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   indra
   http://indra.linuxstudy.pe.kr
   [re] ¸®´ª½º»ó DES¾Ë°í¸®Áò(C·Î ±¸¼º)..¾î¶»°Ô ÄÄÆÄÀÏ ÇÏ´ÂÁö...

http://www.hackerschool.org/HS_Boards/zboard.php?id=QNA_programming&no=136 [º¹»ç]


Ç»ÃĽýºÅÛ¿¡¼­ ±¸ÇöÇؼ­ ³»³õÀº ÄÚµå³×¿ä..
Àúµµ SEED ÂÊ ¾Ë°í¸®Áò Á» °øºÎÇÏ´À¶ó.. ¸¹ÀÌ ºÃ´Âµ¥..
ÀÏ´Ü Àú ¾Ë°í¸®ÁòÀº ENDIAN À̶ó´Â °³³äÀÌ Áß¿äÇÑ ºñÁßÀ» Â÷ÁöÇϹǷÎ
ÄÄÆÄÀϽÿ¡ -D ¿É¼ÇÀ¸·Î ÇØ´ç ENDIAN °ªÀ» Á¤ÇØÁÖ¼Å¾ß ÇÕ´Ï´Ù.
little endian °ú big endian, µÎ°¡ÁöÀÇ °æ¿ì°¡ Àִµ¥
intel ÇÁ·Î¼¼¼­¶ó¸é little endian ÀÔ´Ï´Ù.
´ÙÀ½°ú °°ÀÌ ÄÄÆÄÀÏ ÇÏ½Ã¸é µË´Ï´Ù.

[indra@indra des]$ gcc -o des des.c desenc.c test.c -DUSER_LITTLE_ENDIAN
test.c: In function `main':
test.c:463: warning: return type of `main' is not `int'
[indra@indra des]$ ./des
ERROR(CTR_USAGE_ERROR) :::: Invalid Number of Argument

Usage1 : -[T/S]   (Test Value/Test Speed)
Usage2 : -[E/D] -[ECB/CBC/OFB/CFB/ECBPAD/CBCPAD/OFBPAD/CFBPAD] infile outfile
            (file 'key.dat' contains UserKey and IV)
[indra@indra des]$

±×·³ ÁÁÀº ÇÏ·ç µÇ½Ã±æ..
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>ÄÄÆÄÀÏ µÇ°Ô µµ¾Æ ÁÖ¼¼¿©....
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>¾Ë°í¸®ÁòÀº ÀÚ·á½Ç¿¡ des.ZIPÀ¸·Î ¿Ã·Á ³õ¾Ò½À´Ï´Ù...
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>¸®´ª½º¿Í C Ãʺ¸¿¡°Õ Á¤¸» ¾î·Á¿î ¹®Á¦ÀÔ´Ï´Ù...

  Hit : 5776     Date : 2003/10/06 03:53



    
hkpco Èæ.. ¾Ë°í¸®ÁòÀº ¾î·Á¿ö ^0^ 2003/10/06  
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