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 以其速度和简单性而著称，这影响了后来的哈希函数（如 MD5、SHA-1 和 SHA-2）的设计。但是，由于发现了冲突攻击，这些攻击可以生成具有相同哈希值的两个不同消息，因此它不再被认为是安全的。