How many bits does the Data Encryption Standard (DES) use for data encryption?
- 40 bits
- 56 bits
- 64 bits
- 72 bits
Explanation: DES uses a fixed length key. The key is 64-bits long, but only 56 bits are used for encryption. The remaining 8 bits are used for parity. A DES encryption key is always 56 bits long. When DES is used with a weaker encryption of a 40-bit key, the encryption key is 40 secret bits and 16 known bits, which make the key length 56 bits.
Exam with this question: CCNA Security Chapter 7 Exam Answers
Exam with this question: CCNA Security Chapter 7 Exam (CCNAS v1.2)
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