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#authentication

User authentication mechanisms

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SMS OTP Login Backend Design for Airline Alerts with Rate Limits

SMS OTP Login Backend Design for Airline Alerts with Rate Limits

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5 min read
OAuth State Needs a Replay Boundary

OAuth State Needs a Replay Boundary

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5 min read
JWT vs. Sessions: Which Authentication Should You Use?

JWT vs. Sessions: Which Authentication Should You Use?

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8 min read
How to Build a Secure Authentication System

How to Build a Secure Authentication System

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16 min read
TOTP Explained: How Authenticator Apps Generate Login Codes

TOTP Explained: How Authenticator Apps Generate Login Codes

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3 min read
Customizing Keycloak: Themes, Login Flows, and Disabled-User Handling

Customizing Keycloak: Themes, Login Flows, and Disabled-User Handling

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19 min read
OAuth Callback Logs: Prove Without Leaking

OAuth Callback Logs: Prove Without Leaking

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4 min read
Credentials in the Agent's Reach: The Codex Memory-Sharing Issue

Credentials in the Agent's Reach: The Codex Memory-Sharing Issue

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3 min read
Authelia passkeys with TOTP as break-glass: why the config diff was empty

Authelia passkeys with TOTP as break-glass: why the config diff was empty

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3 min read
Phone verification on a free RapidAPI key: WhatsApp first, SMS when it fails

Phone verification on a free RapidAPI key: WhatsApp first, SMS when it fails

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4 min read
OAuth Email Links Need a Mailbox Trust Boundary

OAuth Email Links Need a Mailbox Trust Boundary

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5 min read
Session-Bound Verification Tokens for Safer Signups

Session-Bound Verification Tokens for Safer Signups

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4 min read
Sign in to a remote MCP server in Claude Code: /mcp and claude mcp login

Sign in to a remote MCP server in Claude Code: /mcp and claude mcp login

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5 min read
03. Client keys without a database

03. Client keys without a database

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1 min read
Twilio Verify vs MyOTP for small apps: the honest version

Twilio Verify vs MyOTP for small apps: the honest version

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2 min read
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