PM in everyday standard time. With a bit of practice, this format becomes an easy and reliable way to read schedules accurately.
