CTF :: example problems

1. decrypt ciphertext
    - l33t
    - page source

2. admin login

3. HTTP GET

4. vim jail & system cracking
    - Ctrl + z : escape without exiting vim program
    - password file : /etc/passwd    /etc/shadow
    - using vim more : http://developersnote.blogspot.com/2011/01/vi.html
5. hidden key in BMP file
    - vim command: wc (number of lines, words, characters of a file), du(size of file)
    - hexedit (hex editor) & bmp file format

6. weird icon

7. basic BOF
    - stack frame
    - using perl : ./(execution_file) `perl 'print -e "A"x16 . "\x50"'`

8. advanced BOF
    - shellcode

9. reversing
    - link: http://uiandwe.tistory.com/category/%EB%87%8C%EC%84%B8%ED%8F%AC%EB%8D%A9%EC%96%B4%EB%A6%AC%22%22/%EB%A6%AC%EB%B2%84%EC%8B%B1

reference
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When searching result is bad ... GO TO YOUTUBE !
CTF problems type : http://beist.org/new_ver_board/read.html?table=new_freeboard&uid=199&page=93
Web application attack type : http://blog.daum.net/f85t75/2576448, http://acc.ahnlab.com/secu_view.asp?seq=4743