DNA SECRET WRITING

INTRODUCTION

Secret writing

Cryptography

Steganography

DNA for data security

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.

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.

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

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.

DNA SECRET WRITING TECHNIQUE

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

DECRYPTION

Cipher text

Extract

the

message

sequence

Identify the

index of

message

Decode the

sequencemessage