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Digital Signatures for Software and Systems: Build Verifiable Trust for Code, Data, Documents, and Machine Communication
Paperback
Publisher: Independently Published
Published: Sep 7 2026
Pages: 176
Weight: 0.49
Height: 0.44 Width: 6.00 Depth: 9.00
Language: English
A valid digital signature can still authorize the wrong thing.
A container image can be correctly signed by a compromised release workflow. A firmware package can carry a genuine signature but still be an unsafe rollback. A PDF can have a mathematically valid signature without proving that the signer had authority to approve the transaction. A service can verify a signed request while accepting the wrong audience, identity, or replayed message.
The mathematics may be correct.
The trust decision may still be wrong.
Digital Signatures for Software and Systems is a practical guide to designing digital-signature systems that create verifiable trust, not merely cryptographically valid output.
Rather than teaching signatures as isolated algorithms, this book shows how signing and verification work inside real software, infrastructure, business records, APIs, supply chains, devices, and machine-to-machine systems.
Inside, you'll learn how to:
- Distinguish digital signatures from hashes, MACs, and encryption
- Define exactly what is being signed and eliminate ambiguous representations
- Connect public keys to meaningful human, workload, device, and organizational identities
- Design secure key lifecycles using software keys, KMS platforms, HSMs, secure elements, and short-lived credentials
- Work with RSA, ECDSA, EdDSA, ML-DSA, and SLH-DSA without treating algorithm selection as a leaderboard
- Build cryptographic agility into systems before algorithm migration becomes an emergency
- Design code-signing workflows around immutable artifacts and actual release authority
- Use Sigstore-style keyless signing, transparency evidence, and identity-based verification
- Strengthen software supply-chain security with provenance, SLSA, in-toto, SBOMs, and TUF
- Verify container images and attestations at deployment decision points
- Design secure software and firmware update systems with rollback resistance and role separation
- Understand PDF signatures, PAdES, CAdES, XAdES, CMS, trusted timestamps, and long-term validation
- Sign JSON, APIs, webhooks, event messages, and binary data using JWS and COSE while defending against replay and context substitution
- Apply SPIFFE, workload certificates, mTLS, and trust-domain federation to machine communication
- Build centralized signing platforms with brokers, policy enforcement, approvals, audit evidence, and controlled key authority
- Govern verification rules, trust stores, algorithms, exceptions, and cryptographic inventory
- Respond to stolen keys, abused signing services, compromised builders, certificate-authority failures, and verifier compromise
- Prepare realistic migration paths toward post-quantum digital signatures
The book also provides a 10-stage Further Learning Path that progresses from trust-model fundamentals and X.509 through practical signing, provenance, workload identity, signing-platform design, cryptographic inventory, and hands-on post-quantum transition testing.
Written for software engineers, security engineers, DevSecOps and platform professionals, PKI specialists, cloud architects, security architects, technical leaders, and anyone responsible for systems that must prove who authorized what, exactly what was protected, and why a verifier should accept it.
Don't stop at the signature is valid. Build trust that can be verified.
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