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bcrypt is a key derivation function for password s designed by Niels Provos and David Mazières , based on the Blowfish cipher , and presented at USENIX in 1999 .
 Niels Provos, USENIX
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Niels Provos, USENIX