Hash vs Hashlib

[nikoleta-v3]

Hash vs Hashlib

[drvinceknight]

Sounds sensible to me 👍

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On Mon, 28 Nov 2016, 10:24 Nikoleta, ***@***.***> wrote: I will be using hashlib.md5() because it seems more appropriate for hashing and a collusion is more unlikely to happen. — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#7 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ACCGWrcPmG4el0ppFeI8vXNAwEQH738gks5rCqvxgaJpZM4K9Qmr> .

[Nikoleta-v3]

This post closes the issue: http://stackoverflow.com/questions/7646520/is-this-an-appropriate-use-of-pythons-built-in-hash-function

[drvinceknight]

The conclusion from that issue is not immediate. What have you concluded, perhaps note the reasons here, when it comes to writing this detail up you'll regret not having summarized things.

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On Sun, 27 Nov 2016, 21:16 Nikoleta, ***@***.***> wrote: Closed #7 <#7>. — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#7 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ACCGWpDCQNSsiATyKW72uNNqeo5eTKhPks5rCfM6gaJpZM4K9Qmr> .

[drvinceknight]

Also that post is just one opinion. When a reviewer or examiner says 'why did you do that?', 'stackoverflow' won't be a good answer.

[Nikoleta-v3]

• hash() built in function returns the hash value of the object (if it has one) of 64-bit. The 64-bit It is mainly used to quickly compare dictionary keys during a dictionary lookup. Hash() is randomised by default each time you start a new instance.

• hashlib has 2 sets of functions:

  • MD5: Message digest algorithm producing a 128 bit hash value. This is widely used to check data integrity. It is not suitable for use in other fields due to the security vulnerabilities of MD5.
  • SHA: Group of algorithms designed by the U.S's NSA that are part of the U.S Federal Information processing standard. These algorithms are used widely in several cryptographic applications. The message length ranges from 160 bits to 512 bits.

Because we are not doing cryptography and 128 bit should be enough to avoid collusion for our data base, MD5 should be appropriate for us to use. Also I have checked that it returns same hash.

[drvinceknight]

So what's your conclusion?

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On Sun, 27 Nov 2016, 22:34 Nikoleta, ***@***.***> wrote: - hash() built in function returns the hash value of the object (if it has one) of 64-bit. The 64-bit It is mainly used to quickly compare dictionary keys during a dictionary lookup. Hash() is randomised by default each time you start a new instance. - hashlib has 2 sets of functions: - MD5: Message digest algorithm producing a 128 bit hash value. This is widely used to check data integrity. It is not suitable for use in other fields due to the security vulnerabilities of MD5. - SHA: Group of algorithms designed by the U.S's NSA that are part of the U.S Federal Information processing standard. These algorithms are used widely in several cryptographic applications. The message length ranges from 160 bits to 512 bits. — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#7 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ACCGWqvIy4R22NTWBbfTHo_SBOsr7PHJks5rCgVYgaJpZM4K9Qmr> .

[Nikoleta-v3]

I will be using hashlib.md5() because it seems more appropriate for hashing and a collusion is more unlikely to happen.