The encryption algorithms discussed in Chapter 2 require a source of random data to generate new symmetric keys. Most computers do not have a hardware-based random number generator, so software developers need to use a software-based implementation to generate random numbers that are suitable.
Because random numbers are generated in software, they are rarely completely random; they are typically pseudorandom ; that is, they appear random, but are not random. To create random data, you need a source of entropy or random input.
Modern cryptographic ...
