16 lines
1 KiB
Text
16 lines
1 KiB
Text
This module maintains a concept of a current selection of entropy source.
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Algorithms that require entropy, such as those in Data::Entropy::Algorithms, can
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use the source nominated by this module, avoiding the need for entropy source
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objects to be 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 explicit entropy
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source parameter would rarely vary. There is also a default entropy source,
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avoiding the need to explicitly configure a source at all.
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If nothing is done to set a source then it defaults to the use of Rijndael (AES)
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in counter mode (see Data::Entropy::RawSource::CryptCounter and
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Crypt::Rijndael), keyed using Perl's built-in rand function. This gives a data
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stream that 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 difficult
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to detect the correlation between parts of the pseudo-entropy stream. If more
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true entropy is required then it is necessary to configure a different entropy
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source.
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