육군 정보보호병

Posted by nopsled
2016.04.23 16:59 일상생활



드디어 군대에 갈 수 있게 되었다..

5.23에 입영이고 누구나 그렇듯 논산으로 가게된다.

육군 정보보호병에 고졸로써 붙은 것도 너무 다행이라고 생각한다. 물론 운이 많이 따라준것 같다.

입영통지서가 5.31정도에 날아올뻔 했지만 붙어서 정말 다행이다. 원하는 군대로가서 열심히 하고 전역하자ㅜㅜ

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[세종 CTF/250] Private Torrent

Posted by nopsled
2016.04.07 15:13 문제풀이



처음 바이너리 받고 확인하면 PK 포맷으로 ZIP파일인걸 알게 됩니다.





토렌트파일인거 확인.






다운 받으려 했지만 불가능.. 트래커 서버가 onion이다...


Tor 브라우저와 토렌트 연결해주어야 사용 가능..인포해쉬나 peer_id 같은거 알면 그냥 밑에 그대로 진행하심 됩니더



::1 - - [02/Apr/2016:16:33:12 +0900] "GET http://ovmqomeprulxo35z.onion/announce.php?info_hash=1%03%86%f8e%f9%159%20%d9%cfn%d3DT%21%efA%88%3b&peer_id=-UM1870-C%a3G%c3V%60bY%8c%dc%0e%e4&port=24874&uploaded=0&downloaded=0&left=73&corrupt=0&key=7305D41C&event=started&numwant=200&compact=1&no_peer_id=1&ipv6=fe80%3a%3a82e6%3a50ff%3afe0f%3a8bac HTTP/1.1" 404 210 "-" "uTorrentMac/1870(41795)"


- 아파치 로그 확인하면 저런 로그가 찍혀 있는데 저거 그대로 복사해서 들어가면 된다. 저기로 들어가주자.




bencode 형식으로 인코딩된 키인데 디코딩 해주면 된다. 해줄 필요도 없긴한데 그냥 해준다.


디코딩하면 json방식 이므로~


>>> print bencode.bdecode('d16:R4sc4l123_is_g0d3:keye')

{'R4sc4l123_is_g0d': 'key'}


사실 R4sc4l123_is_g0d3이거 열심히 입력했는데 R4sc4l123_is_g0d였다..



Thanks to @이상섭

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[세종 CTF/250] Simple_Calculation

Posted by nopsled
2016.04.07 15:13 문제풀이

Just calculate 60 times! nc 203.250.148.100 31062



60번의 시도로 계산하랍니다. 그냥 간단한 코딩 MISC문제..


코드는 더러워도 이해해주세요.ㅋㅋ




calc.py



import socket, time

def calc(answer):

    operator = ['+','-','*','/','&','|','^']

    test = []

    for i in range(0, len(answer)):

        if not answer[i] in operator:

            test.append(answer[i])

        else:

            if answer[i] == '+':

                test.append(answer[i].replace('+','-'))

            elif answer[i] == '-':

                test.append(answer[i].replace('-', '+'))

            elif answer[i] == '*':

                test.append(answer[i].replace('*', '/'))

            elif answer[i] == '/':

                test.append(answer[i].replace('/', '*'))

            elif answer[i] == '&':

                test.append(answer[i].replace('&', '^'))

            elif answer[i] == '|':

                test.append(answer[i].replace('|', '&'))

            elif answer[i] == '^':

                test.append(answer[i].replace('^','|'))

    return ''.join(test)


s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

s.connect(('203.250.148.100' , 31062))


print s.recv(1024) # Lovely Calculation!

s.send('d') # Enter Game


print s.recv(1024) # Two Game

s.send('Myeong\n') # Enter Game


print s.recv(1024)


s.send('\n') # press any key


for i in range(0, 60):

    response = s.recv(1024)

    print response,

    answer = response.split('\r\n')[0].split(' : ')[1]

    answer = calc(answer)

    print str(eval(answer)) + '\t\t' + answer

    s.send(str(eval(answer))+'\r\n')

    time.sleep(1)

print s.recv(1024)

print s.recv(1024)



nopsled@smleeo3o:~/Desktop (=ω´=)$ python test.py

Lovely Calculation!


This problem includes 60 rounds.


Specific Info.

1.Each round has 3 sec. time limit. And all of the answers will be INTEGER ONLY!

2.From round 1 to round 20, there will be less than 5 numbers that you should calculate. The operators will be +,-,*,%.

3.From round 21 to round 40, there will be more than 5 numbers that you should calculate. Also, the equation can have parenthesis. The operators will basically same as round 1 to 20.

4.From round 41 to round 60, there will be more than 10 numbers that you should calculate. Also, the equation can have parenthesis and &,|,^ operator. It follows the standard C language's operator precedence.

5.The operators are little bit different. + -> -, - -> +, * -> /, / -> *, & -> ^, | -> &, ^ -> |


What is your name? :

Have Fun!(Press Any Key)


Round 1 : 7+5*7%1

Answer :  7 7-5/7%1

Round 2 : 2/1+4-2

Answer :  0 2*1-4+2

Round 3 : 4+5%3

Answer :  2 4-5%3

Round 4 : 1%6-8+3

Answer :  6 1%6+8-3

Round 5 : 4+6

Answer :  -2 4-6

Round 6 : 2%6

Answer :  2 2%6

Round 7 : 8+7

Answer :  1 8-7

Round 8 : 9+8

Answer :  1 9-8

Round 9 : 7+9

Answer :  -2 7-9

Round 10 : 5-8

Answer :  13 5+8

Round 11 : 4%1+5+7

Answer :  -12 4%1-5-7

Round 12 : 9/1

Answer :  9 9*1

Round 13 : 2/4+1

Answer :  7 2*4-1

Round 14 : 9%1*4%4

Answer :  0 9%1/4%4

Round 15 : 5-4+4%2

Answer :  9 5+4-4%2

Round 16 : 8%5*2+3

Answer :  -2 8%5/2-3

Round 17 : 8-5

Answer :  13 8+5

Round 18 : 2+1

Answer :  1 2-1

Round 19 : 6*3

Answer :  2 6/3

Round 20 : 1+2+8+7

Answer :  -16 1-2-8-7

Round 21 : (4*1-7+5)-1*1*2

Answer :  6 (4/1+7-5)+1/1/2

Round 22 : 1*1+4+9*2

Answer :  -7 1/1-4-9/2

Round 23 : 7-9/5+1/8+1*4-1%3

Answer :  45 7+9*5-1*8-1/4+1%3

Round 24 : 1*7/1+2%4

Answer :  -2 1/7*1-2%4

Round 25 : 1*1*4*2+7*3%1*7

Answer :  0 1/1/4/2-7/3%1/7

Round 26 : 7*7*1-7-3

Answer :  11 7/7/1+7+3

Round 27 : 5+8*7-4/8-4-9+1

Answer :  48 5-8/7+4*8+4+9-1

Round 28 : 1+1/1+1*4

Answer :  0 1-1*1-1/4

Round 29 : 8*3%1+8+3-9+1+7

Answer :  -10 8/3%1-8-3+9-1-7

Round 30 : 6-1/1/1+4

Answer :  3 6+1*1*1-4

Round 31 : 3+4+5-4*1%7+2+7

Answer :  -11 3-4-5+4/1%7-2-7

Round 32 : 3+4/1+8-3/7/4/2*8

Answer :  12 3-4*1-8+3*7*4*2/8

Round 33 : 7*4*6*7+1+9

Answer :  -10 7/4/6/7-1-9

Round 34 : 1+7%1%8%6+9+1

Answer :  -9 1-7%1%8%6-9-1

Round 35 : 4-6+5%4-7*1

Answer :  16 4+6-5%4+7/1

Round 36 : 1-7%1/9-4*8/1

Answer :  1 1+7%1*9+4/8*1

Round 37 : 3%1+5%1+6*1+7*1+5

Answer :  -18 3%1-5%1-6/1-7/1-5

Round 38 : 3-8/4+3+9

Answer :  23 3+8*4-3-9

Round 39 : 1/9-6+7/1-1+2-2/8

Answer :  23 1*9+6-7*1+1-2+2*8

Round 40 : 6+3%8+1-6

Answer :  8 6-3%8-1+6

Round 41 : 8+7|(7-1)+4|7^5*4

Answer :  1 8-7&(7+1)-4&7|5/4

Round 42 : 3|8%2-7%4

Answer :  3 3&8%2+7%4

Round 43 : 1^3+7-4%6+3+7+3

Answer :  -13 1|3-7+4%6-3-7-3

Round 44 : 1%9+1-5+3

Answer :  2 1%9-1+5-3

Round 45 : 7+5+4-5|9/1+9^4

Answer :  4 7-5-4+5&9*1-9|4

Round 46 : 3+8+1+7|6+1%1%2%8

Answer :  2 3-8-1-7&6-1%1%2%8

Round 47 : 1&4+3%2*1+1

Answer :  3 1^4-3%2/1-1

Round 48 : 1+6+1^6^8&1%1+1+9

Answer :  -2 1-6-1|6|8^1%1-1-9

Round 49 : 3/5+9*1+4/3

Answer :  -6 3*5-9/1-4*3

Round 50 : 4%1+7^7+8^4%4

Answer :  -1 4%1-7|7-8|4%4

Round 51 : 5-9%1+7-6+9

Answer :  -5 5+9%1-7+6-9

Round 52 : 3+1+2*8^4*9*4%1%7

Answer :  2 3-1-2/8|4/9/4%1%7

Round 53 : 4*7|1|3%3+5-4+4*1

Answer :  0 4/7&1&3%3-5+4-4/1

Round 54 : 1+7*7|6+9

Answer :  0 1-7/7&6-9

Round 55 : 3%1^4/7/2+1%1%1

Answer :  56 3%1|4*7*2-1%1%1

Round 56 : 8+5^6/8/4

Answer :  195 8-5|6*8*4

Round 57 : 4^1*2|8%9*1+3+9

Answer :  4 4|1/2&8%9/1-3-9

Round 58 : 1+4*1|7^1

Answer :  5 1-4/1&7|1

Round 59 : 7+1^3%1%6^2^3%5

Answer :  7 7-1|3%1%6|2|3%5

Round 60 : 2-9^4+1*1

Answer :  11 2+9|4-1/1

Congrats! You've cleared whole probs!

The key is on https://www.youtube.com/watch?v=NQlnVVQbpi0 




네 넘나 이쁘고 귀여워서 문제 만든분께 감사합니다.


Thanks to @sup3rv1s0r

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