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A Framework for Universally Composable Oblivious Transfer from One-Round Key-Exchange
Oblivious transfer universal composability key exchange
2019/6/21
Oblivious transfer is one of the main pillars of modern cryptography and plays a major role as a building block for other more complex cryptographic primitives. In this work, we present an efficient a...
Oblivious Transfer has played a crucial role in the design of secure multi party computation. Nevertheless, there are not many practical solutions that achieve simulation based security and at the sam...
Post-Quantum UC-Secure Oblivious Transfer in the Standard Model with Adaptive Corruptions
Smooth Projective Hash Functions Oblivious Transfer
2019/6/19
Since the seminal result of Kilian, Oblivious Transfer has proven to be a fundamental primitive in cryptography. In such a scheme, a user is able to gain access to an element owned by a server, withou...
We show a new general approach for constructing maliciously secure two-round oblivious transfer (OT). Specifically, we provide a generic sequence of transformations to upgrade a very basic notion of t...
Analysis Of The Simulatability Of An Oblivious Transfer
oblivious transfer secure multiparty computation malicious adversaries
2018/12/3
In the Journal of Cryptology (25(1): 158-193. 2012), Shai Halevi and Yael Kalai proposed a general framework for constructing two-message oblivious transfer protocols using smooth projective hashing. ...
Universally Composable Oblivious Transfer Protocol based on the RLWE Assumption
cryptographic protocols oblivious transfer
2018/12/3
We use an RLWE-based key exchange scheme to construct a simple and efficient post-quantum oblivious transfer based on the Ring Learning with Errors assumption. We prove that our protocol is secure in ...
Oblivious Transfer in Incomplete Networks
Oblivious transfer information theory incomplete networks
2018/11/13
Secure message transmission and Byzantine agreement have been studied extensively in incomplete networks. However, information theoretically secure multiparty computation (MPC) in incomplete networks ...
Simple oblivious transfer protocols compatible with Kummer and supersingular isogenies
Oblivious transfer Diffie-Hellman key exchange supersingular isogeny
2018/8/2
The key exchange protocol of Diffie and Hellman, which can be defined for any group, has the special feature of using only exponentiations. In particular, it can also be instantiated in Kummer varieti...
Secure Oblivious Transfer from Semi-Commutative Masking
oblivious transfer UC security group action
2018/7/9
In this work we first define semi-commutative (invertible) masking structures which present a simple abstraction to capture the various examples of protocol design that are based on exponentiation-onl...
Oblivious transfer is an important tool against malicious cloud server providers. Halevi-Kalai OT, which is based on smooth projective hash(SPH), is a famous and the most efficient framework for 11-ou...
We give a construction of an adaptive garbled RAM scheme. In the adaptive setting, a client first garbles a ``large'' persistent database which is stored on a server. Next, the client can provide mult...
Supersingular Isogeny Oblivious Transfer
supersingular elliptic curves isogenies supersingular isogeny Diffie-Hellman
2018/5/22
We present an oblivious transfer (OT) protocol that combines the OT scheme of Chou and Orlandi together with the supersingular isogeny Diffie-Hellman (SIDH) primitive of De Feo, Jao, and Plût. Ou...
Extending Oblivious Transfer with Low Communication via Key-Homomorphic PRFs
oblivious transfer learning with errors multi-party computation
2018/1/11
We present a new approach to extending oblivious transfer with communication complexity that is logarithmic in the security parameter. Our method only makes black-box use of the underlying cryptograph...
Efficient, Round-optimal, Universally-Composable Oblivious Transfer and Commitment Scheme with Adaptive Security
Oblivious Transfer Commitment Schemes Universal Composability
2017/12/1
Adaptive security embodies one of the strongest notions of security that allows an adversary to corrupt parties at any point during protocol execution and gain access to its internal state. Since it m...
Efficient and Universally Composable Protocols for Oblivious Transfer from the CDH Assumption
Oblivious Transfer Universally Composable Security
2017/10/16
Oblivious Transfer (OT) is a simple, yet fundamental primitive which suffices to achieve almost every cryptographic application. In a recent work (Latincrypt `15), Chou and Orlandi (CO) present the mo...