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Description
In a stream cipher structure a key is input to a pseudorandom bit generator that produces a stream of 8-bit numbers that are apparently random. The output of the generator, called a , is combined one byte at a time with the plaintext stream using the bitwise exclusive-OR operation.
- The code above generates the following result. To generate a stream in which the next element is generated based on the previous one, you will need to use a Supplier that stores the last generated element.
- For a block cipher with a n-bit key, if, given a plaintext block and the corresponding ciphertext, the key can be guessed in less than 2 n-1 step on average, then that block cipher will be said to be 'broken' and cryptographers will make a point of not using it. The AES is not broken (yet). A few things may still be said, though: Having a plaintext and the corresponding ciphertext.
Pseudorandom numbers in MATLAB® come from one or more randomnumber streams. The simplest way to generate arrays of random numbersis to use rand, randn, or randi.These functions all rely on the same stream of uniform random numbers,known as the global stream. You can createother streams that act separately from the global stream, and youcan use their rand, randi, or randn methodsto generate arrays of random numbers. You can also create a randomnumber stream and make it the global stream.
To create a single random number stream, use the RandStream constructor.To create multiple independent random number streams, use RandStream.create.The rng function provides asimple interface to create a new global stream.
stream = RandStream.getGlobalStream returnsthe global random number stream, that is, the one currently used bythe rand, randi, and randn functions.
prevstream = RandStream.setGlobalStream(stream) designatesthe random number stream stream as the new globalstream to be used by the rand, randi, and randn functions,and returns the previous global stream.
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A random number stream s has propertiesthat control its behavior. Access or assign to a property using p= s.Property or s.Property = p. The followingtable lists defined properties: