Q40. Symmetric - key cryptography refers to ______methods in which both the sender and receiver share the same key ( or , less commonly, in which their keys are different but related in an easily computable way):

Вариант ответа 1 - a) Encryption

Вариант ответа 2 - b) Decryption

Вариант ответа 3 - c) Both of above

Вариант ответа 4 - d) None of These

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