Dynamic ID-based remote user authentication scheme

As the primacy safeguard of network security and information security,user authentication is very important.The authentication methods that combine user passwords with smart cards are used to avoid flaws caused by conventional password authentication methods,enhancing the security of network system and information system.A dynamic ID-based remote user authentication scheme is analyzed and its security vulnerability is also pointed out.Once the adversary obtains a user's smart card,the adversary can masquerade as the legal user to login remote servers even without the user's password in primary scheme.Further more,an enhanced scheme is presented.The modified scheme resist replay attack,forgery attack,guessing attack,insider attack and masquerade attack.