How to hash a string: Difference between revisions
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== Example 1. == |
== Example 1. == |
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Sometimes it is useful to make a number that represents string. This is usually called an ''hash'', one of its properties is that if you change the string a tiny bit the hash number becomes quite different. |
Sometimes it is useful to make a number that represents string. This is usually called an ''hash'', one of its properties is that if you change the string a tiny bit the hash number becomes quite different.<syntaxhighlight lang="smalltalk"> |
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'Hello world' hash. "=> 136137888 " |
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== Example 2. MD5 == |
== Example 2. MD5 == |
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WebUtils md5Digest: 'foobar'. "=>" '3858F62230AC3C915F300C664312C63F' |
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'''Exercise'''. Try to hash 'Hello World' and see how much different it is. |
</syntaxhighlight>'''Exercise'''. Try to hash 'Hello World' and see how much different it is. |
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'''Exercise'''. Explore the ''Cryptography-DigitalSignatures'' package for another implementation of the hashing function. |
'''Exercise'''. Explore the ''Cryptography-DigitalSignatures'' package for another implementation of the hashing function. |
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Latest revision as of 20:09, 12 May 2025
Example 1.
Sometimes it is useful to make a number that represents string. This is usually called an hash, one of its properties is that if you change the string a tiny bit the hash number becomes quite different.
'Hello world' hash. "=> 136137888 "
Example 2. MD5
WebUtils md5Digest: 'foobar'. "=>" '3858F62230AC3C915F300C664312C63F'
Exercise. Try to hash 'Hello World' and see how much different it is.
Exercise. Explore the Cryptography-DigitalSignatures package for another implementation of the hashing function.