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

TOPSHIRIQ YECHIMI:

Xabar: ASQAROV a=3 b=4 m=26 fo’rmula y=E(x)=(3x+4)mod26

Xabar	X	U	S	I	N	O	V
	23	20	18	8	13	14	21

Xabar	X	U	S	I	N	O	V
X	23	20	18	8	13	14	21
3x+4	73	64	58	28	43	46	67
(3x+4)mod26	21	12	6	2	17	20	15
Shifr matn	V	M	G	C	R	U	P

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

Shifr matn	V	M	G	C	R	U	P
Y	21	12	6	2	17	20	15
9(y-4)	153	72	18	-18	117	144	99
9(y-4)mod26	23	20	18	8	13	14	21
Xabar	X	U	S	I	N	O	V