Knowledge Base
Browse the concepts behind Truestamp. Follow the links between concepts, or search across everything.
Tagged: digital-signatures
20
Library
A Hybrid Approach to the Problems of Time-Stamping
UPB Scientific Bulletin paper surveying simple, linking, and distributed time-stamping schemes, their back-dating and verification weaknesses, and a hybrid multi-authority design using control time-stamps.
Bitcoin: A Peer-to-Peer Electronic Cash System
Satoshi Nakamoto's 2008 Bitcoin whitepaper: a trustless peer-to-peer cash system using a proof-of-work timestamp server, hash-chained blocks, and Merkle trees to prevent double-spending.
Blockchain vs Traditional Timestamping Methods (ScoreDetect Blog)
ScoreDetect blog article contrasting blockchain timestamping with traditional TSA/RFC 3161 timestamping across security, speed, scalability, cost, immutability, transparency, Merkle-tree batching, hybrid systems, and legal admissibility.
Cryptographic Accelerators for Digital Signature Based on Ed25519
IEEE TVLSI 2021 paper by Bisheh-Niasar, Azarderakhsh, and Mozaffari-Kermani presenting two FPGA hardware accelerators for the Ed25519 (EdDSA) digital signature, with Karatsuba multiplication and side-channel countermeasures.
Difference between X25519 and Ed25519 - Cryptography Stack Exchange
Stack Exchange Q&A explaining how X25519 (ECDH key exchange) and Ed25519 (EdDSA signatures) both build on Curve25519 using different curve forms and coordinate representations.
Ed25519 Deep Dive Addendum (r/crypto)
r/crypto discussion of Cendyne's Ed25519 Deep Dive Addendum, covering inconsistent signature-validation criteria across libraries, strong unforgeability, cofactored verification, non-canonical encodings, and the design history of EdDSA.
Ed25519: high-speed high-security signatures
The official Ed25519 site by Bernstein, Duif, Lange, Schwabe, and Yang: an EdDSA elliptic-curve signature scheme over edwards25519 with 128-bit security, deterministic nonces, 32-byte keys, and 64-byte signatures.
EdDSA (Wikipedia)
Wikipedia's overview of the Edwards-curve Digital Signature Algorithm: twisted Edwards curves, Schnorr variant, deterministic nonces, Ed25519 and Ed448, key and signature sizes, and standardization.
How to Time-Stamp a Digital Document
Haber and Stornetta's 1991 Journal of Cryptology paper founding cryptographic digital timestamping via hashing, digital signatures, hash-linking chains, and distributed-trust witnessing.
Improving the Efficiency and Reliability of Digital Time-Stamping
Bayer, Haber, and Stornetta 1993 paper introducing hash trees (Merkle trees) to batch digital time-stamp requests, reducing storage and verification cost and enabling time-stamp renewal to extend signature lifetimes.
Proving the Integrity of Digital Evidence with Time
Chet Hosmer's 2002 IJDE article arguing that trusted, auditable, UTC-traceable timestamps must bind who, what, and when to preserve the integrity of digital evidence for forensic and legal use.
Ralph Merkle - Wikipedia
Wikipedia biography of Ralph Merkle, co-inventor of public-key cryptography, inventor of Merkle trees and cryptographic hashing, and researcher in nanotechnology and cryonics.
RFC 8032: Edwards-Curve Digital Signature Algorithm (EdDSA)
IRTF/CFRG specification of EdDSA deterministic Schnorr signatures over twisted Edwards curves, defining Ed25519 (SHA-512) and Ed448 (SHAKE256), with encoding, verification, and test vectors.
RFC 8785: JSON Canonicalization Scheme (JCS)
RFC 8785 defines the JSON Canonicalization Scheme (JCS), a deterministic serialization of I-JSON data for reliable hashing and signing, using ECMAScript number formatting, UTF-16 property sorting, and UTF-8 output.
ssh-keygen: Wikipedia
Wikipedia overview of ssh-keygen, the OpenSSH command-line utility that generates, manages, and converts authentication keys, covering RSA, DSA, ECDSA, and Ed25519 key types.
Stuart Haber - Wikipedia
Wikipedia biography of cryptographer Stuart Haber, co-author of the 1991 linked digital time-stamping work with Scott Stornetta, cited in the Bitcoin whitepaper and foundational to blockchain.
The Inventor of Blockchain Would Like a Better Bitcoin
Blockworks interview with cryptographic-timestamping pioneer Scott Stornetta on Bitcoin's achievements and flaws: incomplete decentralization, mining incentives, lack of monetary privacy, and immutable record-keeping against AI deepfakes.
The Provable Security of Ed25519: Theory and Practice
Academic paper giving the first detailed security proofs for Ed25519 (EdDSA) signature variants, covering EUF-CMA, SUF-CMA, key substitution resistance, malleability, and small-subgroup element checks.
Things that use Ed25519 - IANIX
IANIX catalog tracking real-world deployment of the Ed25519 EdDSA signature scheme across protocols, operating systems, hardware security modules, and cryptographic libraries.
Why is implementation relevant to timing attacks?
Cryptography Stack Exchange Q&A on why constant-time implementation, not just algorithm choice, defends against timing and side-channel attacks, covering the realistic attack model and data-dependent operations.