문제 풀이 요약
- 주어진 문자열을 bin to string
- caesar cipher
문제 풀이
0100111001010110010000110101010001000110010001000101 0110001000000100101101000110001000000100101001001100 0100010101011010010001010101001001001011010100100100 1010001000000101001001000101010101010010000001001011 0100011001010101010100100101000000100000010110100100 1010001000000101001000100000010110000100011001000110 0101010100100000010101010101001001010000001000000101 0010010001010101010100100000010100100100110001001011 0101100101000010010101100101000000100000010110100100 1010001000000100011101000011010100100101101001010101 0101010001001011010101110101101001001010010011010101 0110010010010101000001011001010100100100100101010101
이곳에서 bin to str 한다.
그러면 NVCTFDV KF JLEZERKRJ REU KFURP ZJ R XFFU URP REU RLKYBVP ZJ GCRZUTKWZJMVIPYRIU 이런 문자열이 나오는데, caesar cipher key=9로 하면 key를 구할 수 있다.
WELCOME TO SUNINATAS AND TODAY IS A GOOD DAY AND AUTHKEY IS PLAIDCTFISVERYHARD
FLAG: PLAIDCTFISVERYHARD
2022년 1월 25일 작성한 글입니다.
