How Daangn's Authentication Has Evolved

Daangn's Identity Service Team has progressively improved its authentication methods in line with service growth. Initially, it lowered the barrier to sign-up with SMS authentication to verify phone number ownership, but this led to difficulties in account recovery during number changes or device replacements, as well as issues with mass fraudulent account creation.

To address these issues, identity confirmation (CI verification) was introduced. It was made mandatory for new users, while existing users were naturally guided toward authentication through touchpoints requiring identity verification, such as the SaJu service. This lowered the difficulty of account recovery and improved fraud prevention.

As support for PC and web environments outside the app became necessary, an integrated authentication domain (accounts.daangn.com) based on the OAuth 2.0/OIDC standard was built. This provided consistent security levels and authentication experiences across various sub-services like real estate and used cars, and enabled integration with external services via Daangn SSO.

Upon entering global markets (North America, Japan), social login (LINE, Google, Apple, etc.) was introduced to reflect local usability differences. Additionally, Voice Call authentication was added to resolve SMS verification failures. SNA, a SIM-based authentication method, was also experimented with, but its rollout was put on hold as an increase in conversion rates could not be verified.