US 2004/0168049 A1Published application

Method for encrypting data of an access virtual private network (VPN)

OwnerIn-Zoo Leeinventor

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Abstract

In a method for encrypting data in an access virtual private network (VPN), a subscriber performs a data encrypting step for data security upon accessing the private network of his company. In this method, access is set up in a dead step according to an access attempt signal by a user. A link control protocol (LCP) negotiation is performed with regard to a mutual authentication method, maximum number of reception bytes, and whether to perform data compression. When the LCP negotiation determines that mutual authentication and data encryption are necessary, the authenticating step is performed first, and mutual authentication is performed by use of a challenge handshake authentication protocol/password authentication protocol (CHAP/PAP). If the authentication is normally completed, the data encryption is performed. Therefore, data encryption is performed together with user authentication so that data is not easily exposed and communication with guaranteed security is performed.

Claims10

Dependent claims

A method for encrypting data in an access virtual private network (VPN), comprising the steps of:

performing a link control protocol (LCP) negotiation regarding at least one of an authentication method, data compression, maximum data size receivable, link status monitoring, and whether to perform data encryption;
checking a user identification (ID) and a password when the LCP negotiation determines that mutual authentication is required, said negotiation being conducted by two terminals according to an LCP negotiation condition at the step of performing the LCP negotiation;
performing data encryption when the step of performing the LCP negotiation results in a determination that data encryption is to be performed;
performing network control protocol (NCP) negotiation in order to negotiate information for a Layer 3 communication access between a user and a private network;
and
transmitting and receiving data by forming a session between the user and the private network when the NCP negotiation is performed between the user and the private network.

3 more elements

Dependencies are inferred from the claim text.