What is Authentication?
Authentication is the process of verifying that a user is who they claim to be before granting access to a system. It relies on credentials such as passwords, biometrics or one-time codes, and is the first line of defence protecting user accounts and data.
What is authentication?
Authentication is the process of confirming that someone, or something, is who they claim to be before a system grants access. When a user signs in, the application checks the evidence they provide - a password, a fingerprint, a code from an app - against what it knows about that user. If the evidence matches, the user is authenticated and allowed in. It is the front door of any secure product and the foundation on which all other access decisions rest.
It is important to distinguish authentication from authorisation. Authentication answers "who are you?", while authorisation answers "what are you allowed to do?". A user is authenticated once, then authorised for specific actions throughout their session.
How does authentication work?
Authentication relies on one or more factors, traditionally grouped into three categories: something you know, such as a password; something you have, such as a phone or hardware key; and something you are, such as a fingerprint or face. The system collects the chosen factor, verifies it against stored records - passwords are stored as salted hashes, never in plain text - and then issues a session token that proves the user's identity for subsequent requests without asking them to sign in again.
What are common authentication methods?
Products combine methods depending on the sensitivity of the data they protect:
- Password authentication - the traditional method, increasingly hardened with strength rules.
- Multi-factor authentication - combining two or more factors for stronger assurance.
- Biometric authentication - fingerprint or facial recognition on the device.
- Single sign-on - one identity used across multiple applications.
- Passwordless and social login - magic links, passkeys or login via an existing provider.
What are authentication best practices?
Never store passwords in plain text - always hash them with a strong, salted algorithm. Offer multi-factor authentication, especially for sensitive accounts, because it dramatically reduces the impact of a stolen password. Use short-lived, securely stored session tokens and provide a clear way to revoke them. Rate-limit and monitor login attempts to slow brute-force attacks, and lean on proven standards and libraries rather than inventing your own scheme, which is a frequent source of serious vulnerabilities.
How PixelForce approaches authentication
At PixelForce, authentication is designed deliberately in Phase 1 - Scoping and Design, because it shapes the security and user experience of the whole product. Our in-house Adelaide team selects the right method for the product's risk profile rather than defaulting to one pattern, and we favour proven standards and libraries over bespoke schemes. Across 100+ products shipped - including high-trust platforms such as EzLicence, which has facilitated $100M+ in bookings - secure authentication is foundational. This work fits within our broader app development company australia services, and for systems handling sensitive enterprise data it connects to our aws app migration services.
Where this applies
The PixelForce services where Authentication matters most - explore how we put it to work in client products.
Frequently asked questions
Authentication verifies identity - it confirms you are who you say you are, typically at sign-in. Authorisation determines what an authenticated user is permitted to do, such as which pages they can view or actions they can take. Authentication always comes first; authorisation governs access afterwards. A system can authenticate a user successfully and still deny them access to a restricted resource through authorisation.
For any product holding sensitive data or financial information, it is strongly recommended. Multi-factor authentication requires a second proof of identity beyond a password, which means a stolen or guessed password alone is not enough to break in. It substantially reduces account takeover risk for a modest amount of user friction. For low-risk applications it can be optional, but offering it is good practise.
They are increasingly being supplemented and, in places, replaced by passwordless methods such as passkeys, biometrics and magic links. These reduce the risks tied to weak or reused passwords and improve the user experience. Adoption is growing steadily, but passwords remain widespread, so most products support a mix. The direction of travel is clearly toward stronger, more convenient passwordless options.
Passwords must never be stored in plain text or with reversible encryption. They should be hashed using a strong, deliberately slow, salted algorithm designed for the purpose, so that even if the database is breached the original passwords cannot be recovered. The application compares the hash of an entered password against the stored hash. Building this with proven libraries rather than custom code is essential.
Have an idea worth building?
Whether you are validating a concept or scaling a product, our Adelaide team can scope it properly. Book a free consultation and we will map the fastest path from idea to launch.
- Top Clutch App Development Company · Australia
- 100% in-house · Adelaide HQ
- 100+ products shipped
- 99.99% crash-free