A C implementation of the Tunneling Method by V. Klima to speed up collision search for MD5
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README.md
tunneling.c

README.md

md5-tunneling

A C implementation of the Tunneling Method by V. Klima to speed up collision search for MD5.

About

Based on Multi-Message Modifications Method and Tunnels, the program searches for two 128-bytes messages with same MD5 hash.

The idea of Tunnels to speed up MD5 collisions search is described in: Vlastimil Klima: Tunnels in Hash Functions: MD5 Collisions Within a Minute, sent to IACR eprint, 18 March, 2006 PDF

Other related papers and attack examples can be found here.

Compilation

The Math library needs to be linked

gcc tunneling.c -lm -o md5-tunneling

Functionalities

At compile time, the user can choose to

  • Enable/disable any implemented tunnel
  • Write to disk the two colliding messages as binaries
  • Write to disk a summary of the collision found (message bytes, timings and common hash)
  • Print the colliding hash in summary
  • Print the colliding hash in standard output

A Linear Congruential Generator is implemented as a pseudo-random number generator. The user can set a seed that produces the same collision across different OS and architectures.

The attack is independent from the Init Vector (IV) used by MD5. The user can set the IV he wants and search for a collision for that particular IV.

You can give as input to the program:

  • 1 hex number to specify the seed
md5-tunneling 0x69423840
  • 4 hex numbers to specify the custom IV for MD5
md5-tunneling 0xF0E1D2C3 0xB4A59687 0x78695A4B 0x3C2D1E0F
  • 5 hex numbers to specify the seed and custom IV
md5-tunneling 0x69423840 0xF0E1D2C3 0xB4A59687 0x78695A4B 0x3C2D1E0F