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$x$:input $k$:key $f_{DNA}(x)$:Function Watson-Crick $f_{DES}(x)$:DES

İnvolutory function $f_{DES}(f_{DES}(x))=x$ $f_{DNA}(f_{DNA}(x))=x$

AB-CD CD-(AB+CD) (AB+CD)-(AB+CD)+CD (AB+CD)+CD-((AB+CD)+CD)+(AB*CD) AB-CD

$$ x_{n}-y_{n} \\ \ \ \ \ \ \ \ \ \ \ \ \ y_{n}-(x_{n}\oplus y_{n})\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ (x_{n}\oplus y_{n}) -(x_{n}\oplus y_{n})\oplus y_{n}=x_{n}\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ x_{n}-x_{n}\oplus (x_{n}\oplus y_{n})=y_{n}\\ $$

11-11 11-00 00-11 11-11

10-01 01-11 11-10 10-01

00-A 01-C 10-G 11-T

Length of EB’ is 16 Therefore, ssDNA key (Kdna) sequence length becomes: EB’ * 5 => 16*5 => 80

Kdna: 80 bytes TAATCCCCGGTTTCACACACAGCGAAGGGGCGTAAGACAATATTAACGAAAGACTGCCTATCCCACACGAGTCGTATAAA

EB':0100100101010011 EB'':0101001100011010

1100001101

10110110 GTCGTTCCCAACGAATATTAAGCGACACACCCCGG

BlowFish https://github.com/AdityaMalani/Blowfish-algorithm-python/blob/master/blowfish.py

DES https://github.com/RobinDavid/pydes/blob/master/pydes.py

Feistel_cipher

https://en.wikipedia.org/wiki/Feistel_cipher

1000 iteration

DES KeySize:64bit TextSize:8192bit RAM:>3.5MB Time: 0.12661891078948975 sn

DES+WATSON Time:0.3475011245270917 sn

BlowFish KeySize:448bit TextSize:8192bit RAM:>3.0MB Time:0.045853614807128906 sn

BlowFish+WATSON Time:2.1446536101546942 sn