Axborot xavfsizligining kriptografik usullari fanidan yakuniy nazorat ishi 1-bilet

Axborot xavfsizligining kriptografik usullari fanidan yakuniy nazorat ishi
9-bilet
1. GOST 28147-89 - ma’lumotlarni shifrlashning Rossiya standarti algoritmini tushuntiring
2. RSA ochiq kalitli shifrlash algoritmi uchun quyidagi parametrlarga mos yopiq kalitni hisoblang. p=37, q=23, e=431, d=?, hamda shu parametrlar yordamida shifrlangan quyidagi shifrni oching(deshifrlang). C={240,444,639,196,49,49,251,805,650,829,376,321,376,805,650,829,376,321,376,805,650,639,251}, M=?
3. El-Gamal algoritmini tushuntiring va quyidagi parametrlar yordamida shifrni oching (deshifrlang)
P=577, g=201, x=374, a=249, b={287,449,261,98,35,10,148,286,512,261,399,162,24,463}, M=?
Kafedra mudiri Jo'rayev G.U.