OMFLIP - Fast Permutation Instruction for Processor based on Omega and Flip Networks

Web Published:

Princeton Docket #00-1710-1


The present invention provides permutation instructions which can be used in software executed in a programmable processor for solving permutation problems in cryptography, multimedia and other applications. The permute instructions are based on an omega-flip network comprising at least two stages in which each stage can perform the function of either an omega network stage or a flip network stage. Intermediate sequences of bits are defined that an initial sequence of bits from a source register are transformed into. Each intermediate sequence of bits is used as input to a subsequent permutation instruction. Permutation instructions are determined for permuting the initial source sequence of bits into one or more intermediate sequence of bits until a desired sequence is obtained. The intermediate sequences of bits are determined by configuration bits. The permutation instructions form a permutation instruction sequence, of at least one instruction. At most 21 gr/m permutation instructions are used in the permutation instruction sequence, where r is the number of k-bit subwords to be permuted, and m is the number of network stages executed in one instruction. The permutation instructions can be used to permute k-bit subwords packed into an n-bit word, where k can be 1, 2, . . . , or n bits, and k*r=n.



Faculty Inventor


Ruby B. Lee is the Forrest G. Hamrick Professor in Engineering and Professor of Electrical Engineering at Princeton University, with an affiliated appointment in the Computer Science Department. She is the director of the Princeton Architecture Laboratory for Multimedia and Security (PALMS). Professor Lee is an expert in hardware-enhanced security and has designed architectures for secure processors, secure caches that do not leak information through side-channel attacks, and secure servers for cloud computing. Her research is in the intersection of computer architecture and cyber security. She is a Fellow of the Association for Computing Machinery (ACM) and a Fellow of the Institute of Electrical and Electronic Engineers (IEEE). She holds over 120 U.S. and international patents.


Intellectual Property Status


Patent granted:


US 6952478 B2



Princeton is seeking to identify appropriate partners for the further development and commercialization of this technology.




Michael Tyerech
Princeton University Office of Technology Licensing

(609) 258-6762•

Laurie Bagley
Princeton University Office of Technology Licensing

(609) 258-5579•


Patent Information:
For Information, Contact:
John Ritter
Princeton University
Ruby Lee
Xiao Yang
data security