No CSTNET passport?

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What's CSTNET passport?

CSTNET passport is the combination of an email address and a password that you use to sign in to services like, DDL , CSP, dHome, mail. If you don't have a CSTNET passport, you can sign up for free at any time.

CAS mail can be used as CSTNET passport to sign in.

Duckling Passport is upgraded to CSTNET passport.