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Offline Witness Encryption [chapter]

Hamza Abusalah, Georg Fuchsbauer, Krzysztof Pietrzak
<span title="">2016</span> <i title="Springer International Publishing"> <a target="_blank" rel="noopener" href="https://fatcat.wiki/container/2w3awgokqne6te4nvlofavy5a4" style="color: black;">Lecture Notes in Computer Science</a> </i> &nbsp;
Witness encryption (WE) is an exciting new primitive introduced by Garg et al. (STOC 2013).  ...  In this paper we construct a witness encryption scheme where encryption is a single Naor-Yung encryption (two CPA-encryptions and one NIZK proof showing the ciphertexts encrypt the same message), so encryption  ...  Definition 6 (Offline functional witness encryption).  ... 
<span class="external-identifiers"> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.1007/978-3-319-39555-5_16">doi:10.1007/978-3-319-39555-5_16</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/aq4azu4yczbstjmsz7ppo6jbeq">fatcat:aq4azu4yczbstjmsz7ppo6jbeq</a> </span>
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A New Hybrid Online and Offline Multi-Factor Cross-Domain Authentication Method for IoT Applications in the Automotive Industry

Haqi Khalid, Shaiful Jahari Hashim, Sharifah Mumtazah Syed Ahmad, Fazirulhisyam Hashim, Muhammad Akmal Chaudhary
<span title="2021-11-08">2021</span> <i title="MDPI AG"> <a target="_blank" rel="noopener" href="https://fatcat.wiki/container/a2yvk5xhdnhpxjnk6yd33uudqq" style="color: black;">Energies</a> </i> &nbsp;
Furthermore, an offline authentication phase uses the OTP algorithm to authenticate registered users even if the connectivity services are unavailable.  ...  ., replay attacks, MiTM attacks, impersonation attacks, and offline guessing attacks). Adversaries could all use these attacks to disrupt networks posing a threat to the entire automotive industry.  ...  Furthermore, the declaration /\ witness(TGS,V,k_cs1,K_US') illustrates that V witnessed the K_US' generated by the TGS, where /\ witness(TGS,CS,k_cs2, K_US') declares that the CS witnessed the K_US' that  ... 
<span class="external-identifiers"> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.3390/en14217437">doi:10.3390/en14217437</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/o2dczjlag5bk5bgrismeg6zdy4">fatcat:o2dczjlag5bk5bgrismeg6zdy4</a> </span>
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Zero-Knowledge Proofs with Witness Elimination [chapter]

Aggelos Kiayias, Hong-Sheng Zhou
<span title="">2009</span> <i title="Springer Berlin Heidelberg"> <a target="_blank" rel="noopener" href="https://fatcat.wiki/container/2w3awgokqne6te4nvlofavy5a4" style="color: black;">Lecture Notes in Computer Science</a> </i> &nbsp;
A number of interesting issues arise in the design of such protocols that include whether a protocol transcript enables the verifier to test for witness after termination (something akin to an "offline  ...  a given statement and additionally the witness does not belong to a set of eliminated witnesses.  ...  Then we use two encryption schemes to encrypt P 's witness, i.e., a Paillier [29] encryption to encrypt m into E, and a linear ElGamal encryption to encrypt σ into U, V, W .  ... 
<span class="external-identifiers"> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.1007/978-3-642-00468-1_8">doi:10.1007/978-3-642-00468-1_8</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/rj7qsbugcrdotbqjn2j63q624a">fatcat:rj7qsbugcrdotbqjn2j63q624a</a> </span>
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Multi-Client Verifiable Computation with Stronger Security Guarantees [chapter]

S. Dov Gordon, Jonathan Katz, Feng-Hao Liu, Elaine Shi, Hong-Sheng Zhou
<span title="">2015</span> <i title="Springer Berlin Heidelberg"> <a target="_blank" rel="noopener" href="https://fatcat.wiki/container/2w3awgokqne6te4nvlofavy5a4" style="color: black;">Lecture Notes in Computer Science</a> </i> &nbsp;
(Eurocrypt 2014) provided an alternative solution relying on multi-input functional encryption. Here we conduct a systematic study of MVC, with the goal of satisfying stronger security requirements.  ...  A.3 Extractable Witness Encryption Definition A.5 (Witness encryption [19] ) A witness encryption scheme for language L ∈ N P with witness relation R L consists of polynomial-time algorithms WE.  ...  B.1 mABE Implies Extractable Witness Encryption In this section we show that mABE for general functions implies an extractable witness encryption for all NP relations in the following theorem.  ... 
<span class="external-identifiers"> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.1007/978-3-662-46497-7_6">doi:10.1007/978-3-662-46497-7_6</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/z23dup3urjh6jdia7lxdr4xxxa">fatcat:z23dup3urjh6jdia7lxdr4xxxa</a> </span>
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Applying Divertibility to Blind Ballot Copying in the Helios Internet Voting System [chapter]

Yvo Desmedt, Pyrros Chaidos
<span title="">2012</span> <i title="Springer Berlin Heidelberg"> <a target="_blank" rel="noopener" href="https://fatcat.wiki/container/2w3awgokqne6te4nvlofavy5a4" style="color: black;">Lecture Notes in Computer Science</a> </i> &nbsp;
Niel Ferguson for suggesting the topic of encrypted copying during CRYPTO 2007. We also thank the referees for suggesting that code-voting prohibits blinded copying and for pointing out [7] .  ...  We will now show that such a voter can calculate a witness for the vote's validity (i.e. the encryption randomness used in encrypting the vote).: a i = g si /α c i and a i = g s i /α c i we have: g si  ...  An algorithm called a witness extractor can then output that witness if given oracle access to the prover.  ... 
<span class="external-identifiers"> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.1007/978-3-642-33167-1_25">doi:10.1007/978-3-642-33167-1_25</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/kz4mt6d465bt5oswlktpjtzd7e">fatcat:kz4mt6d465bt5oswlktpjtzd7e</a> </span>
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PAST: Probabilistic Authentication of Sensor Timestamps

Ashish Gehani, Surendar Chandra
<span title="">2006</span> <i title="IEEE"> <a target="_blank" rel="noopener" href="https://fatcat.wiki/container/c2syobe3wnconhocjx2ad2tkka" style="color: black;">Proceedings of the Computer Security Applications Conference</a> </i> &nbsp;
This is because the signature is identitybased and the verification key evolution protocol introduced in Section 3.4 can operate offline. Witness Generation A sensor generates a stream of readings.  ...  This is then encrypted using a randomly generated encryption key k c and symmetric cipher S() to produce e i = S kc (t i ||r i ). k c is encrypted with the storage server's public key k s and an asymmetric  ... 
<span class="external-identifiers"> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.1109/acsac.2006.37">doi:10.1109/acsac.2006.37</a> <a target="_blank" rel="external noopener" href="https://dblp.org/rec/conf/acsac/GehaniC06.html">dblp:conf/acsac/GehaniC06</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/udqqwb3wfrfuvhdrcz42qrstgq">fatcat:udqqwb3wfrfuvhdrcz42qrstgq</a> </span>
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Efficient Verifiable Ring Encryption for Ad Hoc Groups [chapter]

Joseph K. Liu, Patrick P. Tsang, Duncan S. Wong
<span title="">2005</span> <i title="Springer Berlin Heidelberg"> <a target="_blank" rel="noopener" href="https://fatcat.wiki/container/2w3awgokqne6te4nvlofavy5a4" style="color: black;">Lecture Notes in Computer Science</a> </i> &nbsp;
We propose an efficient Verifiable Ring Encryption (VRE) for ad hoc groups.  ...  VRE is a kind of verifiable encryption [16, 1, 4, 2, 8] in which it can be publicly verified that there exists at least one user, out of a designated group of n users, who can decrypt the encrypted message  ...  For δ ∈ ∆, an element w ∈ W such that (w, δ) ∈ R is called a witness for δ. The encryptor will be given a value δ, a witness w for δ, then encrypts w to generate a ciphertext ψ.  ... 
<span class="external-identifiers"> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.1007/11601494_1">doi:10.1007/11601494_1</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/3tgqueaarvfzhajep76dulrymi">fatcat:3tgqueaarvfzhajep76dulrymi</a> </span>
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Practical witness encryption for algebraic languages or how to encrypt under Groth–Sahai proofs

David Derler, Daniel Slamanig
<span title="2018-02-02">2018</span> <i title="Springer Nature"> <a target="_blank" rel="noopener" href="https://fatcat.wiki/container/c45m6ttnaje4xbjsq7m2c6df2a" style="color: black;">Designs, Codes and Cryptography</a> </i> &nbsp;
Witness encryption (WE) is a recent powerful encryption paradigm, which allows to encrypt a message using the description of a hard problem (a word in an NP-language) and someone who knows a solution to  ...  this problem (a witness) is able to efficiently decrypt the ciphertext.  ...  Introduction Witness encryption (WE) is a recent powerful encryption paradigm introduced by Garg et al. [GGSW13] .  ... 
<span class="external-identifiers"> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.1007/s10623-018-0460-y">doi:10.1007/s10623-018-0460-y</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/n3y5v4fp2zar5borrusrju76xy">fatcat:n3y5v4fp2zar5borrusrju76xy</a> </span>
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Plaintext-Verifiably-Checkable Encryption and its Extension in Dual-Server Setting

Yijian Zhong, Sha Ma, Qiong Huang
<span title="">2020</span> <i title="Institute of Electrical and Electronics Engineers (IEEE)"> <a target="_blank" rel="noopener" href="https://fatcat.wiki/container/q7qi7j4ckfac7ehf3mjbso4hne" style="color: black;">IEEE Access</a> </i> &nbsp;
Furthermore, we extend the work in dual-server setting, called dual-server plaintext-verifiablycheckable encryption (DS-PVCE), to resist offline message recover attack.  ...  INDEX TERMS Plaintext-checkable encryption, verifiability, pairing-friendly smooth projective hash function, dual-server, offline message recover attack, k-MDDH assumption. .  ...  CONCLUSION We proposed the notion of plaintext-verifiably-checkable encryption (PVCE), which could verify all valid ciphertexts to prevent malicious adversaries with unlink-cca security.  ... 
<span class="external-identifiers"> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.1109/access.2020.3007349">doi:10.1109/access.2020.3007349</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/ouo4tz7uwzbahnezy74dsjouwe">fatcat:ouo4tz7uwzbahnezy74dsjouwe</a> </span>
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A Hybrid Scheme for Fine-Grained Search and Access Authorization in Fog Computing Environment

Min Xiao, Jing Zhou, Xuejiao Liu, Mingda Jiang
<span title="2017-06-17">2017</span> <i title="MDPI AG"> <a target="_blank" rel="noopener" href="https://fatcat.wiki/container/taedaf6aozg7vitz5dpgkojane" style="color: black;">Sensors</a> </i> &nbsp;
In the fog computing environment, the encrypted sensitive data may be transferred to multiple fog nodes on the edge of a network for low latency; thus, fog nodes need to implement a search over encrypted  ...  Compared to existing schemes only supporting either index encryption with search ability or data encryption with fine-grained access control ability, the proposed hybrid scheme supports both abilities  ...  Considering the resource limitation of end IoT devices, our scheme exploits the online/offline ABE technique in [23] to split the encryption computation tasks into two steps, namely offline computation  ... 
<span class="external-identifiers"> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.3390/s17061423">doi:10.3390/s17061423</a> <a target="_blank" rel="external noopener" href="https://www.ncbi.nlm.nih.gov/pubmed/28629131">pmid:28629131</a> <a target="_blank" rel="external noopener" href="https://pubmed.ncbi.nlm.nih.gov/PMC5492313/">pmcid:PMC5492313</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/jxct7d77qrby5k3ziqxe2rbf2m">fatcat:jxct7d77qrby5k3ziqxe2rbf2m</a> </span>
<a target="_blank" rel="noopener" href="https://web.archive.org/web/20180730022701/https://res.mdpi.com/def502001b65c6d080e8f1a03a105f66a705a98ca2c01b82ce726b18753cfdfb74026680293a1d796b44b584f1fed8e05802c02445b3bf62c25fe2288d56cf27af40042c7dc5456fb5056cd83571305d4612ca4650412180113162bec127e13a730ccf4cf17d28cd3ae4d655bb861f0b08eecdcb01cd40bf63b1754aa6fcfcca3eb69aa8dca6df1e35c4959dc4262e5e0d2f54?filename=&amp;attachment=1" title="fulltext PDF download" data-goatcounter-click="serp-fulltext" data-goatcounter-title="serp-fulltext"> <button class="ui simple right pointing dropdown compact black labeled icon button serp-button"> <i class="icon ia-icon"></i> Web Archive [PDF] <div class="menu fulltext-thumbnail"> <img src="https://blobs.fatcat.wiki/thumbnail/pdf/01/46/01463caa3604e1891206b6734b46eb3bcf089321.180px.jpg" alt="fulltext thumbnail" loading="lazy"> </div> </button> </a> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.3390/s17061423"> <button class="ui left aligned compact blue labeled icon button serp-button"> <i class="unlock alternate icon" style="background-color: #fb971f;"></i> mdpi.com </button> </a> <a target="_blank" rel="external noopener" href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5492313" title="pubmed link"> <button class="ui compact blue labeled icon button serp-button"> <i class="file alternate outline icon"></i> pubmed.gov </button> </a>

Secure Decision Forest Evaluation [article]

Slim Bettaieb, Loic Bidoux, Olivier Blazy
<span title="2021-08-19">2021</span> <i > arXiv </i> &nbsp; <span class="release-stage" >pre-print</span>
In this paper, we propose a new offline/online protocol between a client and a server with a constant number of rounds in the online phase, with both privacy and soundness against malicious clients.  ...  For our scheme, the server's privacy is provided by the encryption of the model in C, during the offline phase.  ...  Offline Storage Cost. During the offline phase, the server sends C to the client which requires to store 2 ν · δ · P · λ AHE bits.  ... 
<span class="external-identifiers"> <a target="_blank" rel="external noopener" href="https://arxiv.org/abs/2108.08546v1">arXiv:2108.08546v1</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/be2gvunx6vbxxol27e74f33ivy">fatcat:be2gvunx6vbxxol27e74f33ivy</a> </span>
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Practical Design And Implementation Of A Mobile Off-Line E-Wallet

Mbouassa Edmond Yannick, Hu Dong Hui
<span title="2019-05-31">2019</span> <i title="Zenodo"> Zenodo </i> &nbsp;
Here we present a mobile offline payment mobile application that can allow a user to make a payment without internet connection.  ...  During the last ten years, we have witnessed what we can call an economical revolution, with the arrival of Ecommerce, the electronic money and many online payment tools.  ...  Let's M be the message to be encrypted, IV be the initialization vector for the encryption, n the nonce value, q the private key , d the public key, E the encrypted message and D the decrypted message.  ... 
<span class="external-identifiers"> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.5281/zenodo.3252959">doi:10.5281/zenodo.3252959</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/iwu3rq5tdbbhxlem6jq6wh3twy">fatcat:iwu3rq5tdbbhxlem6jq6wh3twy</a> </span>
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Mitigating Server Breaches in Password-Based Authentication: Secure and Efficient Solutions [chapter]

Olivier Blazy, Céline Chevalier, Damien Vergnaud
<span title="">2016</span> <i title="Springer International Publishing"> <a target="_blank" rel="noopener" href="https://fatcat.wiki/container/2w3awgokqne6te4nvlofavy5a4" style="color: black;">Lecture Notes in Computer Science</a> </i> &nbsp;
its private witness r.  ...  Since the decryption key is the witness of the SPHF, without knowing the witness, the two distributions remain indistinguishable. Main Idea of the Construction.  ... 
<span class="external-identifiers"> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.1007/978-3-319-29485-8_1">doi:10.1007/978-3-319-29485-8_1</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/gstbmlp7onfyfdlvmp3uwrkgxq">fatcat:gstbmlp7onfyfdlvmp3uwrkgxq</a> </span>
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Encoding Functions with Constant Online Rate, or How to Compress Garbled Circuit Keys

Benny Applebaum, Yuval Ishai, Eyal Kushilevitz, Brent Waters
<span title="">2015</span> <i title="Society for Industrial &amp; Applied Mathematics (SIAM)"> <a target="_blank" rel="noopener" href="https://fatcat.wiki/container/7dys7zoberdktmxyjciuy5bnse" style="color: black;">SIAM journal on computing (Print)</a> </i> &nbsp;
More concretely, the online part x consists of an n-bit string and a single encryption key.  ...  Yao's garbled circuit construction gives rise to such randomized encodings in which the online partx consists of n encryption keys of length κ each, where n = |x| and κ is a security parameter.  ...  An online message that depends on the public input x and the private witness w.  ... 
<span class="external-identifiers"> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.1137/130929643">doi:10.1137/130929643</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/pwv2vdym4jeptaawxgca2pygxe">fatcat:pwv2vdym4jeptaawxgca2pygxe</a> </span>
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Two Secure Anonymous Proxy-based Data Storages

Olivier Blazy, Xavier Bultel, Pascal Lafourcade
<span title="">2016</span> <i title="SCITEPRESS - Science and Technology Publications"> <a target="_blank" rel="noopener" href="https://fatcat.wiki/container/tucwymxjpnhgdnuki4g66gio5q" style="color: black;">Proceedings of the 13th International Joint Conference on e-Business and Telecommunications</a> </i> &nbsp;
Unidirectional proxy re-encryption (PRE) can be used to realize an efficient and secure shared storage.  ...  We propose two secure data storage systems that allow authorized users to anonymously get access to the content of encrypted data on a storage. Each scheme corresponds to a certain economic model.  ...  • Correctness: Let W ∈ L and w a witness of this membership.  ... 
<span class="external-identifiers"> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.5220/0005962402510258">doi:10.5220/0005962402510258</a> <a target="_blank" rel="external noopener" href="https://dblp.org/rec/conf/secrypt/BlazyB016.html">dblp:conf/secrypt/BlazyB016</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/x5uqktnfojhirpulahlhrlq4iq">fatcat:x5uqktnfojhirpulahlhrlq4iq</a> </span>
<a target="_blank" rel="noopener" href="https://web.archive.org/web/20180719004727/https://hal.archives-ouvertes.fr/hal-01382950/file/Secrypt16-BBL.pdf" title="fulltext PDF download" data-goatcounter-click="serp-fulltext" data-goatcounter-title="serp-fulltext"> <button class="ui simple right pointing dropdown compact black labeled icon button serp-button"> <i class="icon ia-icon"></i> Web Archive [PDF] <div class="menu fulltext-thumbnail"> <img src="https://blobs.fatcat.wiki/thumbnail/pdf/e0/b4/e0b48c8f6388b6a52e9d4dc1bef6e3f2b55dd832.180px.jpg" alt="fulltext thumbnail" loading="lazy"> </div> </button> </a> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.5220/0005962402510258"> <button class="ui left aligned compact blue labeled icon button serp-button"> <i class="external alternate icon"></i> Publisher / doi.org </button> </a>
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