Cryptography is the use of codes and ciphers to keep information secret. There are records showing cryptography has been used for thousands of years. Historically, cryptography methods primarily involved the use of pen and paper encryption or simple mechanical aids. For example, clay tablets found in Mesopotamia dating from 1500 BC had an encrypted recipe for pottery glaze. And Hebrew scholars were using substitution ciphers as far back as 500 or 600 BC.
In modern times, the ability to send encrypted messages has been of vital importance during war efforts. For example, the US recruited and trained Navajo “code talkers” during World War II. Other examples that can be used are the phone password, bank account password, macbook password, or the personal information that is very important.
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