# Brute-Force Cracking Time

Encrypt-It-Rite, a vendor of encryption software, sells a symmetric cipher that uses a 56-bit key. The company decides to conduct a "challenge" to crack an encrypted message using a brute-force approach. The average time to crack the message is found to be 12 hrs. How many more bits would they need to add to the key to increase the average cracking time to 12,288 hrs?

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#### Solution Preview

We are given that key size = 56 bits and T = time = 12 hrs.

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#### Solution Summary

The solution gives detailed steps on finding the number of bits that are needed to add to a symmetric cipher bit key to increase the average cracking time of an encrypted message from its current time of 12 hours when a brute-force approach is used.

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