Axborot xavfsizligining kriptografik usullari fanidan yakuniy nazorat ishi 1-bilet

Axborot xavfsizligining kriptografik usullari fanidan yakuniy nazorat ishi
30-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=389, d=?, hamda shu parametrlar yordamida shifrlangan quyidagi shifrni oching(deshifrlang). C={788,12,296,9,100,154,553,391,179,296,73,179,620,9,341,73,179,391,358,179,125,341,742}, M=?
3. El-Gamal algoritmini tushuntiring va quyidagi parametrlar yordamida shifrni oching (deshifrlang)
P=409, g=328, x=393, a=180, b={80,63,135,311,44,205,347,400,277,63,205,135,188,99,10,347,63,383}, M=?
Kafedra mudiri Jo'rayev G.U.