2-amaliy ish Mavzu: Bir qiymatli o’rniga qo’yishga asoslangan shifrlar tahlili Ishdan maqsad

TOPSHIRIQ YECHIMI:

Shifrlanadigan so`z: RAXMONOV a=3 b=4 m=26 fo’rmula y=E(x)=(3x+4)mod26

SO`Z	R	A	X	M	O	N	O	V
	17	0	23	12	14	13	14	21

Xabar	R	A	X	M	O	N	O	V
X	17	0	23	12	14	13	14	21
3x+4	55	4	73	40	46	43	46	67
(3x+4)mod26	3	4	21	14	20	17	20	15
Shifr matn	D	E	V	O	U	R	U	P

Deshifrlash D(y)=1/a(y-b)modm b=4 a=3

Shifr matn	D	E	V	O	U	R	U	P
Y	3	4	21	14	20	17	20	15
9(y-4)	-9	0	153	90	144	117	144	99
9(y-4)mod26	17	0	23	12	14	13	14	21
SO`Z	R	A	X	M	O	N	O	V