Abstract:
Steganography plays an important role for
information security in today digital age.
Because of the widespread usages of natural
language, we propose a linguistic
steganography approach based on syntax bank
and HMAC in this paper. The proposed system
first uses the combination of most popular two
lossless data compression methods to compress
the input secret message. At the same time, the
system extracts the syntax of the incoming cover
text sentence. Then, syntax set creation task
constructs the syntax set of the given sentence
with the help of the syntax bank. The syntax
transformation step then transforms the input
sentence into a desired syntax that can
represent the key-controlled semi-randomly
generated secret bits intended to hide in the
sentence. In addition, we apply SHA 512 hash
algorithm to generate keyed-hash message
authentication code (HMAC) in order to present
the identity of the resulting stego text. The
resulting stego text will still be innocent-looking
by applying semantically unchanged syntax
transformation on the input text. Thus, the
detection of the secret message may be hard for
the intruder.
