Authenticity
Authenticity is the quality of being genuine and faithfully representing a claimed identity, source, origin, expression, experience, or content.
Hacking Cryptography
Authenticity is the security property of establishing that a message is genuine and originated as claimed.
- How it is used
- Establishes whether messages and communicating entities are genuine rather than impersonated or modified.
- How deep it goes
- Explains integrity’s relationship to authenticity, then examines MAC constructions, HMAC defenses, signatures, and concrete forgery attacks.
- Examples
- Uses messaging identity, payment transactions, signed login tokens, envelopes, MAC attacks, and digital-signature forgery scenarios.
- What you can do after
- Evaluate/understand when integrity evidence identifies a sender, and distinguish shared-secret MACs from asymmetric signature verification.
Authorization in Action
Authenticity is the property of being able to establish with confidence who the parties to a communication are and prove that identity to others.
- How it is used
- Frames identity, authorization, privacy, and confidentiality as coordinated concerns when digital systems interact with people and organizations.
- How deep it goes
- Defines authenticity, contrasts it with privacy and confidentiality, and explains TLS-based authentication while stopping short of detailed cryptographic internals.
- Examples
- Uses an anonymous health consultation, online banking, TLS browser indicators, phishing domains, and authentication compromise to illustrate tradeoffs and consequences.
- What you can do after
- Evaluate identity assurances and design authorization policies that balance authenticating parties with privacy, confidentiality, compliance, and usability.
Introduction to Generative AI, Second Edition
Authenticity is the perceived genuineness or fidelity of a person, identity, expression, or creative work.
- How it is used
- Frames authenticity as a trust question for synthetic media, public evidence, privacy, marketing, and emerging forms of creative influence.
- How deep it goes
- Explores authenticity through practical benefits, deception risks, identity concerns, and institutional consequences without examining technical implementation.
- Examples
- Uses anonymized activists, the liar’s dividend, Lil Miquela, and AI-generated ketchup artworks as concrete cases.
- What you can do after
- Evaluate how synthetic media can protect privacy, simulate identity, manipulate audiences, or destabilize confidence in genuine evidence.
Read how Introduction to Generative AI, Second Edition explains authenticity →
Lead Developer Career Guide
The quality of behaving and communicating in a genuine manner consistent with one's actual experiences and values.
- How it is used
- Builds trust in mentoring and team leadership through transparent communication, shared experience, emotional openness, and acceptance of imperfection.
- How deep it goes
- Explains authenticity through workplace behaviors and examples, but does not develop a formal theory or detailed implementation framework.
- Examples
- Uses mentor vulnerability, concealed code changes, shared leadership challenges, assertive feelings, and imperfect code as teaching examples.
- What you can do after
- Practice authenticity by sharing experiences honestly, giving constructive feedback, expressing feelings appropriately, and learning openly from imperfections.
Read how Lead Developer Career Guide explains authenticity →
Related concepts
- data integritykind of · Data integrity is the property that data remains accurate, complete, consistent, and valid, with changes made only through authorized actions.
- authenticated encryption with associated dataproduced by · Authenticated encryption with associated data is a cryptographic construction that encrypts plaintext while authenticating the ciphertext and optional unencrypted associated data.
- digital signatureaddressed by · A digital signature is cryptographic data generated with a private key and verified with corresponding public information to authenticate data or its signer and detect alteration.
- privacycontrasts with · Privacy is the protection and controlled handling of information or activities to prevent inappropriate access, collection, use, or disclosure.
- security objectivekind of · A security objective is a desired outcome concerning the protection of information, systems, assets, or organizational interests.
- Galois/Counter Modeproduced by · Galois/Counter Mode is an authenticated-encryption mode that combines counter-mode encryption with authentication of ciphertext and associated data.
These guides are generated from the text of Manning books by Manning's knowledge graph and link to the sections they draw on. The full books are available on liveBook and at manning.com.