In What Type of Attack Does the Attacker Have the Ciphertext

question 38

Multiple Choice

In what type of attack does the attacker have the ciphertext of several messages that were encrypted with the same encryption algorithm,but has no access to the plaintext so he or she must try to calculate the key used to encrypt the data?

• A) chosen-ciphertext
• B) chosen-plaintext
• C) known plaintext
• D) ciphertext-only

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Definitions:

Sample Size

The number of observations or data points used in a sample for the purposes of statistical analysis.

Mean Deviation

A measure of the average distance between each data point in a set and the mean of the data set, reflecting the dispersion or spread.

Deviations

Differences between observed values and some reference value, often the mean of the set.

Conservative Estimates

Estimates made cautiously to ensure that the actual value is not likely to exceed the estimated value.