Table 4: Comparison of Encoding Time on Image Message
Insertion.
The time is not much different from the insertion
of text, only a little longer (because the modifications
made must randomize the pixels before inserting the
message). Meanwhile, LSB modification with bit
inverse does not need to randomize the embedded
pixels so that it takes less time.
4.3 Result Analysis
Based on the research that has been carried out, the
modification made by the author with the insertion
based on the length of the message provides better
stegoimage quality to LSB modification with the
inverse bit. This is evidenced by the average Peak
Signal to Noise Ratio (PSNR) as a variable which
states the similarity between the original image and
the higher stegoimage, both at the time of text
message insertion (66.29 dB> 61.8 dB) or image
insertion (54.20 dB> 50.01 dB). In the use of
steganography techniques, comparison of image
quality before and after message insertion is very
important. If a stegoimage file has a large enough file
size and the image quality is too bad, other people
who know about the use of steganography techniques
will be suspicious of the image.
The LSB modification by insertion based on
message length has the advantage of stegoimage
quality. This is because the used of Linear
Congruential Generator (LCG) Algorithm in
randomizing the pixels to be inserted into the
message. From those results, it can be concluded that
the developed modifications were very satisfactory as
seen from the higher quality of the stegoimage. While
deficiencies were found only during processing,
however, they are still within reasonable limits.
5 CONCLUSION
The use of the LCG algorithm in LSB modification
with message length insertion has a very significant
impact (as evidenced by the higher PSNR value than
LSB modification with the inverse bit insertion) both
at text message insertion (66.29 dB> 61.8 dB) and
image insertion (54.20 dB) > 50.01 dB). For further
research, the authors plan to compress the stegoimage
to facilitate the sending of images containing secret
messages. Experiments carried out on the condition
that the decoded stegoimage must not delete
messages with exactly the same order as the original
message. Furthermore, a given stegoimage tolerance
to noise will be tested.
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