Sapparot-2
As you may have guessed already, Sapparot-2 is a pseudorandom number generator. It is a variant of Sapparot.
Here you can read the detailed paper about this PRNG:
"Sapparot-2. Fast Pseudo-Random Number Generator" (pdf, 115Kb)
Must admit that the name Sapparot-2 is misleading, because in fact Sapparot is a modification of Sapparot-2.
I have designed Sapparot-2 first and then simplified it to Sapparot. This simplified version was released to public before the original one hence the naming confusion.
Sapparot-2 meant to be more secure than Sapparot. However, its security is still not enough to be considered as a cryptographically strong pseudorandom number generator. There are two attacks to illustrate this: one attack by Greg Rose and another one by Francois Grieu.
