Liu et al. ( 2005 ) , Meral et al. ( 2007 ) , Murphy ( 2001 ) , Murphy and Vogel ( 2007 ) and Topkara et al. ( 2006a ) all belong to the syntactic transformation category .
the syntax of concealment reliable methods for plain text information hiding
Brian Murphy Carl Vogel
In other words , instead of performing lexical substitution directly to the text , the secret message is embedded into syntactic parse trees of the sentences . Liu et al. ( 2005 ) , Meral et al. ( 2007 ) , Murphy ( 2001 ) , Murphy and Vogel ( 2007 ) and Topkara et al. ( 2006a ) all belong to the syntactic transformation category . After embedding the secret message , modified deep structure forms are converted into the surface structure format via language generation tools .
Liu et al. ( 2005 ) , Meral et al. ( 2007 ) , Murphy ( 2001 ) , @@CITATION and Topkara et al. ( 2006a ) all belong to the syntactic transformation category .