Axborot xavfsizligining kriptografik usullari fanidan yakuniy nazorat ishi 1-bilet

Axborot xavfsizligining kriptografik usullari fanidan yakuniy nazorat ishi
39-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=635, d=?, hamda shu parametrlar yordamida shifrlangan quyidagi shifrni oching(deshifrlang). C={424,214,206,214,248,37,591,227,37,127,602,117,673,446,674}, M=?
3. El-Gamal algoritmini tushuntiring va quyidagi parametrlar yordamida shifrni oching (deshifrlang)
P=359, g=29, x=318, a=75, b={304,19,289,124,169,139,184,139,20,274,79,289,319,274,289,184,19,274,214,139}, M=?
Kafedra mudiri Jo'rayev G.U.