I am actually working upon a project where I need to generate a unique id for unique string as input given. I have read about UUID's but the problem is I want a FIXED but unique id for a specific input and not an id which changes every new time that same input is entered . Basically, for maybe thousands of different string OF varying lengths as inputs, I need a fixed but unique id for each string input. How do I do it?
Thanks in advance.
You could make a dictionary and add each string in loop. Every sting wil hold an ID, when you want to add new strings, check if the exist in your dictionary, if so then do nothing, if now then add the new string and give it a new ID- the size of the dictionary +1.
If you want to retrieve the ID of a string, simply call it from the dictionary.
@Itzik Goussha I actually have names of songs as inputs which have varying lengths and there are like thousands of songs into play right now... I am actually searching to implement something similar to UUID in python with the difference that it keeps the id of one song the same no matter how many times it is called
Hash functions would match perfectly for the solution of this issue.
And if the performance is of importance it's better to use ones, those weren't designed for cryptographic purposes.
@Yurii Baryshev But do the hash functions not need a constant length of input? Because the songs I am talking about may have names of varying lengths. So do we not need to first compute their names to a standard key and then use hash functions to encode them? I am looking to produce that key of standard length which will serve as an input to hash function.
At least that's what I have in mind and from what I know.
Thanks for your inputs anyways.
Ayush Agrawal , No they don't need the constant inputs length. On the contrary - producing the fixed length output for arbitrary length input data is the very hash functions' definition )))
The very first sentence from Wiki about hash functions
"A hash function is any function that can be used to map data of arbitrary size to fixed-size values."
I agree with Yuri. Hash is like they do in deduplication. Several patents on this by Lillibridge and Eshghi of HP/HPE Labs.
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