Caesar

Platform: spbctf | Category: Crypto | Type: Challenge | Difficulty: Easy | OS: NA | Author: XESXOR | Date: 2026-03-08 | Status: Solved Techniques: 33-letter alphabet with ё, Russian alphabet Caesar cipher brute-force

Summary

Task: decrypt a garbled Russian text encrypted with a Caesar cipher. Solution: brute-force all 33 shifts of the Russian alphabet (including ё), shift 21 produces readable text with the numeric flag.

Caesar — cryptokids20

Description

Russian Caesar cipher with shift 21 on 33-letter alphabet (with ё).

Solution

Brute-force all 33 shifts. Shift 21: 'Поздравлос! Флаг: девять восемь три один три три семь один два три!' ‍​‌‌​​‌​​​‌‌​​‌​​​​‌‌​‌​​​​‌‌‌​​‌​​‌‌​​​‌​​‌‌‌​​​​​‌‌​‌‌​​​‌‌​​​​‍