—Nihilist cipher is a manually operated symmetric encryption cipher originally used by Russian Nihilists in the 1880's to organize terrorism against the tsarist regime. The term is sometimes extended to several improved algorithms used much later for communication by the First Chief Directorate with its spies.
[ALGORITHM]
This code requires a KEYWORD and the Polybius square. And, simple mathematics.
[Paano mag encrypt?]
EXAMPLE
Yung plaintext natin ay THE ISLE OF THE SUN. Then, ang ibibigay na keyword/s ay WORLD LITERATURE
•First, Write out mo yung keyword sa ibaba ng message or sa gilid nito (basta kailangan magkalevel ang Plaintext at keyword)
So, magiging ganito na;
T H E I S L E O F T H E S U N
W O R L D L I T E R A T U R E
•By using the Polybius Square 5x5, hanapin mo yung equivalent ng bawat letters.
1 2 3 4 5
1 A B C D E
2 F G H I/J K
3 L M N O P
4 Q R S T U
5 V W X Y Z
Plaintext Keywords
T=44 W=52
H=23 O=34
E=15 R=42
I=24 L=31
S=43 D=14
L=31 L=31
E=15 l=24
O=34 T=44
F=21 E=15
T=44 R=42
H=23 A=11
E=15 T=44
S=43 U=45
U=45 R=42
N=33 E=15
•Lastly, yung plaintext at keyword I add mo. Like,
•T and W. So, 44+52=96
•H and O. So, 23+34=57
[Gets na?]
•Our final ciphertext would be:
96 57 57 55 57 62 39 78 36 86 34 59 88 87 48
•Ang pagdecrypt nyan ay Vice versa lang.
•Paano mag decrypt?
Code/Ciphertext:
96 57 57 55 57 62 39 78 36 86 34 59 88 87 48
Keyword/s: WORLD LITERATURE
