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k-root-n: An efficient O(√n) algorithm for avoiding short term double spending in Distributed Ledger Technologies such as Blockchain
Blockchain bitcoin distributed ledger technology
2019/7/17
Blockchains such as bitcoin rely on reaching global consensus for the distributed ledger, and suffer from a well know scalability problem. We propose an algorithm which can avoid double spending in th...
Turbospeedz: Double Your Online SPDZ! Improving SPDZ using Function Dependent Preprocessing
Secure Multiparty Computation SPDZ concrete efficiency
2019/1/29
Secure multiparty computation allows a set of mutually distrusting parties to securely compute a function of their private inputs, revealing only the output, even if some of the parties are corrupt. R...
Double-block Hash-then-Sum: A Paradigm for Constructing BBB Secure PRF
DbHtS Beyond Birthday Cover-free
2018/11/20
SUM-ECBC (Yasuda, CT-RSA 2010) is the first beyond birthday bound (BBB) secure block cipher based deterministic MAC. After this work, some more BBB secure deterministic MACs have been proposed, namely...
Understanding and Constructing AKE via Double-key Key Encapsulation Mechanism
Authenticated Key Exchange CK Model Key Encapsulation Mechanism
2018/11/19
Motivated by abstracting the common idea behind several implicitly authenticated key exchange (AKE) protocols, we introduce a primitive that we call double-key key encapsulation mechanism (2-key KEM)....
The Double Ratchet: Security Notions, Proofs, and Modularization for the Signal Protocol
Signal protocol double ratcheting secure messaging
2018/11/2
Signal is a famous secure messaging protocol used by billions of people, by virtue of many secure text messaging applications including Signal itself, WhatsApp, Facebook Messenger, Skype, and Google A...
Generic Double-Authentication Preventing Signatures and a Post-Quantum Instantiation
digital signatures double-authentication prevention Shamir secret sharing
2018/9/6
Double-authentication preventing signatures (DAPS) are a variant of digital signatures which have received considerable attention recently (Derler et al. EuroS&P 2018, Poettering AfricaCrypt 2018). Th...
BeeHive: Double Non-interactive Secure Multi-party Computation
Secure multi-party computation secret sharing non-interactive
2018/8/16
Currently, round complexity and communication complexity are two fundamental issues of secure multi-party computation (MPC) since all known schemes require communication for each multiplication operat...
Shorter double-authentication preventing signatures for small address spaces
signature schemes self-enforcement
2018/3/5
A recent paper by Derler, Ramacher, and Slamanig (IEEE EuroS&P 2018) constructs double-authentication preventing signatures ("DAP signatures", a specific self-enforcement enabled variant of signatures...
Short Double- and N-Times-Authentication-Preventing Signatures from ECDSA and More
signatures ECDSA Schnorr
2017/12/19
Double-authentication-preventing signatures (DAPS) are signatures designed with the aim that signing two messages with an identical first part (called address) but different second parts (called paylo...
Double-spending Prevention for Bitcoin zero-confirmation transactions
Bitcoin double-spending
2017/5/11
Zero-confirmation transactions, i.e., transactions that have been broadcast but are still pending to be included in the blockchain, have gained attention in order to enable fast payments in Bitcoin, s...
Double DIP: Re-Evaluating Security of Logic Encryption Algorithms
logic encryption circuit obfuscation
2017/4/5
Logic encryption is a hardware security technique that uses extra key inputs to lock a given combinational circuit. A recent study by Subramanyan et al. shows that all existing logic encryption techni...
The Multi-User Security of Double Encryption
symmetric security provable security multi-user security
2017/2/21
It is widely known that double encryption does not substantially increase the security of a block cipher. Indeed, the classical meet-in-the middle attack recovers the 2k2k-bit secret key at the cost o...
This paper reduces the number of field multiplications required for scalar multiplication on conservative elliptic curves. For an average 256-bit integer n, this paper's multiply-by-n algorithm takes ...
Deterring Certificate Subversion: Efficient Double-Authentication-Preventing Signatures
signatures subversion mass surveillance
2016/12/8
This paper presents highly efficient designs of double authentication preventing signatures (DAPS). In a DAPS, signing two messages with the same first part and differing second parts reveals the sign...
On the Enumeration of Double-Base Chains with Applications to Elliptic Curve Cryptography
Double-base number system elliptic curve cryptography
2016/1/9
The Double-Base Number System (DBNS) uses two bases, 2 and 3, in order to represent any integer n. A Double-Base Chain (DBC) is a special case of a DBNS expansion. DBCs have been introduced to speed u...