1581, 5/80 ȸ  α  
   twinz
   - 3

http://www.hackerschool.org/HS_Boards/zboard.php?id=Free_Lectures&no=815 []


6.

Bit - ̴. 0 1 ̷ 2 ٰ ̷.

Nibble - 4 Ʈ Nibble ̷ 1 Nibble 16 ǥ 1ڸ ǥ ִ.

Byte - 8 Ʈ Byte ̷. 1Byte ڸ ǥ 8Ʈ (AH,AL,BH,BL,DH...) ǥҶ ִ.

Word - 16 Ʈ Word ̷. 1Word 16Ʈ (AX,BX,IP,ES...) ǥҶ ִ.

DWord - 32 Ʈ DWord ̷. 1DWord 32Ʈ (EAX,EBX,EIP,EES...) ǥҶ ִ.

QWord - 64 Ʈ QWord ̷. 1QWord ַ EAX:EDX ǥҶ Ƿ 64Ʈ°͸ صε .



7. ּ

Ʒ 츦 غ.

MOV EAX, [00000030]

׸Ʈ شϴ ּ EAX ϶ ε ּ

00000030h ұ?

ּҸ Ҷ ̷ ʴ´.

EDS° ־.

׸Ʈ ͵ α׷ ͼ׸Ʈ ּҸ ϰ ִ°

, Ư EDS( ׸Ʈ) ͸ ϰ ִ ּ ó ġ ˷ش.

EDS 00001030h Ҷ ּ EDS*10h+Offset Ѵ.

, EDS*10h+Offset = (00001030h)*(10h)+(00000030h) = (00010330)h ȴ.

δ 10330h ̴.

⼭ ּҸ ȿ ּ(Effective Address) Ѵ.

, MOV EAX, DWORD PTR DS:[00000030]

쿡 00000030h ȿּҸ ϰ ٷ ȴ.

Ͼÿ ڸ ԵǹǷ ׷

 ׸Ʈ ɼ° ڸ

CODE SEGMENT(ECS) EIP Offset Ѵ.
STACK SEGMENT(ESS) ESP Offset Ѵ.


8. Ʈ

ϴ. ڸ Ȱָ ȴ.

101110̶ 2 ִ. ڸ Ʈ Ű

1011100 Ǵ°̴. ڸ ̵ϸ ȴ. ݴ

Ʈ ϰ Ǹ 10111 ȴ. ű Ʈ Ҷ

ǥغ 2谡 ְų, ְų Ѵٴ ̴.

101110 = 46(Dec), 1011100 = 92(Dec), 10111 = 23(Dec)̴.

ó ڿ غ ʽƮ SHL, ʽƮ SHR̴.

* ʽƮ Ҷ 1 ֵ 0 ֵ ׳ .



** ۱ ڿ ֽϴ.
   , ۱ ǥֽñ ٶϴ.
** Ÿ, ߸ ˷ֽñ ٶϴ :)
** ްڽϴ.

Copyright (c) NEWMS 2007 All right Reserved.
Posted by newms
Studying Area/Reverse Engineering l

  Hit : 6977     Date : 2007/08/27 08:46



    
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1501   - [] ڵ     twinz
08/28 7976
1500   - [] α׷ ڵ庸ȣ (1)     twinz
08/28 10322
1499   - [] α׷ ڵ庸ȣ (2)     twinz
08/28 7851
1498   - []      twinz
08/28 7672
1497   - [ȳƮ] Ű[4]     twinz
08/28 9119
1496   - [ȳƮ] Ʈij (1)     twinz
08/28 7950
1495   - [ȳƮ] Ʈij (2)     twinz
08/28 9432
1494   - [ȳƮ] [1]     twinz
08/28 7593
1493   - ǻ ̷ [1]     twinz
08/27 8674
1492   - ϵ 4.0 ̾ [2]     twinz
08/25 8575
1491   - û , ŷ Ұ ̿´     twinz
08/25 7985
1490   - ɾ      twinz
08/27 9245
1489   - õǴ Ĵ庸     twinz
08/27 6990
1488   - ڸ 50      twinz
08/27 9408
1487   - ý      twinz
08/27 6942
1486   - 1[1]     twinz
08/27 8923
1485   - 2     twinz
08/27 8806
  - 3[1]     twinz
08/27 6976
1483   0 弽ϰ..[2]     ROK.AF
03/02 7976
1482   1[1]     õ
08/31 4706
[1][2][3][4] 5 [6][7][8][9][10]..[80]

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