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In triple DES, the key size is ___ and meet in the middle attack takes ___ tests to break the key.

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In triple DES, the key size is ___ and meet in the middle attack takes ___ tests to break the key.

(a) 2192 ,2112

(b) 2184,2111

(c) 2168,2111

(d) 2168,2112

This question was addressed to me in an online interview.

My question is taken from The Data Encryption Standard (DES) and It’s Strength in portion Block Ciphers and the Data Encryption Standard of Cryptograph & Network Security

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Correct answer is (d) 2168,2112

To explain: The key size is 2168 and meet in the middle attack takes 2112 tests to break.

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