Question

What is the size of the key in the DES algorithm for security?

• A. 32 bits
• B. 30 bytes
• C. 56 bits
• D. 64 bytes

Hint:

DES key length = 56 bits (actual), though total block size = 64 bits.

Answer 1

The Correct Option is C

Data Encryption Standard (DES) uses a 56-bit key for encryption.
Although the key block is 64 bits, 8 bits are used for parity, leaving an effective key length of 56 bits.