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Weak keys in the DES

Briefly state that one should test for the weak keys in the DES?

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As there are 256 possible DES keys, the chance of picking a weak or semi-weak key arbitrary is 2 to 52. As long as the user-provided key is selected wholly at arbitrary, they can be safely avoided whenever DES is employed for encryption. In spite of this, some of the users prefer to test whether a key to be utilized for DES encryption is however a weak key. Such a test will encompass no significant impact on the time needed for the encryption.

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