Processing circuitry includes key store hardware that stores a plurality of encryption keys. Key stream generator hardware generates a plurality of key streams from the plurality of encryption keys, wherein each key stream comprises a repeating stream of key data. Key river generator hardware generates a key river by parallelizing the plurality of key streams as key river symbols, wherein bits from each key river symbol are selected from each key stream as individual bits from differing ones of the plurality of encryption keys. Binary processor hardware generates a key path as a sequence of binary digits generated from at least one binary function of the key river.