How many encryption key bits are needed to double the number of possible key values that are available with a 40-bit encryption key?

Last Updated on November 21, 2023 by InfraExam

How many encryption key bits are needed to double the number of possible key values that are available with a 40-bit encryption key?

• 41 bits
• 80 bits
• 120 bits
• 160 bits
  

  Explanation & Hint: To double the number of possible key values available with a 40-bit encryption key, you would only need to add one more bit: 41 bits Each additional bit doubles the number of possible keys because each bit has two possible values (0 or 1). Therefore, going from a 40-bit key to a 41-bit key doubles the number of possible keys from 240240 to 241241.

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