Axborot xavfsizligining kriptografik usullari fanidan yakuniy nazorat ishi 1-bilet

Axborot xavfsizligining kriptografik usullari fanidan yakuniy nazorat ishi
18-bilet
1. Feystel tarmog‘ini tushuntiring (i-round uchun)
2. RSA ochiq kalitli shifrlash algoritmi uchun quyidagi parametrlarga mos yopiq kalitni hisoblang. p=37, q=23, e=145, d=?, hamda shu parametrlar yordamida shifrlangan quyidagi shifrni oching(deshifrlang). C={516,444,248,656,256,31,554,31,308,496,756,316}, M=?
3. El-Gamal algoritmini tushuntiring va quyidagi parametrlar yordamida shifrni oching (deshifrlang)
P=829, g=490, x=746, a=559, b={454,514,343,625,232,608,702,796,78,343,437,360,343,61,531,608,625,1}, M=?
Kafedra mudiri Jo'rayev G.U.