A framework for synthetic stego. - Philip C. Ritchey; Jorge R. Ramos; Vernon Rego (CSIIRW, 2009)

Hiding Secret Messages in Huffman Trees. - Philip C. Ritchey; Vernon Rego (IIH-MSP, 2012)

Covert channels in combinatorial games. - Philip C. Ritchey; Vernon Rego (SimuTools, 2012)

A Context Sensitive Tiling System for Information Hiding. - Philip C. Ritchey; Vernon Rego (J. Inf. Hiding Multim. Signal Process., 2012)

It's Not About Winning, it's About Sending a Message: Hiding information in games. - Philip C. Ritchey (XRDS, 2013)

Synthetic steganography: Methods for generating and detecting covert channels in generated media - Philip C. Ritchey (2015)