ARA
SEMİNER 1
Tarih: 30 Aralık 2015 Çarşamba,
Saat: 10:00
Yer: E-2031
Konuşmacı: Dr. Mehmet Sabır KİRAZ
Başlık: Verifiable Secret Sharing
Özet:"Secret sharing is an important primitive in cryptography. In general, a trusted dealer distributes the secret among the participants during the distribution protocol and the secret is recomputed by a subset of the participants during a reconstruction protocol. However, the root of trust is a challenge since one has to trust someone (which is a dealer in this case). Furthermore, a malicious dealer can distribute incorrect and inconsistent shares while the malicious participants may input incorrect shares during the reconstruction protocol. Therefore, it is important to avoid the trusted dealer and prevent malicious shareholders from computing incorrect output without being detected. The property of public verifiability allows that anybody (including the participants) can assure that their own shares are computed in a correct manner. We note that threshold cryptography is carried out with the secret sharing schemes.
In this talk, we will give a brief introduction to standard secret sharing schemes and then extend the general scheme to publicly verifiable secret sharing without using a trusted dealer. Finally, we present some threshold homomorphic encryption schemes and their practical implications in practice."
SEMİNER 2
Tarih: 30 Aralık 2015 Çarşamba,
Saat: 11:00
Yer: E-2031
Konuşmacı: Dr. Osmanbey UZUNKOL
Başlık: Arithmetical Secret Sharing
Özet: Abstract: Secret sharing is a cryptographic mechanism allowing to distribute shares among different parties. This is achieved by a trusted dealer in such a way that only authorized subset of parties can determine the secret. Unlike conventional cryptographic schemes, secret sharing schemes enable the user
to biometric authentication schemes.