iSeries Machine Interface Technical Reference from IBM
Midrange.com's MIDRANGE-L archives MD5 via RPG? by Bruce Vining
iSeries NEWS article Tales from the AS/400 CRYPT by Gene Gaunt (requires membership)
iSeries NEWS article Data Integrity With One-Way Hash Functions by Gene Gaunt (requires membership)
iSeries NEWS article Twofish Encryption on the AS/400 by Gene Gaunt (requires membership)