Browsing by Subject "Electronic document identification systems"

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    Capture resilient ElGamal signature protocols
    (Springer, 2006-11) Acan, Hüseyin; Kaya, Kamer; Selçuk, Ali Aydın
    One of the fundamental problems of public key cryptography is protecting the private key. Private keys are too long to be remembered by the user, and storing them in the device which performs the private key operation is insecure as long as the device is subject to capture. In this paper, we propose server-assisted protocols for the ElGamal signature scheme which make the system capture resilient in the sense that the security of the system is not compromised even if the signature device is captured. The protocols also have a key disabling feature which allows a user to disable the device's private key in case both the device and the password of the user are compromised simultaneously. © Springer-Verlag Berlin Heidelberg 2006.
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    Threshold cryptography based on asmuth-bloom secret sharing
    (Springer, 2006-11) Kaya, Kamer; Selçuk, Ali Aydın; Tezcan, Zahir
    In this paper, we investigate how threshold cryptography can be conducted with the Asmuth-Bloom secret sharing scheme and present two novel function sharing schemes, one for the RSA signature and the other for the ElGamal decryption functions, based on the Asmuth-Bloom scheme. To the best of our knowledge, these are the first threshold cryptosystems realized using the Asmuth-Bloom secret sharing. The proposed schemes compare favorably to the earlier function sharing schemes in performance as well as in certain theoretical aspects. © Springer-Verlag Berlin Heidelberg 2006.