20 lines
1.1 KiB
Text
20 lines
1.1 KiB
Text
This module maintains a concept of a current selection of entropy
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source. Algorithms that require entropy can use the source nominated
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by this module, avoiding the need for entropy source objects to be
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explicitly passed around. This is convenient because usually one
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entropy source will be used for an entire program run and so an
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explicit entropy source parameter would rarely vary. There is also a
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default entropy source, avoiding the need to explicitly configure a
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source at all.
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If nothing is done to set a source then it defaults to the use of
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Rijndael (AES) in counter mode (see
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Data::Entropy::RawSource::CryptCounter and Crypt::Rijndael), keyed
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using Perl's built-in rand function. This gives a data stream that
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looks like concentrated entropy, but really only has at most the
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entropy of the rand seed. Within a single run it is cryptographically
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difficult to detect the correlation between parts of the
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pseudo-entropy stream. If more true entropy is required then it is
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necessary to configure a different entropy source.
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WWW: http://search.cpan.org/dist/Data-Entropy/
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