The random stream type generates a random sequence of bytes of the size that you choose with the optional seed you specify. The actual random data follows the details explained in the Generating Random Data section.
Using the random streaming property is as simple as referencing the property like so:
${dtf.stream(random,1024,1234)}
The previous property defines a random stream of data that has 1024 bytes in length and has a random seed of 1234. This pseudo random data is generated following some rules as explained earlier in this document and can always be re-generated using the same seed. This means you only have to store the size & seed to be able to do data validation later on and not have to save the data itself.