What are the hash algorithms?

Hash algorithm shortens input data into hash values ​​for fast data lookup and comparison. Commonly used hash algorithm types include MD5, SHA-1, SHA-256, SHA-512 and BLAKE2 for dispersed hash tables; CRC-32 and CRC-64 for cyclic redundancy check; Bloom filter, Cook Library algorithm and Linden algorithm are used for irregular hashing.

Types of Hash Algorithms

A hash algorithm is the process of shortening the length of input data by mapping it to a fixed-size hash value. A hash is a unique identifier used to quickly find and compare data. The following are commonly used types of hashing algorithms:

1. Scattered Hash Table

• MD5 (Message Digest 5): Widely used to generate 128-bit hash values ​​for verifying file integrity and creation digital signature.
• SHA-1 (Secure Hash Algorithm 1): Generates a 160-bit hash value, enhancing the security of MD5.
• SHA-256: Generates a 256-bit hash value. It is one of the most commonly used hashing algorithms and has high security.
• SHA-512: Generates a 512-bit hash, often used in applications that require higher security.
• BLAKE2: A fast and secure hashing algorithm that generates 256-bit or 512-bit hashes.

2. Cyclic Redundancy Check (CRC)

• CRC-32: A 32-bit hashing algorithm widely used for data transmission and storage.
• CRC-64: A 64-bit hash algorithm with stronger error detection capabilities than CRC-32.

3. Irregular Hashing

• Bloom Filter: A probabilistic data structure used to quickly determine whether an element is in a set.
• Cook Library Algorithm: A collision-free hash table that minimizes collisions by mapping keys to multiple hash buckets.
• Linden Algorithm: A hashing algorithm that utilizes a collision-free hash table to quickly find data.

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