RACF
Resource Access Control Facility
RC2
Rivest's Cipher V2
RC4
Rivest's Cipher V4
RDBMS
relational database management system
RFC
Request for Comments
RMI
Remote Method Invocation
RMI-IIOP
RMI over Internet Inter-Object Request Broker
ROM
read-only memory
RSA
Rivest-Shamir-Adleman