Question: suppose a cipher uses an 8-character mixed-case alphanumeric key (0-9, a-z, and A-Z). 1 What is the approximate strength of the key, measured in bits?

suppose a cipher uses an 8-character mixed-case alphanumeric key (0-9, a-z, and A-Z).

1 What is the approximate strength of the key, measured in bits? Hint: rewrite the size of the keyspace as a power of two.

2 If a particular computer can test 240 keys per second, how long will it take (on average) to guess the key of this cipher?

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