How to increase the length of the transmitted message using a pseudo-random number generator?

Question

Algorithms

Hello everyone, on Habré I found an article "Details about random and pseudo-random number generators". I decided to try to encrypt in this way:
1. Encode words through a dictionary.
2. change the seed in the PSC generator to a numerical sequence
3. generate 2 numbers.
Transmit 2 numbers over the channel, then make a turn and pull out our primary seed.
But since there, as much as possible, it’s a long decision to try to write in php with either gmp, but I’m familiar with java at a very primitive level, so I’m interested in the number generation algorithm, with all the constants :)