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A cipher machine is a mechanical device for encoding and decoding messages.
The Greeks
unconditional security no matter how much computer power or time is available, the cipher cannot be broken since the ciphertext provides insufficient information to uniquely determine the corresponding plaintext computational security given limited computing resources (eg time needed for calculations is greater than age of universe), the cipher cannot be broken
code.
Using a keyword as long as the message will make a vigenere cipher unbreakable.