Efficient Fair Multiparty Protocols Using Blockchain and Trusted Hardware

2019 ◽  
pp. 301-320
Author(s):  
Souradyuti Paul ◽  
Ananya Shrivastava
Keyword(s):  
Trusted Hardware ◽  
Multiparty Protocols

Implementing an untrusted operating system on trusted hardware

2003 ◽  
Vol 37 (5) ◽  
pp. 178-192 ◽  
Author(s):  
David Lie ◽  
Chandramohan A. Thekkath ◽  
Mark Horowitz
Keyword(s):  
Operating System ◽  
Trusted Hardware

Succinct Scriptable NIZK via Trusted Hardware

2021 ◽  
pp. 430-451
Author(s):  
Bingsheng Zhang ◽  
Yuan Chen ◽  
Jiaqi Li ◽  
Yajin Zhou ◽  
Phuc Thai ◽  
...  
Keyword(s):  
Trusted Hardware

scholarly journals Cryptography with Disposable Backdoors

Cryptography ◽  
2019 ◽  
Vol 3 (3) ◽  
pp. 22
Author(s):  
Kai-Min Chung ◽  
Marios Georgiou ◽  
Ching-Yi Lai ◽  
Vassilis Zikas
Keyword(s):  
Quantum Computation ◽  
Good Reason ◽  
Message Authentication ◽  
Public Key Encryption ◽  
Authentication Codes ◽  
Digital World ◽  
Trusted Hardware ◽  
Single Use ◽  
Generic Transformation ◽  
Provably Secure

Backdooring cryptographic algorithms is an indisputable taboo in the cryptographic literature for a good reason: however noble the intentions, backdoors might fall in the wrong hands, in which case security is completely compromised. Nonetheless, more and more legislative pressure is being produced to enforce the use of such backdoors. In this work we introduce the concept of disposable cryptographic backdoors which can be used only once and become useless after that. These exotic primitives are impossible in the classical digital world without stateful and secure trusted hardware support, but, as we show, are feasible assuming quantum computation and access to classical stateless hardware tokens. Concretely, we construct a disposable (single-use) version of message authentication codes, and use them to derive a black-box construction of stateful hardware tokens in the above setting with quantum computation and classical stateless hardware tokens. This can be viewed as a generic transformation from stateful to stateless tokens and enables, among other things, one-time programs and memories. This is to our knowledge the first provably secure construction of such primitives from stateless tokens. As an application of disposable cryptographic backdoors we use our constructed primitive above to propose a middle-ground solution to the recent legislative push to backdoor cryptography: the conflict between Apple and FBI. We show that it is possible for Apple to create a one-time backdoor which unlocks any single device, and not even Apple can use it to unlock more than one, i.e., the backdoor becomes useless after it is used. We further describe how to use our ideas to derive a version of CCA-secure public key encryption, which is accompanied with a disposable (i.e., single-use, as in the above scenario) backdoor.

scholarly journals Boolean Searchable Symmetric Encryption with Filters on Trusted Hardware

2020 ◽  
pp. 1-1
Author(s):  
Bernardo Ferreira ◽  
Bernardo Portela ◽  
Tiago Oliveira ◽  
Guilherme Borges ◽  
Henrique Joao Domingos ◽  
...  
Keyword(s):  
Symmetric Encryption ◽  
Searchable Symmetric Encryption ◽  
Trusted Hardware

scholarly journals Secure Multiparty Computation and Trusted Hardware: Examining Adoption Challenges and Opportunities

2019 ◽  
Vol 2019 ◽  
pp. 1-28 ◽  
Author(s):  
Joseph I. Choi ◽  
Kevin R. B. Butler
Keyword(s):  
Real Time ◽  
Privacy Preserving ◽  
Secure Multiparty Computation ◽  
Multiparty Computation ◽  
Garbled Circuits ◽  
Challenges And Opportunities ◽  
Trusted Hardware ◽  
History Of

When two or more parties need to compute a common result while safeguarding their sensitive inputs, they use secure multiparty computation (SMC) techniques such as garbled circuits. The traditional enabler of SMC is cryptography, but the significant number of cryptographic operations required results in these techniques being impractical for most real-time, online computations. Trusted execution environments (TEEs) provide hardware-enforced isolation of code and data in use, making them promising candidates for making SMC more tractable. This paper revisits the history of improvements to SMC over the years and considers the possibility of coupling trusted hardware with SMC. This paper also addresses three open challenges: (1) defeating malicious adversaries, (2) mobile-friendly TEE-supported SMC, and (3) a more general coupling of trusted hardware and privacy-preserving computation.

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