Security over a network

Details Security over a network Security over a network

2007-05-01

2007-05-01

Peeso, Thomas R. (Department: 2132)

Electrical computers and digital processing systems: support

Multiple computer communication using cryptography

Protection at a particular protocol layer

C713S152000, C713S164000, C713S166000

Reexamination Certificate

active

10351935

ABSTRACT:
According to one aspect of the present invention there is provided a method of preparing second protocol data for transmitting over a first protocol network comprising the steps of compressing the data to be transmitted in accordance with the first protocol, to produced first protocol compressed data and encrypting the first protocol compressed data in accordance with the first protocol to produce first protocol compressed and encrypted data. The invention consists of a means for the client to indicate to the first hop proxy that it wishes S/MIME encryption to be applied to part of an outgoing message. The first hop proxy then applies this encryption on behalf of the client. The encryption is therefore applied after the message has traversed the end terminal link. On the first proxy link, the message is sent without S/MIME encryption and can therefore benefit from compression (before the first hop IPSEC encryption is applied). A second aspect of the invention allows the support of end-to-end compression to be negotiated between end devices so that SIP compression can be applied to data before it is encrypted using S/MIME by the end system.

REFERENCES:
patent: 5495580 (1996-02-01), Osman
patent: 5623601 (1997-04-01), Vu
patent: 5774695 (1998-06-01), Autrey et al.
patent: 5778189 (1998-07-01), Kimura et al.
patent: 2002/0129236 (2002-09-01), Nuutinen
patent: 1107504 (2001-06-01), None
Blom R et al: “Conversational IP Multimedia Security” Ericsson Research, Sep. 9, 2002, pp. 147-151.

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