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E-commerce Security, E-commerce Security Environment, Dimensions of E-commerce Security: Integrity, Nonrepudiation, Authenticity, Confidentiality, Privacy, Availability; Security Threats in E-commerce: Malicious Code, Potentially Unwanted Programs, Phishing, Hacking, Cyber vandalism and Hacktivism, Data Breaches, Credit Card Fraud, Identity Fraud, Spoofing, Pharming, and Spam, Sniffing and Man-in-The-Middle Attacks, DOS and DDOS Attacks, Insider Attacks, Social Network Security Issues, Mobile Platform Security Issues, Cloud Security Issues, IOT Security Issues; Achieving E-commerce Security: Cryptography, Digital Envelopes, Digital Certificates and Public Key Infrastructure, SSL, TLS, HTTPS, VPNs, Firewalls, Intrusion Detection and Prevention, Antiviruses; E-commerce Security Plan, Laws, Government and Public Policies, Electronic Transaction Act of Nepal