scholarly journals On Randomizing Hash Functions to Strengthen the Security of Digital Signatures

2009 ◽  
pp. 88-105 ◽  
Author(s):  
Praveen Gauravaram ◽  
Lars R. Knudsen
Keyword(s):  
Hash Functions ◽  
Digital Signatures

Hash Functions and Their Applications

2018 ◽  
pp. 66-77
Author(s):  
Kannan Balasubramanian
Keyword(s):  
Hash Function ◽  
Hash Functions ◽  
Digital Signatures ◽  
Message Authentication ◽  
Authenticated Encryption ◽  
Authentication Codes ◽  
Message Authentication Codes ◽  
Message Digest ◽  
Cryptographic Hash Functions

Cryptographic Hash Functions are used to achieve a number of Security goals like Message Authentication, Message Integrity, and are also used to implement Digital Signatures (Non-repudiation), and Entity Authentication. This chapter discusses the construction of hash functions and the various attacks on the Hash functions. The Message Authentication Codes are similar to the Hash functions except that they require a key for producing the message digest or hash. Authenticated Encryption is a scheme that combines hashing and Encryption. The Various types of hash functions like one-way hash function, Collision Resistant hash function and Universal hash functions are also discussed in this chapter.

Digital Signatures Out of Second-Preimage Resistant Hash Functions

2008 ◽  
pp. 109-123 ◽  
Author(s):  
Erik Dahmen ◽  
Katsuyuki Okeya ◽  
Tsuyoshi Takagi ◽  
Camille Vuillaume
Keyword(s):  
Hash Functions ◽  
Digital Signatures

REALIZING DIGITAL SIGNATURES WITH ONE-WAY HASH FUNCTIONS

Cryptologia ◽  
1993 ◽  
Vol 17 (3) ◽  
pp. 285-300
Author(s):  
Christoph Ruland
Keyword(s):  
Hash Functions ◽  
Digital Signatures

scholarly journals Analysis of the Cryptographic Tools for Blockchain and Bitcoin

Mathematics ◽  
2020 ◽  
Vol 8 (1) ◽  
pp. 131 ◽  
Author(s):  
Víctor Gayoso Martínez ◽  
Luis Hernández-Álvarez ◽  
Luis Hernández Encinas
Keyword(s):  
Elliptic Curves ◽  
Emerging Technologies ◽  
Hash Functions ◽  
Digital Signatures ◽  
Building Blocks ◽  
Smart Contracts ◽  
Merkle Trees

Blockchain is one of the most interesting emerging technologies nowadays, with applications ranging from cryptocurrencies to smart contracts. This paper presents a review of the cryptographic tools necessary to understand the fundamentals of this technology and the foundations of its security. Among other elements, hash functions, digital signatures, elliptic curves, and Merkle trees are reviewed in the scope of their usage as building blocks of this technology.

Integrity and Authentication

2008 ◽  
pp. 122-151
Author(s):  
Manuel Mogollon
Keyword(s):  
Hash Functions ◽  
Digital Signatures ◽  
Message Authentication ◽  
Message Authentication Code ◽  
Authentication Code

In this chapter, methods that can check if a message was modified are explained; this includes the Message Authentication Code (MAC), hash functions, and the Keyed-Hash Message Authentication Code (HMAC). Also discussed are ways to verify a sender’s identity by using digital signatures.

scholarly journals SECURITY IN DECENTRALIZED DATABASES

2019 ◽  
Vol 1 (92) ◽  
pp. 59-64
Author(s):  
I.V. Kyrychenko ◽  
О. S. Nazarov ◽  
I. V. Gruzdo ◽  
N. Kozel
Keyword(s):  
Single Point ◽  
Hash Functions ◽  
Digital Signatures ◽  
Third Party ◽  
Distributed Network ◽  
Privacy And Security ◽  
Private Key ◽  
Blockchain Technology ◽  
Digital Certificates ◽  
Digital Transactions

Blockchain is a distributed network that records digital transactions on a publicly accessible ledger. This paper explores whether blockchain technology is a suitable platform for the preservation of digital signatures and public/ private key pairs. Conventional infrastructures use digital certificates, issued by certification authorities, to declare the authentication of key pairs and digital signatures. This paper suggests that the blockchain’s hash functions offer a better strategy for signature preservation than digital certificates. Compared to digital certificates, hashing provides better privacy and security. It is a form of authentication that does not require trust in a third-party authority, and the distributed nature of the blockchain network removes the problem of a single point of failure.

Bitcoin Under Broken Crypto Primitives

2020 ◽  
pp. 265-278
Author(s):  
Andreas Bolfing
Keyword(s):  
Quantum Algorithms ◽  
Hash Functions ◽  
Digital Signatures ◽  
Cryptographic Primitives ◽  
Computing Power ◽  
General Overview ◽  
Software Implementations ◽  
Merkle Trees

Bitcoin’s security relies solely on cryptographic primitives, namely on digital signatures, hash functions and Merkle trees. This chapter discusses the security of the Bitcoin system if some primitives become weaker due to advances in cryptanalysis, an increasing computing power of the adversaries or improper software implementations. The chapter starts with a general overview of the primitives in use, explaining possible attack strategies against each of them, which is followed by combined attack strategies. The chapter closes by showing the consequences of Grover’s and Shor’s quantum algorithms for Bitcoin’s security.

Schemes for Digital Signatures

2012 ◽  
pp. 20-25
Keyword(s):  
Hash Functions ◽  
Digital Signatures ◽  
The Other ◽  
Bulletin Board ◽  
Message Authentication ◽  
Authentication Codes ◽  
The Public ◽  
Message Authentication Codes ◽  
Other Hand

Integrity is the property of information concerning protection against its unauthorized modifications and forgeries. This chapter discusses bulletin board (BB), hash functions, MACs (Message Authentication Codes) and digital signatures, as schemes for maintaining integrity of data. BBs protect data by simply disclosing them to the public, i.e. an entity cannot modify them without being watched by others. Hash functions, Macs, and digital signatures protect data by detecting illegitimate modifications while attaching values to the data. Namely, when an entity illegitimately modifies the data, the modified results become inconsistent with the attached values. When hash functions, MACs and digital signatures are compared regarding the ability to convince entities that the data are authorized ones, hash functions cannot enable entities to convince others, and by MACs, entities can convince others only when relevant secrets are properly protected. On the other hand, digital signatures enable anyone to convince others without constraints.

Sign in / Sign up

Export Citation Format

Share Document