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In the DES algorithm the 64 bit key input is shortened to 56 bits by ignoring every 4th bit.

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In the DES algorithm the 64 bit key input is shortened to 56 bits by ignoring every 4th bit.

(a) True

(b) False

I had been asked this question during an interview for a job.

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

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Best answer
The correct option is (b) False

Best explanation: Every 8th bit is ignored to shorten the key length.

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