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In order to achieve randomness, key management systems use ___ to choose keys.
Current OS time
CPU serial numbers
Random number generators (RNG)
Private-key cryptography (PKI)
RNG. Modern key-management systems use random number generators (RNG) in order to get real random data. Usually, random data is calculated using the exact timing of keystrokes and the movements of the mouse or using a dedicated device called 'hardware random number generators' when higher level of encryption is required. 2 - The CPU serial numbers (if any) are constant values, not variable, therefore they are not suitable for calculating randomness. 3 - The current OS time does not provide enough random data to be able to calculate enough entropy a.k.a. measure for randomness for today's crypthographic needs. 4 - There is no such thing as 'Private-key cryptography'. The abbreviation PKI stands for Public-Key Infrastructure. See chapter 9, part III in book titled, 'Cryptography Engineering' by Ferguson, Schneier, Kono - Wiley Publishing Inc, 2010.
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