• O‘rniga qo‘yish akslantirishida ochiq matndagi belgilar shifrmatnda bo‘lmasligi
mumkin.
• Biroq, ochiq matndagi belgilarning takrorlanish
chastotasi shifrmatndagi
belgilarda ham bir xil bo‘ladi (ko‘p alifboli o‘rniga qo‘yish
usullari bundan
mustasno).
• Masalan, yuqoridagi misolda ochiq matndagi “L”
harfining takrorlanish
chastotasi 2 ga teng. Uning o‘rniga qo‘yilgan shifrmatndagi “O”
harfining ham
takrorlanish chastotasi 2 ga teng. Bu holat ochiqmatndagi
qolgan belgilar uchun
ham o‘rinli.
O‘rin almashtirish akslantirishi
Ochiq matn belgilarining o‘rni biror qoidaga ko‘ra o‘zaro almashtiriladi.
Bunda
ochiq matnga ishtirok etgan belgilar shifrmatnga ham ishtirok etib, faqat ularning
o‘rni almashgan holda bo‘ladi.
XULOSA
Axborotning himoyalashning aksariyat mexanizmlari asosini shifrlash tashkil etadi. Axborotni
shifrlash deganda, ochiq axborotni (dastlabki matnni) shifrlangan axborotga o’zgartirish
(shifrlash) va aksincha (rasshifrovka qilish) jarayoni tushuniladi.
FOYDALANILGAN ADBIYOTLAR
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