The first lexical substitution method was proposed by Chapman and Davida ( 1997 ) .
hiding the hidden a software system for concealing ciphertext as innocuous text
Mark Chapman George I Davida
The simplest and most straightforward subliminal modification of text is to substitute selected words with their synonyms . The first lexical substitution method was proposed by Chapman and Davida ( 1997 ) . Later works , such as Atallah et al. ( 2001a ) , Bolshakov ( 2004 ) , Taskiran et al. ( 2006 ) and Topkara et al. ( 2006b ) , further made use of part-ofspeech taggers and electronic dictionaries , such as WordNet and VerbNet , to increase the robustness of the method .
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