Axborot xavfsizligining kriptografik usullari fanidan yakuniy nazorat ishi 1-bilet

Axborot xavfsizligining kriptografik usullari fanidan yakuniy nazorat ishi
7-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=185, d=?, hamda shu parametrlar yordamida shifrlangan quyidagi shifrni oching(deshifrlang). C={461,563,206,461,808,39,238,563,702,808,506,694,461,563,506,702,808,595,238,808}, M=?
3. El-Gamal algoritmini tushuntiring va quyidagi parametrlar yordamida shifrni oching (deshifrlang)
P=449, g=377, x=246, a=161, b={146,367,274,160,260,260,167,360,267,246,153,25,153,360,267,246,153,25,153,360,267}, M=?
Kafedra mudiri Jo'rayev G.U.