Make a unique filesystem path, without creating the file

Marko Rauhamaa marko at
Mon Feb 22 14:32:44 EST 2016

Jon Ribbens <jon+usenet at>:

> Suppose you had code like this:
>   filename = binascii.hexlify(os.urandom(16)).decode("ascii")
> Do we really think that is insecure or that there are any practical
> attacks against it? It would be basically the same as saying that
> urandom() is broken, surely?

urandom() is not quite random and so should not be considered
cryptographically airtight.

Under Linux, /dev/random is the way to go when strong security is
needed. Note that /dev/random is a scarce resource on ordinary systems.


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