DavidBuchanan314

MD5 Collision with CRC32 Preimage

Here's the scenario: We want to craft two different messages with the same MD5 hash, and a specific CRC32 checksum, simultaneously.

In other words, we want an MD5 collision attack and a CRC32 preimage attack.

This might seem like a contrived scenario, but it's exactly the one I faced while producing my PNG hashquine (Yes OK maybe that's also a contrived scenario, cut me some slack).

On its own, a CRC32 preimage attack is trivial. You can craft a 4-byte suffix that gives any message a specific checksum, calculated using a closed-form expression (which I am too lazy to derive, not even with assistance from Z3). It's not an attack per-se, since CRC32 was never meant to be cryptograpically secure in the first place.

mjtb49

import java.util.*;

public class AdditionUnderXOR {

    static final int SS = 1000000;

    enum Ore {

        COAL(60005),
        IRON(60006),

Dhanvesh

@echo off
title Windows 10 ALL version activator&cls&echo ************************************&echo Supported products:&echo - Windows 10 Home&echo - Windows 10 Professional&echo - Windows 10 Enterprise, Enterprise LTSB&echo - Windows 10 Education&echo.&echo.&echo ************************************ &echo Windows 10 activation...
cscript //nologo c:\windows\system32\slmgr.vbs /ipk TX9XD-98N7V-6WMQ6-BX7FG-H8Q99 >nul
cscript //nologo c:\windows\system32\slmgr.vbs /ipk 3KHY7-WNT83-DGQKR-F7HPR-844BM >nul
cscript //nologo c:\windows\system32\slmgr.vbs /ipk 7HNRX-D7KGG-3K4RQ-4WPJ4-YTDFH >nul
cscript //nologo c:\windows\system32\slmgr.vbs /ipk PVMJN-6DFY6-9CCP6-7BKTT-D3WVR >nul
cscript //nologo c:\windows\system32\slmgr.vbs /ipk W269N-WFGWX-YVC9B-4J6C9-T83GX >nul
cscript //nologo c:\windows\system32\slmgr.vbs /ipk MH37W-N47XK-V7XM9-C7227-GCQG9 >nul
cscript //nologo c:\windows\system32\slmgr.vbs /ipk NW6C2-QMPVW-D7KKK-3GKT6-VCFB2 >nul

baines

#include <stdio.h>
#include <locale.h>
#include <X11/Xlib.h>
#include <X11/keysym.h>

int main(void){

    setlocale(LC_ALL, "");

    Display* dpy = XOpenDisplay(NULL);

williballenthin

radare2

load without any analysis (file header at offset 0x0): r2 -n /path/to/file

• analyze all: aa
• show sections: iS
• list functions: afl
• list imports: ii
• list entrypoints: ie
• seek to function: s sym.main