PKCE
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Definition
PKCE is an OAuth extension that uses a code verifier and code challenge to protect Authorization Code Flow against code interception.
Background
Defined in RFC 7636, it became especially important for mobile apps and browser-based clients that cannot safely hold a client secret.
Position
It is the concrete mechanism that strengthens OAuth 2.1 and MCP authorization flows.
Distinctions
- PKCE is not an authentication protocol; it strengthens OAuth Authorization Code Flow.
- It can be used with OIDC, but it is not OIDC itself.
Primary source-backed reference selected for this concept.
Sources
Page Context
- OAuth 2.1 PKCE Flow and MCP Authentication Authorization Practical Guide
OAuth 2.1 PKCE flow and MCP authentication authorization practical guide 1. Executive Summary In practice, MCP server authentication and authorization can be easily understood a...
Quote: OAuth 2.1 PKCE Flow and MCP Authentication Authorization Practical Guide developer-tools
Pages
- OAuth 2.1 PKCE Flow and MCP Authentication Authorization Practical Guide
For beginners, we will organize the relationship between the MCP server, OIDC provider, OAuth client, Claude-based client, and OpenAPI-only API from the perspective of communication flow and settings.
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