The hash functions must be computationally efficient.It can be any data, of any size but the hash value will always be fixed. The basic idea behind cryptographic hashing is to take an arbitrary block of data and return a fixed “hash” value. SHA-256 is not much more complex to code than SHA-1 and has not yet been compromised in any way. SHA-2 is one of the successor hash functions to SHA-1 and is one of the strongest hash functions available. They differ in both constructions and in the bit-length of the signature. SHA-1 and SHA-2 are two different versions. It is suitable for password validation, challenge hash authentication, anti-tamper, digital signatures, etc. It is usually represented as a hexadecimal number of 64 digits. The algorithm produces an almost-unique, fixed-size 256-bit (32-byte) hash value. SHA-256 or SHA-2 is the modern cryptographic standard for online security. A one-way hash can be generated from any piece of data, but the data cannot be generated from the hash. Cryptographic hash functions are mathematical operations run on digital data by comparing the computed "hash" (the output from execution of the algorithm) to a known and expected hash value, a person can determine the data's integrity. SHA-256 is a member of the SHA-2 cryptographic hash functions designed by the NSA. This free SHA256 online generator allows you to generate a SHA256 (32-byte) hash of any string or input value, which is then returned as a hexadecimal number of 64 digits.
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