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Suetonius reports that Caesar used it with a shift of three to speak together with his generals. Atbash is an example of an early Hebrew cipher. The earliest known use of
cryptography is a few carved ciphertext on stone in Egypt (ca 1900 BCE), but this might are finished the amusement of literate observers rather than as a way of concealing information.
The main classical cipher types are transposition ciphers, which rearrange the order of letters during a message (e.g., 'hello world' becomes 'ehlol owrdl' during a trivially simple rearrangement scheme), and substitution ciphers, which systematically replace letters or groups of letters with other letters or groups of letters (e.g., 'fly at once' becomes 'gmz bu podf' by replacing each letter with the one following it in the Latin alphabet). Simple versions of either haven't offered much confidentiality from enterprising opponents. An early substitution cipher was the Caesar cipher, during which each letter within the plaintext was replaced by a letter some fixed number of positions further down the alphabet.
Basically large numbers of people who suffer with head injuries are basically children.
Mainly the signs and symptoms of sickle cell disease usually begin in early childhood. Although the signs as well as the symptoms of sickle cell disease are mainly caused by the red blood
cells sickling
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