Frame relay networks: specifications and implementations
Frame relay networks: specifications and implementations
The official PGP user's guide
Description of a New Variable-Length Key, 64-bit Block Cipher (Blowfish)
Fast Software Encryption, Cambridge Security Workshop
Implementation of Virtual Private Networks at the Transport Layer
ISW '99 Proceedings of the Second International Workshop on Information Security
Hash functions based on block ciphers
EUROCRYPT'92 Proceedings of the 11th annual international conference on Theory and application of cryptographic techniques
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The main aims of Virtual Private Network (VPN) are to isolate a distributed network from outsiders, as well as to protect the confidentiality and integrity of sensitive information traversing a nontrusted network such as the Internet. However, some problems arise when security is considered as the unique problem because VPN users suffer from restrictions in their access to the network. They are not free to use traditional Internet services such as electronic mail exchange with non-VPN users, and to access Web and FTP servers external to the organization. This paper presents a new solution that allows the open use of traditional network services running over TCP and UDP layers, while maintaining strong security features. The new scheme works at the TCP/IP transport layer and does not require the addition of new hardware because it is a totally software solution. As a consequence, the application is totally portable. Moreover, and because of its implementation at the transport layer, there is no need to modify any traditional communication applications previously installed in the network system.