예전에 핸드폰 비밀번호 를 맞추는 방법이라고 해서 만가지 정도의 숫자

0000~9999 까지 올라온게 있었다. 그분도 욕봤으리라.

오늘. 우연히 웹의 비밀번호 ( 제로보드 의 비밀번호 ) 관련하여 호기심이 들었다.

비밀번호를 알수있지 않을까???

제로보드의 비밀번호는 md5() 라는 함수를 이용하여 저장한다.

ex) 1111 -> md5(‘1111‘) -> b59c67bf196a4758191e42f76670ceba

제로보드 홈페이지는 최소 6자리 이상 길이의 비밀번호를 받기에.

그래서 도전해 보았다.

영어 숫자 특수키 조합으로

첫번째에 영문 대/소 문자 와 숫자 그리고 특수문자 .

우선 시간이 얼마나 걸리나 알아보기위해 1자리일때와 2자리일때 3자리일때를 차례로 해보았다.

1자리
2009082820090828144139-a=0cc175b9c0f1b6a831c399e269772661
2009082820090828144139-b=92eb5ffee6ae2fec3ad71c777531578f
2009082820090828144139-c=4a8a08f09d37b73795649038408b5f33
.
2009082820090828144139-)=9371d7a2e3ae86a00aab4771e39d255d
2009082820090828144139-_=b14a7b8059d9c055954c92674ce60032
2009082820090828144139-+=26b17225b626fb9238849fd60eabdf60
2009082820090828144139-|=b99834bc19bbad24580b3adfa04fb947

1초이내에 끝났다.


훗 하면서 2자리를 해보았다.

2009082820090828144139-aa=4124bc0a9335c27f086f24ba207a4912
2009082820090828144139-ab=187ef4436122d1cc2f40dc2b92f0eba0
2009082820090828144139-ac=e2075474294983e013ee4dd2201c7a73
.
.
2009082820090828144140-|_=58f708d1554efea23f2cd57fa70d15f5
2009082820090828144140-|+=5b6f9e84f04d6c6486b365d3e4aba0ed
2009082820090828144140-||=7d010443693eec253a121e2aa2ba177c

이것도 2초 이내에 끝이났다.( 앞의 20090828 이 날짜이고 144140이 시분초 이다 )

참고로 내가 정한 글자 는 총 76 글자 이다.( 소문자26 대문자26 숫자10 특수문자14 )

계산을 해보았다.

76                                      =76
76*76                                   =5776
76*76*76                                =438976
76*76*76*76                             =33362176   <- 4자리
76*76*76*76*76                          =2535525376
76*76*76*76*76*76                       =192699928576
76*76*76*76*76*76*76                    =14645194571776
76*76*76*76*76*76*76*76                 =1113034787454976
76*76*76*76*76*76*76*76*76              =84590643846578176
76*76*76*76*76*76*76*76*76*76           =6428888932339941376
76*76*76*76*76*76*76*76*76*76*76        =488595558857835544576
76*76*76*76*76*76*76*76*76*76*76