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Network Security – Message Digest 4 Algorithm MD4 Algorithmmd4 convertermd4 crackermd4 generator

Network Security – Message Digest 4 Algorithm MD4 Algorithmmd4 convertermd4 crackermd4 generator

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 Network Security – MD4 (Message Digest 4) Algorithm

 What is MD4 (Message Digest 4)?

MD4 (Message Digest 4) is a cryptographic hash function developed by Ronald Rivest in 1990. It generates a 128-bit hash value from an input message and is primarily used in digital signatures and checksums. However, MD4 is now considered insecure due to vulnerabilities in cryptographic attacks.

Features of MD4 Algorithm

Fixed-Length Output → Generates a 128-bit (32-character hexadecimal) hash.
Deterministic → Same input will always produce the same hash.
Fast Computation → Optimized for 32-bit machines.
Used in Older Cryptographic Systems → Formerly used in NTLM (Windows authentication).

 MD4 Algorithm Working Process

MD4 processes input data in 512-bit blocks and follows these steps:

Step 1: Padding

Step 2: Initialize MD4 Buffer

MD4 maintains four 32-bit registers initialized to fixed values:

A = 0x67452301
B = 0xEFCDAB89
C = 0x98BADCFE
D = 0x10325476

Step 3: Processing in 512-bit Blocks

Each block undergoes three rounds of transformation using bitwise operations (AND, OR, XOR, NOT) and addition.

Step 4: Output Hash Generation

After processing all blocks, the final 128-bit hash value is obtained.

 Example of MD4 Hash Generation

Input: "Hello, World!"
MD4 Hash Output: 9483943844618615d931545f19e1d082

Input: "hello, world!" (small change)
MD4 Hash Output: ecab58c5d441eac0e5f9e4a4b8914f4b

Even a tiny change in input produces a completely different hash (Avalanche Effect).

 MD4 Algorithm in Python

You can generate an MD4 hash using the hashlib library:

import hashlib

message = “Hello, World!”
md4_hash = hashlib.new(‘md4’, message.encode()).hexdigest()

print(“MD4 Hash:”, md4_hash)

Output: 9483943844618615d931545f19e1d082

 MD4 Security Issues

MD4 is no longer secure due to the following reasons:
Collision Attacks → Hackers can generate two different inputs with the same hash.
Fast Computation → Makes brute-force attacks easier.
Broken by Cryptanalysis → Modern attacks can break MD4 in milliseconds.

 MD4 Cracking & Alternatives

 Conclusion

 MD4 was once widely used in cryptographic applications but is no longer secure.
 It is still used for legacy applications, but modern security systems avoid MD4.
Better Alternatives → SHA-256, SHA-3, Bcrypt, Argon2.

 Would you like a comparison between MD4 and modern hashing algorithms?

Network Security: MD4 (Message Digest 4) Algorithm Explained

The MD4 algorithm is a cryptographic hash function designed to produce a 128-bit hash value from an arbitrary length of data. It was developed by Ronald Rivest in 1990 and is a predecessor to MD5 and other modern hash algorithms.


1. What is MD4 (Message Digest 4)?


2. MD4 Algorithm Steps (Simplified)

MD4 works in three rounds of complex bitwise operations on 512-bit message blocks.

Step-by-Step:

  1. Padding:
    Append padding bits to make the message length congruent to 448 mod 512. Padding starts with 1 followed by 0s.

  2. Appending Length:
    Append the original length of the message as a 64-bit number.

  3. Initialize Buffer:
    Four 32-bit variables are initialized:

    • A = 0x67452301

    • B = 0xefcdab89

    • C = 0x98badcfe

    • D = 0x10325476

  4. Process Message in 512-bit Blocks:

    • Break the padded message into 512-bit chunks.

    • Each chunk is processed through 3 rounds, each with 16 operations using functions F, G, and H (nonlinear functions of A, B, C, D).

  5. Final Output:
    The result of all rounds is concatenated into a 128-bit hash.


3. MD4 Tools

MD4 Converter / Generator

MD4 Cracker

Example:

plaintext
Input: "hello"
MD4 Hash: aa010fbc1d14c795d86ef98c95479d17

Security Status of MD4


Summary Table

Feature MD4
Output Size 128 bits
Speed Very Fast
Security Broken (Not Secure)
Year Developed 1990
Inventor Ronald Rivest
Modern Alternatives SHA-2, SHA-3, bcrypt

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