WO1997014236B1 - Method and apparatus for relaying digitally signed messages - Google Patents

Method and apparatus for relaying digitally signed messages

Info

Publication number
WO1997014236B1
WO1997014236B1 PCT/US1996/014759 US9614759W WO9714236B1 WO 1997014236 B1 WO1997014236 B1 WO 1997014236B1 US 9614759 W US9614759 W US 9614759W WO 9714236 B1 WO9714236 B1 WO 9714236B1
Authority
WO
WIPO (PCT)
Prior art keywords
message
original
digital signature
gateway
channel
Prior art date
Application number
PCT/US1996/014759
Other languages
French (fr)
Other versions
WO1997014236A1 (en
Filing date
Publication date
Application filed filed Critical
Priority to AU70720/96A priority Critical patent/AU7072096A/en
Publication of WO1997014236A1 publication Critical patent/WO1997014236A1/en
Publication of WO1997014236B1 publication Critical patent/WO1997014236B1/en

Links

Abstract

A communication network (10) includes any number of interconnected nodes (20), including a sending node (22), a sending gateway (24), a receiving gateway (26), and a destination node (28). A low capacity or expensive communication channel (30) resides between the sending and receiving gateways (24, 26). An original digitally signed message is sent from the sending node (22) toward the destination node (28). When the original message arrives at the sending gateway (24), the original signature is verified. If verified, the sending gateway (24) shrinks the original message into a reduced message and re-signs the message with a gateway digital signature before sending the message onward through the communication channel (30) toward the destination node (28). The destination node (28) verifies the gateway digital signature against the reduced message and is not required to de-compress the reduced message into a precise duplicate of the original message.

Claims

AMENDED CLAIMS[received by the International Bureau on 16 April 1997 (16.04.97); original claims 1-10 replaced by amended claims 1-11 (3 pages)]
1. A method of transferring a digitally signed message through a communication channel, said method comprising the steps of: receiving an original message at a gateway to said channel, said original message having an original digital signature associated therewith; verifying an authenticity of said original digital signature with respect to said original message at said gateway; shrinking said original message into a reduced message according to predefined rules thereby reducing an amount of data to be transferred over the communication channel; determining a gateway digital signature for said reduced message thereby preserving an accurate and verifiable digital signature when transferred over the communica ion channel; and sending said reduced message and said gateway digital signature through said communication channel .
2. A method as claimed in claim 1 wherein said shrinking step comprises the steps of: identifying target information in said original message; and deriving said reduced message from said target information.
3. A method as claimed in claim 1 additionally comprising the step of compressing said reduced message so that said reduced message may be reconstructed after passing through said channel.
4. A method as claimed in claim 1 wherein: said original message is directed to a destination node; and said method additionally comprises the step of archiving said reduced message and said gateway digital signature through a network node other than said destination node.
5. A method as claimed in claim 1 wherein: said sending step is performed when said verifying step verifies said original digital signature; and said method additionally comprises the step of refraining from sending said message through said channel when said verifying step fails to verify said original digital signature.
6. A method as claimed in claim 1 wherein: said original message is directed to a destination node; and said method additionally comprises the step of archiving said original digital signature and said original message through a network node other than said destination node.
7. A method as claimed in claim 1 additionally comprising the steps of: receiving a private gateway key; and using said private gateway key in said determining step to determine said gateway digital signature.
8. A method as claimed in claim 1 additionally comprising the steps of: identifying a sender of said original message; and appending a sender identity to said at least a portion of said original message sent during said sending step.
9. A communication network gateway for transferring a digitally signed message through a communication channel, said gateway comprising: a first port for receiving an original message having a destination reachable through said channel, said original message having an original digital signature associated therewith; a controller coupled to said first port and configured to verify said original digital signature with respect to said original message, to shrink said original message into a reduced message according to predefined rules thereby reducing an amount of data to be transferred over said channel, and to determine a gateway digital signature for said reduced message thereby preserving an accurate and verifiable digital signature when transferred over said channel; and a second port coupled to said controller, said second port being configured to send said reduced message and said gateway digital signature through said channel.
10. The communication network gateway of claim 9 wherein said controller archives said reduced message and said gateway digital signature.
11. The communication network gateway of claim 9 wherein said second port sends said reduced message and said gateway digital signature through said channel only when said original digital signature is verified.
PCT/US1996/014759 1995-09-25 1996-09-13 Method and apparatus for relaying digitally signed messages WO1997014236A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU70720/96A AU7072096A (en) 1995-09-25 1996-09-13 Method and apparatus for relaying digitally signed messages

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US53304095A 1995-09-25 1995-09-25
US08/533,040 1995-09-25

Publications (2)

Publication Number Publication Date
WO1997014236A1 WO1997014236A1 (en) 1997-04-17
WO1997014236B1 true WO1997014236B1 (en) 1997-05-29

Family

ID=24124210

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1996/014759 WO1997014236A1 (en) 1995-09-25 1996-09-13 Method and apparatus for relaying digitally signed messages

Country Status (3)

Country Link
US (1) US5943426A (en)
AU (1) AU7072096A (en)
WO (1) WO1997014236A1 (en)

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