KT said on Wednesday it will launch Flexline ZTNA, a corporate internet service that applies a zero-trust security concept to its Flexline offering. Flexline is an SD-WAN-based service that supports lines, IP, equipment and operations monitoring, and can flexibly adjust bandwidth based on analysis of work environments and network use. The ZTNA version verifies permissions at each access using real-time AI detection and controls access based on device security status. KT also added quantum-cryptography equipment and said its security solutions can block cyberattacks.