Defined range[ edit ] It is often desirable that the output of a hash function have fixed size but see below. This method may produce a sufficiently uniform distribution of hash values, as long as the hash range size n is small compared to the range of the checksum or fingerprint function. SHA-1 works by feeding a message as a bit string of length less than bits, and producing a bit hash value known as a message digest. As a general guideline, a hash function should be as seemingly random as possible while still being deterministic and fast to compute. For such data, it is prudent to use a hash function that depends on all characters of the string—and depends on each character in a different way. If n is itself a power of 2, this can be done by bit masking and bit shifting.

## What is hashing algorithm and explain briefly how it works. It's hard to learn from lectures and videos.

Defined range[ edit ] It is often desirable that the output of a hash function have fixed size but see below. This method may produce a sufficiently uniform distribution of hash values, as long as the hash range size n is small compared to the range of the checksum or fingerprint function. SHA-1 works by feeding a message as a bit string of length less than bits, and producing a bit hash value known as a message digest. As a general guideline, a hash function should be as seemingly random as possible while still being deterministic and fast to compute. For such data, it is prudent to use a hash function that depends on all characters of the string—and depends on each character in a different way. If n is itself a power of 2, this can be done by bit masking and bit shifting.

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