Private-key algebraic-code encryptions

This work formalizes Publicly Auditable Conditional Blind Signatures (PACBS), a new cryptographic primitive that allows the verifiable issuance of blind signatures, the validity of which is contingent upon a predicate and decided by a designated verifier. In particular, when a user requests the signing of a message, blinded to protect her privacy, the signer embeds data in the signature that makes it valid if and only if a condition holds. A verifier, identified by a private key, can check the signature and learn the value of the predicate. Auditability mechanisms in the form of non-interactive zero-knowledge proofs are provided, so that a cheating signer cannot issue arbitrary signatures and a cheating verifier cannot ignore the embedded condition. The security properties of this new primitive are defined using cryptographic games. A proof-of-concept construction, based on the Okamoto–Schnorr blind signatures infused with a plaintext equivalence test is presented and its security is analyzed.

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A Consortium Blockchain Wallet Scheme Based on Dual-Threshold Key Sharing

Symmetry ◽

10.3390/sym13081444 ◽

2021 ◽

Vol 13 (8) ◽

pp. 1444

Author(s):

Guojia Li ◽

Lin You

Keyword(s):

Secret Sharing ◽

Important Data ◽

Private Key ◽

Digital Assets

In recent years, blockchain has triggered an upsurge in the application of decentralized models and has received more and more attention. For convenience and security considerations, in blockchain applications, users usually use wallets to manage digital assets. The most important data stored in the wallet is the user’s private key, which is also the only identification of the ownership of the encrypted digital assets. Once the private key is lost or stolen, it will bring irreparable losses. We proposed a consortium blockchain wallet scheme based on dual-threshold key protection secret-sharing. By splitting and storing the user’s wallet private key using a secret-sharing method, we can protect our private keys safely and effectively. Our scheme is based on the application scenario of the consortium blockchain. The peers preset by the consortium blockchain store the user’s wallet private key shadow shares, reasonably integrate storage resources, and enhance the solution’s anti-attack ability by setting double thresholds.

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Nonsingular matrix as private key on ElGamal cryptosystem

Journal of Physics Conference Series ◽

10.1088/1742-6596/1821/1/012018 ◽

2021 ◽

Vol 1821 (1) ◽

pp. 012018

Author(s):

Maxrizal ◽

Syafrul Irawadi

Keyword(s):

Nonsingular Matrix ◽

Private Key ◽

Elgamal Cryptosystem

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A Hierarchical Key Management Scheme in Mobile Ad hoc Networks

Advanced Engineering Forum ◽

10.4028/www.scientific.net/aef.1.295 ◽

2011 ◽

Vol 1 ◽

pp. 295-299

Author(s):

Jun Wu ◽

Run Hua Shi ◽

Hong Zhong

Keyword(s):

Ad Hoc Networks ◽

Mobile Ad Hoc Networks ◽

Secret Sharing ◽

Key Management ◽

Ad Hoc ◽

Private Key ◽

Management Scheme ◽

Mobile Ad Hoc ◽

Hoc Networks ◽

Key Management Scheme

This paper proposes a hierarchical key management scheme in the mobile Ad hoc networks. In this scheme, there are two kinds of server nodes: the special server nodes and the ordinary server nodes, such that only when two kinds of server nodes collaborate can they provide a certificate service. In order to satisfy this special application, we design a new secret sharing scheme for splitting the system private key, in which it generates two different kinds of shares of the system private key: the special share and the ordinary share, where it needs at least one special share and t ordinary shares to recover the system private key, thus we call it threshold scheme. Furthermore, we present a distributed signature scheme for a user’s certificate in the mobile Ad hoc networks based on this secret sharing.

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