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Quick Guide to Security: Basic Auth, SAML, API Keys, OAuth, JWTs, and Tokens

Basic Auth, SAML, API keys, OAuth, JWTs, and bearer tokens solve different security problems. Learn what each does and how to avoid exposing or misusing credentials.
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These terms describe different parts of security, not interchangeable ways to log in. Basic is an HTTP authentication scheme; SAML handles federated identity assertions; an API key is a credential; OAuth 2.0 is an authorization framework; JWT is a token format; and “bearer” describes how a token can be used. The right choice depends on what you need to prove or permit—and on how carefully the credential is protected.

How the terms differ

Term What it is Typical use Central security concern
Basic Auth HTTP authentication scheme A client sends a user ID and password for a protected resource Credential exposure in transit, logs, or reuse (RFC 7617, 2015)
SAML Federation standard An identity provider makes assertions a service provider can rely on Trust, signature and message validation, replay, and key configuration (OASIS SAML 2.0 Technical Overview, 2008)
API key Application or project credential An API caller identifies or authorizes itself to a provider Leakage, excessive permissions, weak restrictions, and poor revocation or rotation (Google Cloud guidance, accessed 2026-10-04)
OAuth 2.0 Authorization framework A client obtains access to protected resources using an access token Unsafe client or flow configuration and token leakage (RFC 9700, 2025)
JWT Compact token format for claims A system carries claims in a structured token Trusting claims without validating the token and its context (RFC 7519, 2015)
Bearer token Possession-based way to use a token A caller presents the token to access a resource Anyone who obtains it may use it (RFC 6750, 2012)

Authentication establishes or asserts identity; authorization determines what access is allowed. One system can combine both, but a credential or standard associated with one purpose does not automatically provide the other.

What Basic Auth does—and why Base64 is not encryption

HTTP Basic authentication joins a user ID and password with a colon, encodes the result as Base64, and sends it in an Authorization header. Conceptually, the header has this form: Authorization: Basic <Base64(user-id:password)>.

Base64 is an encoding, not encryption: it changes how bytes are represented, but does not make the credentials secret. RFC 7617 warns that Basic is not considered secure without an external protection system such as TLS, because the user ID and password are passed over the network as cleartext. Use HTTPS, avoid using a high-value personal password for an integration, and do not write authorization headers to logs.

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What SAML is used for

Security Assertion Markup Language 2.0 (SAML) supports federated identity: one party makes an assertion about a user or authentication event, and another party relies on it under an established trust relationship. It is commonly used for enterprise single sign-on between an identity provider and a service provider. SAML assertions are XML-based, and the message flow depends on the profile and bindings in use.

OASIS describes a pre-existing trust relationship—commonly supported by public-key infrastructure—as central to SAML federation. Deployment security still depends on the implementation and configuration, not on the label “SAML.” Verify the issuer, audience, destination, signature, and time constraints; protect against replay where required by the profile; and manage signing keys carefully. Consult the current profile and implementation guidance for the controls applicable to a particular integration.

What an API key identifies, and how to store it

An API key is generally a credential associated with an application or project that calls an API. It is not automatically proof of a human user’s identity. Depending on the provider, a key may identify a caller, authorize requests, or do both; it may also offer less granular user-level permissions than a delegated authorization flow.

Scope, restrictions, rotation, and revocation vary by API provider. Google Cloud’s guidance says not to hardcode keys in source code or store them in repositories, and recommends sending a key in an HTTP header or using a client library. Apply the provider’s own restrictions and transport guidance rather than assuming every service handles keys the same way.

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What OAuth does—and how it differs from Basic Auth

OAuth 2.0 is an authorization framework for delegated access to protected resources. A client obtains an access token and presents it to a resource server; the resource owner does not have to give that client their password. Basic Auth sends a user ID/password pair as the authentication credential, while OAuth’s purpose is to authorize access through tokens.

An OAuth access token can be opaque or structured. OAuth does not require JWT as its token format, and OAuth itself should not be treated as a blanket claim that a user has been authenticated. The IETF’s OAuth 2.0 Security Best Current Practice, RFC 9700, was published in 2025 and is the current security baseline identified here. Use current guidance for the chosen client and flow instead of copying older examples as safe defaults.

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What JWT means—and what it does not mean

A JSON Web Token (JWT) is a compact format for carrying claims. It can be used in different kinds of systems; it is not the same thing as OAuth. An OAuth token may be a JWT, but it may instead be opaque, and a JWT can appear outside OAuth.

A JWT may be integrity-protected with a message authentication code or a digital signature. A signed JWT is generally readable by whoever holds it; signing does not encrypt its contents. Do not trust a token just because its contents decode or parse. A consumer must validate the expected algorithm and cryptographic protection, issuer, audience, time claims, and application-specific claims. RFC 7519 notes that JWT is more compact and has a simpler model than SAML, while SAML offers greater expressivity and security options at the cost of added size and complexity.

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What a bearer token is and how to protect it

“Token” is a broad term for a credential or security assertion. “Bearer” describes a possession-based use: a caller can use the token simply by having it, without proving possession of a separate cryptographic key. RFC 6750 puts the risk plainly: “Any party in possession of a bearer token (a ‘bearer’) can use it in any way that any other party in possession of it can.”

RFC 6750 requires TLS for bearer-token use and calls on clients to safeguard tokens against leakage. Send the token in an Authorization header over HTTPS, not in a page URL. Keep it out of browser history, application and proxy logs, analytics, crash reports, and source control. Where the system allows it, limit scope and audience and use a short validity period to reduce the damage if a token is exposed.

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