IEEE Consumer Electronics Magazine - September 2018 - 32

added as seventh bit to form a 7-bit ASCII. These are then
converted to their corresponding characters to get the medi-
cal report, fitness report, and so on. For X-rays and other
kinds of image data, 8 bits are taken at a time and converted
to pixel's intensities.

Embedding large amounts of
data without disturbing the
perceptibility is one of the
challenges of steganography.

RESULTS AND STRENGTH ANALYSIS

public key of the medical center using the process of reverse
digital signature [18]. Then the encrypted (2's complement-
ed) text is extracted from the stego audio file by using the
process of reverse embedding. The extraction process also
uses the concept of permutation as well as the arrangement
selection mechanism discussed during the medical center-
side operation. Then the hidden bits are picked from the
selected LSB positions of the samples [17].
The encrypted extracted data are now decrypted using
the reversible nature of 2's complement arithmetic. The
result of 2's complementary operation is then sent to the
postprocessing step. In the postprocessing step, the text and
the image data are segregated according to their length (Fig-
ure 6). The decrypted bits are considered six at a time; if the
MSB of 6 bits is 0, 1 is added as seventh bit; otherwise, 0 is

The proposed medical-report transmission system for visa
processing was tested successfully. The testing database con-
tains more than 500 audio files related to the medical field
(such as the applicant's voice, ads related to the medical
equipment, tests, medicines, or the medical center's own adver-
tisement, the doctor's lectures, and so on). The secret data, i.e.,
the patient's medical report, contain the personal details,
pathological reports, chest X-ray, and fitness certificates issued
by the doctor. The size of the secret data is roughly the same
for all applicants.
The perceptibility of stego audio is analyzed by signal-to-
noise ratio (SNR) [17] helps to measure the efficiency of the
proposed work. The SNR value is within the acceptable range
for n 1 8 but becomes poor for higher values of n.
Embedding large amounts of data without disturbing the
perceptibility is one of the challenges of steganography. Here,

Embassy

Embassy
Database
Store Authorized
Stego Audio

Received By

Authorized
Stego Audio

Authorized
Stego Audio

Decrypt Using
Digital Signature

Embassy
Officials

Extraction Using
Steganography

Visa
Applicant

Encrypted
Medical Report

Send for
Processing

Decryption Technique

Applicant's
Medical Report
FIGURE 6. The visa approval process at an embassy.
32 IEEE Consumer Electronics Magazine

^

september 2018

Stego Audio



Table of Contents for the Digital Edition of IEEE Consumer Electronics Magazine - September 2018

Contents
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