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For a secure communication system, it is necessary to use secure cryptographic algorithms and keys. Modern cryptographic system generates high entropy encryption key through standard key derivation functions. Using recent progress in quantum key distribution(QKD) based on quantum physics, it is expected that we can enhance the security of modern cryptosystem. In this respect, the study on the dual key agreement is required, which combines quantum and modern cryptography. In this paper, we propose two key derivation functions using dual key agreement based on QKD and RSA cryptographic system. Furthermore, we demonstrate several simulations that estimate entropy of derived key so as to support the design rationale of our key derivation functions. ※ This work was supported by ICT R&D program of MSIP/IITP.[10044559, 2014-044-014-002] First Author : Kookmin University Department of Financial Information Security, ruokay@kookmin.ac.kr,  ° Corresponding Author : Kookmin University Department of Math. / Financial Information Security, salt@kookmin.ac.kr,  * Kookmin University Department of Financial Information Security, mypear@kookmin.ac.kr,  ** Kookmin University Department of Math. / Financial Information Security, jskang@kookmin.ac.kr,  :KICS2016-01-024, Received January 31, 2016; Revised April 6, 2016; Accepted April 21, 2016 I.                    .           , The Journal of Korean Institute of Communications and Information Sciences '16-04 Vol.41 No.04 480  1.     Fig. 1. Structure of dual key agreement KDF          .      (Key derivation function,  KDF) .    KDF         NIST SP 800-108 ,   KDF NIST SP 800-132, HMAC  KDF RFC-5869 [3]  . ,        (Quantum key distribution,  QKD)       .  ,   QKD        ,         .              .                 .        ,                  . 1.1       (Dual key agreement)                      Parallel key agreement  .       ID Quantique   CERBERIS       .  CERBERIS         QKD    RSA            . ,     Parallel key agreement     RSA,               .          ,           .     QKD   (Classic channel) RSA-OAEP 2048 [8]   NIST           .    ( HMAC KDF)  NIST SP 800-56C   HMAC     ,    ( Hankel matrix KDF) Leftover Hash Lemma    Hankel matrix  .                      1  .      (Chosen ciphertext attack)       RSA-OAEP 2048     , KDF    QKD     .     HMAC KDF  Hankel matrix KDF          .      3 . 1.2             QKD RSA      . ○HMAC KDF •NIST SP 800-56B SP 800-56C     . •           .

Key Derivation Functions Using the Dual Key Agreement Based on QKD and RSA Cryptosystem