Widely adopted in blockchain technology for safety and verifying data integrity, cryptographic hash functions ensure security by serving as secret codes that consist of alphanumeric characters. A hash algorithm outputs a unique string of letters and numbers, ensuring that even a tiny change results in a completely different code.
The hash output of cryptographic hash functions cannot be reversed to generate the original input data. While two different inputs can theoretically generate the same hash value (collision), the process requires a vast amount of computational energy. A robust cryptographic hash function is collision-resistant and virtually impossible to decrypt.
Secure Hash Algorithm (SHA) is one of the most commonly used hash functions for encryption, helping protect data, digital signatures, and communications. Cryptographic hash functions with strong collision resistance include SHA-256 or SHA-3. These two are recommended for storing passwords. SHA-1 is a good example of a weak hash function because of its weak collision resistance.
