Axborot xavfsizligining kriptografik usullari fanidan yakuniy nazorat ishi 1-bilet

Axborot xavfsizligining kriptografik usullari fanidan yakuniy nazorat ishi
50-bilet
1. DES-malumotlarni shifrlash standartini tushuntiring
2. RSA ochiq kalitli shifrlash algoritmi uchun quyidagi parametrlarga mos yopiq kalitni hisoblang. p=37, q=23, e=281, d=?, hamda shu parametrlar yordamida shifrlangan quyidagi shifrni oching(deshifrlang). C={553,620,452,233,608,553,481,620,512,840,452,786,452,620,813,512}, M=?
3. El-Gamal algoritmini tushuntiring va quyidagi parametrlar yordamida shifrni oching (deshifrlang)
P=389, g=63, x=162, a=321, b={363,220,15,281,363,301,363,55,363,199,240,302,383,363,261,363,240,302,158}, M=?
Kafedra mudiri Jo'rayev G.U.