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Data Encryption Standard (DES). DES has weak keys. What is the difference between a weak key, a semi-weak key and a possible weak key? What

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Data Encryption Standard (DES). DES has weak keys. What is the difference between a weak key, a semi-weak key and a possible weak key? What is double DES? What kind of attack on double DES makes it useless? What is triple DES? How many keys are use in triple DES process

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