硬盤加密--解析二

原創

2020-02-21 05:59

在對硬盤主引導記錄熟悉之後，就可以編出很多種硬盤加密程序（完全取決於你自已的需要），隨着硬盤容量越來越大，其實我們可以將硬盤分爲兩個盤，一個是C盤，一個是D盤，平時將C盤重要的文件拷貝至D盤，並將D盤加鎖，這樣當C盤受到破壞時，就可以解鎖D盤，將D盤上存儲的文件恢復過來，我下面的程序就是以這一原理來編寫的，請看代碼：
Announcement:You can use any editor to edit source codes,such as Notepad,QE,Edit and so on.
Source Codes:
data segment
    FQB DB 512 dup(0);To define a buffer,which will be used to store harddisk's MBR
    MESSAGE1 DB 0DH,0AH,"C------------LOCK C"
             DB 0DH,0AH,"D------------LOCK D"
             DB 0DH,0AH,"E------------Exit"
             DB 0DH,0AH,"Enter your selection!$"
    MESSAGE2 DB 0DH,0AH,"OK!$"
    MESSAGE3 DB "NOT FOUND DRIVE D!$"
    ERROR    DB "ENTER ERROR!$"
    IOERROR DB "HARDDISK I/O ERROR!$"
    CXD      DW 0
data ends
stack segment
        DB 512 dup(0)
stack ends
code segment
     assume cs:code,ds:data,ss:stack
   START:
      mov AX,0201
      mov BX,OFFSET FQB
      mov CX,0001
      mov CXD,CX
      mov DX,0080
      INT 13;Read Main Boot Record,which is in 0 Header,0 Cylinder,1 Sector
      JB ERR
      MOV DX,OFFSET MESS1
      MOV AH,9
      INT 21
AA0: ;Accept user's enter
      MOV AH,1
      INT 21
      CMP AL,'E';Exit
      JZ EXIT
      CMP AL,'e';Exit
      JZ EXIT
      CMP AL,'C';Lock Drive C
      JZ LockC
      CMP AL,'c';Lock Drive C
      JZ LockC
      CMP AL,'D'
      JZ LockD;//Lock Drive D
      CMP AL,'d'
      JZ LockD;//Lock Drive D
      LEA DX,ERROR;Enter Error
      MOV AH,9
      INT 21
      JMP EXIT
LockC:
      MOV AH,55H
      CLD
      MOV SI,OFFSET FQB
      MOV DI,SI
      MOV CX,01FE
AA1:
      LOADSB
      XOR AL,AH
      ROL AH,1
      STOSB;//Encrypt Partition-Table
      LOOP AA1
AA3:
      MOV AX,0301
      MOV BX,OFFSET BUF
      MOV CX,CXD
      MOV DX,0080
      INT 13
      JB ERR
      LEA DX,MESSAGE2
      MOV AH,9
      INT 21
      MOV AX,0040;Reset
      MOV DS,AX
      MOV AX,1234
      MOV SI,0072
      MOV [SI],AX
      JMP FFFF:0000
      INT 20
LockD:
      CMP BYTE PTR [BUF+1D0],0
      JNZ AA2
      MOV DX,MESSAGE3;No Drive D
      MOV AH,9
      INT 21
      JMP EXIT
AA2:
      MOV AX,0201
      MOV BX,OFFSET BUF
      MOV CX,WORD PTR [BUF+1D0];Read Logic Drive D Partition-Table
      MOV DX,0080
      INT 13
      JB ERR
      JMP LockC
ERR:
     MOV DX,OFFSET IOERROR
     MOV AH,9
     INT 21
EXIT:
     MOV AH,4CH
     INT 21