About MD4

MD4 (Message Digest 4) is a cryptographic hash function developed by Ronald Rivest in 1990. It processes messages in 512-bit blocks and produces a 128-bit hash value, typically represented as a 32-character hexadecimal string. Although MD4 was once widely used, significant vulnerabilities have been discovered, making it insecure for modern applications.

MD4 is notable for its speed and simplicity, which influenced the design of later hash functions such as MD5, SHA-1, and SHA-2. However, it is no longer considered secure due to the discovery of collision attacks that can produce two different messages with the same hash value.