Cryptographically strong random numbers in MaraDNS 2.0. The hash nature of RadioGatún allows me to combine multiple entropy sources with varying amounts of randomness together to seed it then use it as a stream cipher to generate good random numbers. This way, the DNS query ID and source port are hard to guess, making blind DNS spoofing harder.

The nice thing about RadioGatún is that it only takes about 2k of compiled code (and can fit in under 600 bytes of source code, as seen in the parent) to pull all this off.

This was the best way to pull it off back in 2007, when RadioGatún was the only secure Extendable-Output Function (XOF) that existed.