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Command Line Arguments

• The sample program (caesar.cpp) is used to encrypt a file - that is, scrambles it so that it is unreadable except to those who know the decryption method and the secret keyword.
• This program uses a method familiar to Julius Caesar.
  • The person performing any encryption chooses an encryption key (a number between 1 and 25).
  • The key indicates the shift to be used in encrypting each letter. (For example, if the key is 3, we replace A with D, B with E, etc.).

    Plain Text

    M

    e

    e

    t

    m

    e

    a

    t

    . . .

    Encrypted Text

    P

    h

    h

    w

    p

    h

    d

    w

    . . .

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