1. Transaction signature in the form of a query / response using a public key password One-time password! * Generate OTPSEED through digital signature of public key cryptography. * Generate a one-time password through random numbers delivered from the server every transaction. * Integrity of transactions is guaranteed by going through signature verification and extract comparison instead of simple comparison of existing symmetric key method. * Excellent security compared to existing visual sync / event sync. (Financial Security Agency security review completed)2. Only 6-digit OTP can be used for biometric authentication (face, fingerprint, etc.). * Create 6-digit OTP without entering the site-> Enhanced Convenience * After checking the request contents-> reconfirmation of hacking * Check with biometric information registered in the terminal-> Strengthen security3. Legtech service in a cloud environment that is easy to build and use. * Provides service of excellent Amazon cloud environment * Service can be used by simple API call without system construction. * Service can be used at low cost without initial construction cost.