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The security of all cryptographic algorithms and protocols is b ased on the confidentiality of secret keys. Key management mechanism is an indispensable part of the cryptographic system and this deals with the generation, exchange, storage, use, and replacement of keys. Within the key management mechanism there are key derivation functions (KDFs) which derive one or more keys from a master key. NIST specifies three families of P RF-based KDFs in SP 800-108. In this paper, we examine the difference of security models between the KDFs and the encrypti on modes of operations. Moreover we focus on the provable security of PRF-based KDFs according to input types of counters , and show that the counter and feedback modes of KDFs using XOR of counters are insecure, while these modes using concatenation of counters are secure.Keywords: Key Derivation Functions, KDF, Provable Security, PRF, Encrypti on modes of operation. I.  *       (2015 3 4), (2015 4 27)*  2014 ()  -・

Provable Security of PRF-based Key Derivation Functions according to Input Types of Counters