About MURMUR3F hash
It seems there might be some confusion or misinformation regarding "MURMUR3F." MurmurHash, specifically Murmur3, is typically categorized into Murmur3A and Murmur3B variants, optimized for different output sizes (32-bit, 64-bit, and 128-bit hashes). Murmur3F, however, does not appear to be a standard or recognized variant within the MurmurHash family.
To clarify the standard Murmur3 variants:
Murmur3A: This variant is optimized for generating 32-bit or 64-bit hash outputs. It processes data in chunks of 4 bytes (32-bit) or 8 bytes (64-bit), using a mix of bitwise rotations, XOR operations, and multiplications with a prime constant.
Murmur3B: Designed for producing a fixed 128-bit hash output, Murmur3B improves upon Murmur3A by adding a finalization step that further mixes the bits to enhance the distribution (avalanche effect) of hash values.
Characteristics of Murmur3A and Murmur3B
Output Sizes: Murmur3A can produce 32-bit or 64-bit hash values, while Murmur3B produces a fixed 128-bit hash value.
Initialization: Both variants start with an initial seed value, allowing users to control the starting point of the hash computation.
Hash Calculation: Murmur3A and Murmur3B process data in chunks and apply specific mixing functions to each chunk, ensuring that small changes in input data result in significantly different hash values.
Usage and Implementation
Applications: MurmurHash, including Murmur3A and Murmur3B, is widely used in applications requiring fast and efficient hash functions, such as hash tables, hash-based lookups, and data partitioning in distributed systems.
Implementation: Implementing Murmur3A or Murmur3B is straightforward due to their well-defined algorithms, making them popular choices in software libraries and frameworks.
Security Considerations
- MurmurHash, including Murmur3A and Murmur3B, is designed for speed and distribution but is not suitable for cryptographic purposes due to its predictability and susceptibility to collision attacks.
Summary
While Murmur3F isn't a recognized variant within the MurmurHash family, Murmur3A and Murmur3B are well-established hash functions known for their efficiency and reliability in generating hash values for non-cryptographic purposes. They are favored in scenarios where quick computation and good distribution of hash values are needed, but where cryptographic security is not a requirement.