Enterprise Document Signing Platform

KeyGridTrustSign

Enterprise-grade document signing with quantum-safe cryptography and four flexible operating modes. Support for PAdES, CAdES, XAdES, and ASiC-E with 30+ year long-term validation. Work with your own CAs and TSAs, or use KeyGrid's integrated services. eIDAS, ESIGN, and ZertES compliant.

Flexible Architecture: Use your own certificate authorities and timestamp services, or leverage KeyGrid's integrated infrastructure

Enterprise Document Signing

Complete signing platform with quantum-safe protection, multi-format support, and operational flexibility

Four Operating Modes

Complete deployment flexibility from fully internal to fully external infrastructure

  • Internal CA + HSM + TSA
  • External certificates + internal TSA
  • External certificates + external TSA
  • Fully external BYOK mode

Post-Quantum Signatures

NIST-approved ML-DSA algorithms for quantum-resistant document protection

  • ML-DSA-44/65/87 (FIPS 204)
  • Hybrid classical + PQC signing
  • SLH-DSA stateless alternative
  • Future-proof signature security

Multi-Format Support

Standards-compliant signature formats for every document type

  • PAdES (PDF signatures)
  • CAdES (binary CMS signatures)
  • XAdES (XML signatures)
  • ASiC-E evidence containers

Three Signature Levels

Escalating protection from simple to qualified electronic signatures

  • Basic: ECDSA P-256
  • Advanced: ECDSA P-384 + timestamp
  • Maximum: Classical + PQC + LTV
  • eIDAS SES, AdES, and QES ready

Long-Term Validation

Automated archive timestamps ensure document validity for decades

  • 30+ year document validity
  • Automated re-timestamping
  • Embedded OCSP & CRL data
  • Configurable archival schedule

RFC 3161 Timestamping

Integrated Time Stamp Authority with internal or external qualified TSA support

  • Internal multi-tenant TSA
  • External qualified TSA support
  • Multiple time sources (NTP, GPS)
  • Policy-based timestamp issuance

HSM-Protected Keys

Signing keys never leave the hardware security module boundary

  • FIPS 140-2 Level 2/3
  • Azure Key Vault & CloudHSM
  • AWS KMS & CloudHSM
  • PKCS#11 interface support

Batch Signing Engine

High-throughput parallel processing for enterprise-scale document workflows

  • 10,000+ documents per hour
  • Asynchronous batch processing
  • Webhook event notifications
  • Per-document status tracking

Evidence Packages

Court-admissible audit trails packaged in standardized containers

  • ASiC-E evidence containers
  • Complete certificate chains
  • Verification reports (JSON + PDF)
  • Manifest with SHA-384 hashes
Maximum Flexibility

Your Infrastructure, Your Choice

Four operating modes let you work with existing qualified trust service providers and government certificate authorities while KeyGrid handles orchestration and format management

Mode 1

Internal Only

KeyGrid manages the entire signing infrastructure internally.

KeyGrid CA
Internal HSM
Internal TSA

Development, testing, and internal document workflows

Mode 2

External Certs + Internal TSA

Use government or QTSP-issued certificates with KeyGrid timestamping.

Government / QTSP CA
Internal HSM
Internal TSA

Regulated industries requiring specific certificate authorities

Mode 3

External Certs + External TSA

Government certificates paired with a qualified external timestamp authority.

Government / QTSP CA
Internal HSM
Qualified External TSA

Full regulatory compliance with qualified timestamps

Mode 4

Fully External (BYOK)

Bring your own keys, certificates, and timestamp services.

External CA
External HSM / PKCS#11
External TSA

Cross-border qualified electronic signatures (QES)

Standards-Compliant Signature Formats

Full support for all major electronic signature standards with baseline B through LTA

PAdES

PDF Advanced Electronic Signatures

Native PDF signature embedding with Document Security Store for long-term validation

Baseline B, T, LT, LTA

ISO 32000 / ETSI EN 319 142

CAdES

CMS Advanced Electronic Signatures

Binary document signing with CMS SignedData structures and detached signatures

Baseline B, T, LT, LTA

ETSI EN 319 122

XAdES

XML Advanced Electronic Signatures

XML document signing with qualifying properties and enveloped signatures

Baseline B, T, LT, LTA

ETSI EN 319 132

ASiC-E

Associated Signature Containers

ZIP-based containers packaging documents, signatures, and evidence records together

Extended container

ETSI EN 319 162

Three Signature Levels

Escalating protection to match your compliance requirements — from routine signing to qualified electronic signatures

Basic

Simple Electronic Signature

Internal documents, approvals, and routine signing

AlgorithmECDSA P-256
Timestamp—
Post-Quantum—
Long-Term Validation—
eIDAS LevelSES
Signing latency<100ms

Advanced

Advanced Electronic Signature

Commercial contracts, financial documents, and legal agreements

AlgorithmECDSA P-384
TimestampRFC 3161
Post-Quantum—
Long-Term Validation—
eIDAS LevelAdES
Signing latency<300ms
Recommended

Maximum

Qualified Electronic Signature

Regulated industries, government filings, and cross-border legal documents

AlgorithmECDSA P-384 + ML-DSA-65
TimestampRFC 3161
Post-QuantumML-DSA-65
Long-Term Validation30+ years
eIDAS LevelQES
Signing latency<500ms
Future-Proof Security

Quantum-Safe Document Signing

NIST-approved ML-DSA algorithms protect your documents against future quantum computing threats. Hybrid classical + PQC signatures ensure compatibility today while securing documents for decades.

ML-DSA-44

Security Level 2

Balanced performance and security for standard document signing workloads

NIST FIPS 2042.4 KB

ML-DSA-65

Security Level 3 (Default)

Recommended default providing strong quantum resistance for most use cases

NIST FIPS 2043.3 KB

ML-DSA-87

Security Level 5

Maximum security for the most sensitive documents and long-term preservation

NIST FIPS 2044.6 KB

SLH-DSA

Stateless Alternative

Hash-based stateless signatures for environments requiring minimal state management

NIST FIPS 205Variable

Regulatory Compliance

Built-in compliance with international electronic signature legislation and technical standards

eIDAS

European Union

SES, AdES, and QES electronic signature levels

ESIGN Act

United States

Federal electronic signature recognition

UETA

United States

Uniform Electronic Transactions Act (state level)

ZertES

Switzerland

Swiss electronic signature legislation

ETSI EN 319

International

Technical standards for CAdES, XAdES, PAdES, ASiC

FIPS 140-2

International

HSM certification for cryptographic key protection

Enterprise Use Cases

Trusted document signing for regulated industries and high-value transactions

Legal Documents

Contracts, agreements, and notarized documents with qualified electronic signatures

  • eIDAS QES-ready signing
  • Long-term validation
  • Court-admissible evidence
  • Multi-party signatures

Financial Services

Transaction records, regulatory filings, and audit trails with complete chain of custody

  • Regulatory compliance
  • Tamper-evident packaging
  • Automated batch processing
  • 30+ year retention

Healthcare

Patient records, prescriptions, and consent forms with long-term preservation requirements

  • HIPAA-compliant signing
  • Long-term archival
  • Timestamped audit trail
  • Evidence packages

Government & Public Sector

Official documents, permits, and citizen-facing services with national PKI integration

  • Government CA integration
  • Qualified TSA support
  • National PKI compliance
  • Cross-border recognition

Real Estate

Property deeds, mortgages, and title documents requiring long-term legal validity

  • PAdES-LTA signatures
  • Notarial equivalence
  • Multi-decade validity
  • Complete audit history

Corporate Compliance

Board resolutions, shareholder agreements, and regulatory reports with verifiable integrity

  • SOC 2 audit support
  • Immutable evidence records
  • Policy-enforced signing
  • Automated workflows

Performance Specifications

Enterprise-scale signing with sub-second latency across all signature levels

<100ms
latency

Basic Signing

<300ms
with timestamp

Advanced Signing

10,000+
docs/hour

Batch Processing

<100ms
per document

Verification

<500ms
classical + PQC

Maximum Signing

99.95%
SLA uptime

Availability

Architecture Highlights

Modular signing platform designed for flexibility, compliance, and scale

Core Components

Signing Orchestrator — Multi-level signing pipeline with policy enforcement
Format Handlers — PAdES, CAdES, XAdES, and ASiC-E processors
Crypto Engine — Classical ECDSA/RSA + post-quantum ML-DSA signing
LTV Manager — Long-term validation with automated re-timestamping
TSA Integration — Internal RFC 3161 TSA or external qualified TSA
Verification Engine — Multi-layer signature and certificate chain validation
Batch Processor — Parallel document processing with webhook delivery
Evidence Packager — ASiC-E containers with verification reports

Integration Points

HSM Providers — Azure Key Vault, AWS CloudHSM, PKCS#11, Thales, Utimaco
External CAs — Government and QTSP certificate authorities via CSR workflow
External TSAs — Qualified timestamp authorities with Basic, API Key, or mTLS auth
REST API — Sign, verify, batch, and manage via comprehensive endpoints
Webhooks — Real-time notifications for signing and batch events
Audit Logging — Complete audit trail for compliance and forensic analysis
Multi-Tenant — Full tenant isolation with per-tenant policies and configurations
KeyGrid PKI — Native integration with certificate lifecycle management

Sign Documents with Confidence

Deploy enterprise-grade document signing with quantum-safe protection and complete operational flexibility. Work with your existing trust infrastructure or let KeyGrid manage the full signing lifecycle.