19번 문제에요.
배점은 154점, 분야는 포렌식이에요.
Cipher II : What is it?
0100111001010110010000110101010001000110010001000101
0110001000000100101101000110001000000100101001001100
0100010101011010010001010101001001001011010100100100
1010001000000101001001000101010101010010000001001011
0100011001010101010100100101000000100000010110100100
1010001000000101001000100000010110000100011001000110
0101010100100000010101010101001001010000001000000101
0010010001010101010100100000010100100100110001001011
0101100101000010010101100101000000100000010110100100
1010001000000100011101000011010100100101101001010101
0101010001001011010101110101101001001010010011010101
0110010010010101000001011001010100100100100101010101
이번엔 2진수네요.
줄을 다 붙이고 16진수로 바꾸고
ASCII 로 바꾸면 이상한 문자열이 나오네요.
뭔가 카이사르 암호같은데 복호화 사이트를 이용할게요.
Caesar Cipher - Shift Cipher - Decoder, Encoder, Solver, Translator
Tool to decrypt/encrypt with Caesar. Caesar cipher (or Caesar code) is a shift cipher, one of the most easy and most famous encryption systems. It uses the substitution of a letter by another one further in the alphabet.
www.dcode.fr
에 저걸 집어넣고 돌려보면?
WELCOME TO SUNINATAS AND TODAY IS A GOOD DAY AND AUTHKEY IS PLAIDCTFISVERYHARD
근데 저대로 Auth 에다가 집어넣으니깐 안되길래 소문자로 변환하면?
welcome to suninatas and today is a good day and authkey is plaidctfisveryhard
빠밤!
키가 나왔네요.
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