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Challenges that involve summarizing a large amount of data in a single, much smaller number.

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This is the robbers thread of this cops and robbers challenge. The cops thread is here. Related, but hashes numbers instead of strings and uses a different scoring system. Definitions A hash collision ...
The Empty String Photographer's user avatar
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7 votes
1 answer
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This is the cops thread of this cops and robbers challenge. The robbers thread is here. Related, but hashes numbers instead of strings and uses a different scoring system. Definitions A hash collision ...
The Empty String Photographer's user avatar
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31 votes
30 answers
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With challenges like Output with the same length as the code and Create output twice the length of the code, I thought of a separate, but similar challenge. The task is to produce an output. It can ...
maxb's user avatar
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1 vote
4 answers
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This riddle was inspired by that thread. Consider that you are super-hacker and try to break MD5 hashing algorithm by looking for a hash collisions for a given hash string which your friend gave to ...
Agnius Vasiliauskas's user avatar
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14 votes
8 answers
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Imagine we have some polyomino and would like to uniquely identify them, however the polyominos can be rotated, so blindly hashing them won't give us the same fingerprint for a piece and a rotation ...
ბიმო's user avatar
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Consider you have a hash function \$\mathcal{H}\$ which takes strings of length \$2n\$ and returns strings of length \$n\$ and has the nice property that it is collision resistant, i.e. it is hard to ...
Laikoni's user avatar
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13 votes
15 answers
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Make a program that simulates the basic logic gates. Input: An all-caps word followed by 2 1 digit binary numbers, separated by spaces, such as OR 1 0. The gates <...
qazwsx's user avatar
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36 votes
19 answers
4k views

According to RollingStone, below are the 26 greatest singers of all time: ...
Arnauld's user avatar
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9 votes
9 answers
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The challenge is simple Write a script that, when given a string input, will hash the string using the MD2 hashing algorithm, and then return either a positive integer or negative integer output ...
Mayube's user avatar
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20 votes
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Background On this site, we occasionally have questions requiring programs to be "radiation hardened"; this means that the program has to be able to survive the deletion of one or more bytes, no ...
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10 votes
5 answers
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XKCD Comic: Goal: Given a date, the current Dow Opening, and your current coordinates as a rounded integer, produce a "geohash." Input: Input through any reasonable means (STDIN, function argument, ...
Julian Lachniet's user avatar
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36 votes
10 answers
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Background The computer game NetHack dates from 1987, before the use of graphics in computer games was widely established. There are lots of monsters in the game, and potentially a lot need to fit on ...
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Given a sequence of bytes, output the SHA-256 hash value of the sequence. The SHA-256 Algorithm The following pseudocode is taken from the Wikipedia page for SHA-2. ...
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9 answers
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Credits This challenge originated from @miles. Create a function that computes the CRC32 hash of an input string. The input will be an ASCII string of any length. The output will be the CRC32 hash of ...
Leaky Nun's user avatar
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In this code-challenge you will write a hash function in 140 bytes1 or less of source code. The hash function must take an ASCII string as input, and return a 24-bit unsigned integer ([0, 224-1]) as ...
orlp's user avatar
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17 votes
5 answers
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In the Bitcoin protocol, 2016 is a very special number. The "difficulty" of finding a hash to create a new block is adjusted every 2,016 blocks to approximate changing once every two weeks. This ...
Joe Z.'s user avatar
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2 votes
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Challenge: make a program that outputs a MD5 hash of its source code. You should not use tricks that would be considered cheating in a quine sense (discussed here). Using built-in functions and ...
anatolyg's user avatar
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This contest is over. There are no remaining crackable answer in the cops challenge. Companion thread of Cryptographic hash golf As a reminder, here are the rules for robbers from the main ...
Dennis's user avatar
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35 votes
23 answers
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This contest is over. Due to the nature of cops-and-robbers challenges, the cops challenge becomes a lot easier when the interest in the associated robbers challenge has diminished. Therefore, ...
Dennis's user avatar
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10 votes
6 answers
554 views

My friend and I have this game that we play with words. It is a fun pastime and it involves "canceling out" letters in a word until there is nothing left. I am really tired of him being so ...
Maltysen's user avatar
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8 votes
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The Challenge Create a program that brute-force* decodes the MD5-hashed string, given here: 92a7c9116fa52eb83cf4c2919599c24a which translates to ...
parzivail's user avatar
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8 votes
4 answers
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Hash Un-hashing The basic goal of this challenge is to exploit the high probability of collision in the Java Hash function to create a list of plausible inputs that created an outputted hash. The ...
jocopa3's user avatar
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-2 votes
3 answers
859 views

So you are tasked with creating an open source password authentication system but you want to reveal as little about the implementation of the hash function as possible. Can you write a function that ...
ford prefect's user avatar
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66 votes
20 answers
8k views

This Code Golf was inspired by the recent Daily WTF article You Can't Handle the True!, which features a string comparison written as: ...
dan04's user avatar
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6 votes
10 answers
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Your goal is to write a hash function, that accepts morse code character and returns a hash code that you get to define. You can be sure, passed string will be: One of the Latin characters (A-Z) ...
awesoon's user avatar
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15 votes
7 answers
2k views

This question involves taking input in Morse code as . (period) and - (minus symbol), with spaces to separate the input. Your task is to convert the code to standard output. You can assume that the ...
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15 votes
5 answers
1k views

The goal of this code-golf is to create a program that takes a string as input, and you have to output the SHA-1 hash value as a hexadecimal number. You can find the pseudocode for SHA-1 here Other ...
user3094403's user avatar
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