Hashing: Difference between revisions
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A hash function is any function that can be used to map data of arbitrary size to fixed-size values. The values returned by a hash function are called hash values, hash codes, digests, or simply hashes. The values are used to index a fixed-size table called a hash table. Use of a hash function to index a hash table is called hashing or scatter storage addressing.<ref>https://en.wikipedia.org/wiki/Hash_function</ref> | A hash function is any function that can be used to map data of arbitrary size to fixed-size values. The values returned by a hash function are called hash values, hash codes, digests, or simply hashes. The values are used to index a fixed-size table called a hash table. Use of a hash function to index a hash table is called hashing or scatter storage addressing.<ref>https://en.wikipedia.org/wiki/Hash_function</ref> | ||
Revision as of 13:26, 8 March 2020
A hash function is any function that can be used to map data of arbitrary size to fixed-size values. The values returned by a hash function are called hash values, hash codes, digests, or simply hashes. The values are used to index a fixed-size table called a hash table. Use of a hash function to index a hash table is called hashing or scatter storage addressing.[2]
Hashing is the transformation of a string of characters into a usually shorter fixed-length value or key that represents the original string. Hashing is used to index and retrieve items in a database because it is faster to find the item using the shorter hashed key than to find it using the original value. It is also used in many encryption algorithms.[3]
Simple Code sample[edit]
# this python file should be used as part of your process to understand hashing.
# please change values so you can see how hashing works!
myString = "Hello there"
print("Before Hash: ", myString)
myHashedString = hash(myString)
print("After Hash: ", myHashedString)
Videos[edit]
This video will give you a general introduction to hashing.
The video below helps us understand hashing within the context of blockchain.