17 lines
933 B
Plaintext
17 lines
933 B
Plaintext
Eksblowfish is a variant of the Blowfish cipher, modified to make
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the key setup very expensive. ("Eks" stands for "expensive key
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schedule".) This doesn't make it significantly cryptographically
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stronger, but is intended to hinder brute-force attacks. It also
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makes it unsuitable for any application requiring key agility. It
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was designed by Niels Provos and David Mazieres for password hashing
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in OpenBSD. See Crypt::Eksblowfish::Bcrypt for the hash algorithm.
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See Crypt::Eksblowfish::Blowfish for the unmodified Blowfish cipher.
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Eksblowfish is a parameterised (family-keyed) cipher. It takes a
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cost parameter that controls how expensive the key scheduling is.
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It also takes a family key, known as the "salt". Cost and salt
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parameters together define a cipher family. Within each family, a
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key determines an encryption function in the usual way. See
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Crypt::Eksblowfish::Family for a way to encapsulate an Eksblowfish
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cipher family.
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