1. DNA SECRET WRITING

3. INTRODUCTION
 Secret writing
 Cryptography
 Steganography
 DNA for data security

4. CRYPTOGRAPHY
 Cryptography is the practice and study of
techniques for secure communication in the
presence of third parties.
 The conversion of information from a readable
state to apparent nonsense.
 The originator of an encrypted message shared
the decoding technique needed to recover the
original information only with intended
recipients, thereby precluding unwanted persons
to do the same.

5. STEGANOGRAPHY
 Steganography is the technique of hiding
confidential information within any
media.
 Eg: image, audio etc.
 Steganography is often confused with
cryptography because the two are similar
in the way that
 they both are used to protect confidential
information.

6. DNA FOR ENCRYPTION
 Deoxyribonucleic acid (DNA) is a long
linear polymer found in the nucleus of a
cell and formed from nucleotides and
shaped likes a double helix, associated
with the transmission of genetic
information.
 DNA can be used in cryptography for
storing and transmitting the information,
as well as for computation

7.  The message is encoded into DNA sequence, and
is sent along with other DNA sequences.
 The principle of DNA steganography is conceal
the information which needs encryption in the
large numbers of irrelevant DNA sequence
chains.
 DNA sequences can be made by using DNA
synthesiser.

8. DNA SECRET WRITING TECHNIQUE

9. ENCRYPTION
Plain text
input
Converted to
ascii
Random DNA
sequence
generated as
OTP
Message
encoded
according to
algorithm
generate a list
of 1500 bases
Find all good
forward and
reverse
primers
Hide the
encrypted
message in
between the
sequence of
primers
Cipher text

10. DECRYPTION
Cipher text
Extract
the
message
sequence
Identify the
index of
message
Decode the
sequence
message