An Attack on the Last Two Rounds of MD4

نویسندگان

  • Bert den Boer
  • Antoon Bosselaers
چکیده

In (RiveSO] the MD4 message digest algorithm was introduced taking an input message of arbitrary length and producing an output 128-bit message digest. It is conjectured that it is computationally infeasible to produce two messages having the same message digest, or to produce any message having a given prespecified target message. In this paper it is shown that if the three round MD4 algorithm is stripped of its first round, it is possible to find for a given (initial) input value two different messages hashing to the same output. A computer program implementing this attack takes about 1 millisecond on a 16 Mhe IBM PS/2 to find such a collision.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

An Attack on the Last Two Rounds of MD 4 Bert den

In Rive90] the MD4 message digest algorithm was introduced taking an input message of arbitrary length and producing an output 128-bit message digest. It is conjectured that it is computationally infeasible to produce two messages having the same message digest, or to produce any message having a given prespeciied target message. In this paper it is shown that if the three round MD4 algorithm i...

متن کامل

Collisions and Near-Collisions for Reduced-Round Tiger

We describe a collision-finding attack on 16 rounds of the Tiger hash function requiring the time for about 2 compression function invocations. This extends to a collision-finding attack on 17 rounds of the Tiger hash function in time of about 2 compression function invocations. Another attack generates circular near-collisions, for 20 rounds of Tiger with work less than that of 2 compression f...

متن کامل

Preimage Attacks on Reduced Tiger and SHA-2

This paper shows new preimage attacks on reduced Tiger and SHA-2. Indesteege and Preneel presented a preimage attack on Tiger reduced to 13 rounds (out of 24) with a complexity of 2. Our new preimage attack finds a one-block preimage of Tiger reduced to 16 rounds with a complexity of 2. The proposed attack is based on meet-in-themiddle attacks. It seems difficult to find “independent words” of ...

متن کامل

Finding collisions for MD4 hash algorithm using hybrid algorithm

The modification of message that meets the sufficient conditions for collision is found in the last step of differential attack proposed by Wang et all. (2005) on MD4 hash algorithm. Here we show how this attack phase, finding a collision starting from the list of sufficient conditions for the collision, can be implemented using a combination of two algorithms evolutionary algorithm and hill cl...

متن کامل

Inverting Thanks to Sat Solving

The SATisfiability Problem is a core problem in mathematical logic and computing theory. The last decade progresses have led it to be a great and competitive approach to practically solve a wide range of industrial and academic problems. Thus, the current SAT solving capacity allows the propositional formalism to be an interesting alternative to tackle cryptanalysis problems. This paper deals w...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 1991