Fast threshold ECDSA with honest majority

2021 ◽  
pp. 1-30
Author(s):  
Ivan Damgård ◽  
Thomas P. Jakobsen ◽  
Jesper Buus Nielsen ◽  
Jakob Illeborg Pagter ◽  
Michael Bæksvang Østergaard

ECDSA is a widely adopted digital signature standard. A number of threshold protocols for ECDSA have been developed that let a set of parties jointly generate the secret signing key and compute signatures, without ever revealing the signing key. Threshold protocols for ECDSA have seen recent interest, in particular due to the need for additional security in cryptocurrency wallets where leakage of the signing key is equivalent to an immediate loss of money. We propose a threshold ECDSA protocol secure against an active adversary in the honest majority model with abort. Our protocol is efficient in terms of both computation and bandwidth usage, and it allows the parties to pre-process parts of the signature, such that once the message to sign becomes known, they can compute a secret sharing of the signature very efficiently, using only local operations. We also show how to obtain guaranteed output delivery (and hence also fairness) in the online phase at the cost of some additional pre-processing work, i.e., such that it either aborts during the pre-processing phase, in which case nothing is revealed, or the signature is guaranteed to be delivered to all honest parties online.

2009 ◽  
Vol 8 (2) ◽  
pp. 882-889 ◽  
Author(s):  
Caimu Tang ◽  
Dapeng Oliver Wu ◽  
Anthony T. Chronopoulos ◽  
Cauligi S. Raghavendra

2014 ◽  
Vol 1 (2) ◽  
Author(s):  
Syarif Hidayatulloh

Abstract - Data network secure is very important, especially if the data is secret. However, the refuge of the data is usually considered as unimportant thing and less monitored by the user. Because, the data security system is difficult to be applied by the user either in personal computer or in the company. It becomes more important to be applied when the data have been attacked or stolen. It is better for the user to anticipate before it’s too late. There are so many ways to protect data in a network computer. For instance, encryption, digital signature, firewall and so on. Some solutions can be applied to increase security system based on the needs of network. It is caused by other factors in the priority system secure such as performance, network specification, device specification, and the cost. IPsec is one of solution to increase the data computer network secure which is supporting many authentic and encryption methods. IPsec work by processing encryption the data before it has been sent automatically. Thus, although the data was successfully intercepted by a third, then the data would not be useful because the data has been encrypted. IPSec also check the data integrity and authenticity fromthe source. In addition, the more important is the ease of implementation does not require high system requirements and certainly low cost. So, the user can realize to apply the secure system immediately. Keywords: Network security, Data security, IPSec Abstrak - Keamanan lalu lintas data pada jaringan komputer sangatlah penting, terutama jika data bersifat rahasia. Namun keamanan data masih menjadi sesuatu hal yang dirasa kurang panting dan tidak mendapat perhatian dari pengguna komputer. Ini dikarenakan pengamanan data masih dirasakan sulit untuk diterapkan oleh penguna komputer baik pribadi ataupun diperusahaan. Pengamanan data mulai dianggap penting untuk diterapkan ketika telah terjadi penyerangan atau pencurian data. Ini tentunya Sudah terlambat Karena seharusnya kita sebagai pengguna berfikir cara pencegahan bukan mencegah setelah terjadi. Karena hal tersebut akan sangat merugikan. Banyak cara dalam pengamanan data pada sebuah jaringan komputer, misalnya enkripsi, digital signature, firewall dan masih banyak lagi. Beberapa solusi dapat diterapkan untuk meningkatkan keamanan dengan melihat kebutuhan yang sesuai dengan keadaan jaringan yang ada, itu disebabkan karena disamping keamanan yang kita prioritaskan ada faktor-faktor lain seperti Performa, spesifikasi Jaringan, spesifikasi perangkat dan biaya yang Perlu diperhatikan. IPSec merupakan salah satu solusi untuk meningkatkan keamanan data pada jaringan komputer yang mendukung banyak metode otentikasi dan enkripsi. IPSec bekerja dengan melakukan enkripsi pada paket data secara otomatis sebelum dikirimkan. Dengan demikian walaupun data berhasil disadap oleh pihak ketiga maka data tidak akan berguna karena data telah terenkripsi. IPSec pun memeriksa integritas data dan keaslian sumber pengirim. Dan yang lebih penting adalah kemudahan dalam implementasi dengan tidak memerlukan prasyarat sistem yang tinggi dan mahal. Sehingga penguna komputer bisa berfikir kembali untuk segera melakukan pengamanan data. Kata kunci: Keamanan jaringan, Keamanan data, IPSec.


Author(s):  
Dinesh Kumar ◽  
Dr. Smys S.

The most vital chores of the health care is the proper attention and sharing of the information’s about the patients record maintained whenever it is needed. The failure in proper maintenance of the patient’s particulars and proper sharing of information’s when required would lead to loss of privacy and reliability resulting in the inert and severe effects on the particulars of the patients as well as their lives respectively. So securing of the health care particulars in electronic form becomes a very important necessity nowadays. The constant monitoring of the centralized storage of health records that are prone to security threats are very difficult. So the paper puts forward a block chain technology to safeguard the reliability of the information’s stored and utilizes the digital signature with authentication to protect the private information’s in the patient’s record developing a model utilizing the cloud that enables the authenticity and the reliability of the information. The model put forth in the paper was examined and compared with the traditional techniques used for storing the medical records, on the terms of reply time, along with the cost of storing and retrieving.


Symmetry ◽  
2019 ◽  
Vol 11 (2) ◽  
pp. 272
Author(s):  
Xiuhua Lu ◽  
Qiaoyan Wen ◽  
Wei Yin ◽  
Kaitai Liang ◽  
Zhengping Jin ◽  
...  

Digital signature with proxy delegation, which is a secure ownership enforcement tool, allows an original signer to delegate signature rights to a third party called proxy, so that the proxy can sign messages on behalf of the original signer. Many real-world applications make use of this secure mechanism, e.g., digital property transfer. A traditional digital signature mechanism is required to bind a message and its signature together for verification. This may yield extra cost in bandwidth while the sizes of message and signature are relatively huge. Message recovery signature, enabling to reduce the cost of bandwidth, embeds a message into the corresponding signature; therefore, only the signature will be transmitted to the verifier and the message can further be recovered from the signature. In this paper, we, for the first time, propose a novel digital signature scheme in the identity-based context with proxy delegation and message recovery features and, more importantly, our scheme is quantum resistant, in a particular lattice-based signature. Our scheme achieves delegation information and signature existential unforgeability against adaptive chosen warrant and identity. Compared with the seminal lattice-based message recovery signature, our scheme is independent from public key infrastructure, realizes delegation transfer of signature rights, and compresses signature length ulteriorly. To the best of our knowledge, this paper is the first of its type.


Author(s):  
James F. Mancuso

IBM PC compatible computers are widely used in microscopy for applications ranging from control to image acquisition and analysis. The choice of IBM-PC based systems over competing computer platforms can be based on technical merit alone or on a number of factors relating to economics, availability of peripherals, management dictum, or simple personal preference.IBM-PC got a strong “head start” by first dominating clerical, document processing and financial applications. The use of these computers spilled into the laboratory where the DOS based IBM-PC replaced mini-computers. Compared to minicomputer, the PC provided a more for cost-effective platform for applications in numerical analysis, engineering and design, instrument control, image acquisition and image processing. In addition, the sitewide use of a common PC platform could reduce the cost of training and support services relative to cases where many different computer platforms were used. This could be especially true for the microscopists who must use computers in both the laboratory and the office.


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