Patent US6061448A successfully refreshed from Google Patents.
US6061448A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and system for dynamic server document encryption
Assignee: Silicon Valley Bank Inc
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Filing: 1997-04-01
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Granted: 2000-05-09
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Expires: 2017-04-01
Abstract
Abstract A method and system are provided for secure document delivery over a wide area network, such as the Internet. A sender directs a Delivery Server to retrieve an intended recipient's public key. The Delivery Server dynamically queries a certificate authority and retrieves the public key. The public key is transmitted from the Delivery Server to the sender. The sender encrypts the document using a secret key and then encrypts the secret key using the public key. Both encrypted document and encrypted secret key are uploaded to the Delivery Server, and transmitted to the intended recipient. The intended recipient then uses the private key associated with the public key to decrypt the secret key, and uses the secret key to decrypt the document. In an alternative, equally preferred embodiment of the invention, the sender uses the public key to encrypt the document. In yet another embodiment, the server transmits the document to the Delivery Server for encryption.
Inventors
- 👤 Jeffrey C. Smith
- 👤 Jean-Christophe Bandini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 23:17
CPC Classifications
H; H04; H04L; H04L63/00; H04L63/04; G; G06; G06Q; G06Q10/00; G06Q10/10; H04L51/00; H04L63/0428; H04L63/045; H04L63/08; H04L63/0823; H04L9/00; H04L9/08; H04L9/0816; H04L9/0819; H04L9/0825; H04L9/083; H04L2209/00; H04L2209/76; H04L51/21; H04L51/234
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
100 words
A method for secure document delivery from a sender over a wide area network, comprising the steps of: a sender encrypting a document using a secret key; the sender contacting a Delivery Server to query a public key associated with an intended recipient; the Delivery Server dynamically retrieving the public key in real time from a certificate authority; the Delivery Server transmitting the public key back to the sender; the sender encrypting the secret key with the public key; and the sender transmitting the encrypted document and the encrypted secret key to the Delivery Server for transmission to the recipient.
Claim 2
Independent Claim
100 words
A method for secure document delivery from a sender over a wide area network, comprising the steps of: a sender encrypting a document using a secret key; the sender contacting a Delivery Server to query a public key associated with an intended recipient; the Delivery Server dynamically retrieving the public key in real time from a certificate authority; the Delivery Server transmitting the public key back to the sender; the sender encrypting the secret key with the public key; and the sender transmitting the encrypted document and the encrypted secret key to the Delivery Server for transmission to the recipient.
Claim 3
Dependent Claim
20 words
The method of claim 1, further comprising the step of the recipient decrypting the secret key using a private key.
Claim 4
Dependent Claim
19 words
The method of claim 2, further comprising the step of the recipient decrypting the document using the secret key.
Claim 5
Dependent Claim
21 words
The method of claim 1, wherein the sender encrypts the document prior to receiving the public key from the Delivery Server.
Claim 6
Dependent Claim
21 words
The method of claim 1, wherein the sender encrypts the document subsequent to receiving the public key from the Delivery Server.
Claim 7
Dependent Claim
34 words
The method of claim 1, wherein the wherein the document is one of a contiguous collection of data, a stream of data, a video, audio data, an animation, a formatted document, or a database.
Claim 8
Dependent Claim
27 words
The method of claim 1, further comprising the step of the sender forwarding the address of the intended recipient and document delivery instructions to the Delivery Server.
Claim 9
Dependent Claim
13 words
The method of claim 1, wherein the wide area network is the Internet.
Claim 10
Dependent Claim
28 words
The method of claim 1, wherein the recipient is one of a desktop computer, a printer, a fax machine, a personal digital assistant, or a network computer device.
Claim 11
Dependent Claim
27 words
The method of claim 1, wherein the sender is one of a desktop computer, an Internet browser device, an Internet telephone device, or a network computer device.
Claim 12
Dependent Claim
43 words
The method of claim 1, wherein the database server dynamically retrieves the public key from one of a certificate authority, an Internet server, personal digital assistant, the intended recipient's desktop computer, or from an intranet server connected to the intended recipient's desktop computer.
Claim 13
Independent Claim
88 words
A method for secure document delivery from a sender over a wide area network, comprising the steps of: a sender contacting a Delivery Server to query a public key associated with an intended recipient of a document; the Delivery Server dynamically retrieving the public key in real time from a certificate authority; the Delivery Server transmitting the public key back to the sender; the sender encrypting the document with the public key; and the sender transmitting the encrypted document to the Delivery Server for transmission to the recipient.
Claim 14
Independent Claim
88 words
A method for secure document delivery from a sender over a wide area network, comprising the steps of: a sender contacting a Delivery Server to query a public key associated with an intended recipient of a document; the Delivery Server dynamically retrieving the public key in real time from a certificate authority; the Delivery Server transmitting the public key back to the sender; the sender encrypting the document with the public key; and the sender transmitting the encrypted document to the Delivery Server for transmission to the recipient.
Claim 15
Dependent Claim
19 words
The method of claim 12, further comprising the step of the recipient decrypting the document using a private key.
Claim 16
Dependent Claim
28 words
The method of claim 12, wherein the recipient is one of a desktop computer, a printer, a fax machine, a personal digital assistant, or a network computer device.
Claim 17
Dependent Claim
27 words
The method of claim 12, wherein the sender is one of a desktop computer, an Internet browser device, an Internet telephone device, or a network computer device.
Claim 18
Dependent Claim
43 words
The method of claim 12, wherein the database server dynamically retrieves the public key from one of a certificate authority, an Internet server, personal digital assistant, the intended recipient's desktop computer, or from an intranet server connected to the intended recipient's desktop computer.
Claim 19
Independent Claim
94 words
A method for secure document delivery from a sender over a wide area network, comprising the steps of: a sender contacting a Delivery Server to query a public key associated with an intended recipient; the Delivery Server dynamically retrieving the public key in real time from a certificate authority; the sender transmitting the document to the Delivery Server; the Delivery Server encrypting the document with a secret key and encrypting the secret key with the public key; and the Delivery Server transmitting the encrypted secret key and the encrypted document to the intended recipient.
Claim 20
Independent Claim
94 words
A method for secure document delivery from a sender over a wide area network, comprising the steps of: a sender contacting a Delivery Server to query a public key associated with an intended recipient; the Delivery Server dynamically retrieving the public key in real time from a certificate authority; the sender transmitting the document to the Delivery Server; the Delivery Server encrypting the document with a secret key and encrypting the secret key with the public key; and the Delivery Server transmitting the encrypted secret key and the encrypted document to the intended recipient.
Claim 21
Dependent Claim
20 words
The method of claim 17, further comprising the step of the recipient decrypting the secret key using a private key.
Claim 22
Dependent Claim
19 words
The method of claim 18, further comprising the step of the recipient decrypting the document using the secret key.
Claim 23
Dependent Claim
28 words
The method of claim 17, wherein the recipient is one of a desktop computer, a printer, a fax machine, a personal digital assistant, or a network computer device.
Claim 24
Dependent Claim
30 words
The method of claim 17, wherein the sender is one of a desktop computer, a network computer device, an Internet browser device, an Internet telephone device, or a fax machine.
Claim 25
Dependent Claim
43 words
The method of claim 17, wherein the database server dynamically retrieves the public key from one of a certificate authority, an Internet server, personal digital assistant, the intended recipient's desktop computer, or from an intranet server connected to the intended recipient's desktop computer.
Claim 26
Dependent Claim
34 words
The method of claim 17, further comprising the step of: dynamically generating a public key at said Delivery Server where said recipient does not have a public key at the time of said retrieval.
Claim 27
Dependent Claim
37 words
The method of claim 23, said dynamic generating step further comprising the steps of: forwarding a message to said recipient, the reading of which retrieves a module that constructs a private/public key pair on said recipient's system.
Claim 28
Dependent Claim
26 words
The method of claim 24, said dynamic generating step further comprising the step of: forwarding said public key from said recipient's system to said Delivery Server.
Claim 29
Independent Claim
100 words
A system for secure document delivery from a sender over a wide area network, comprising: a Delivery Server for querying a public key associated with an intended recipient at the direction of a sender, the Delivery Server dynamically retrieving the public key in real time from a certificate authority and transmitting the public key back to the sender; the sender for encrypting a document using a secret key, the sender encrypting the secret key with the public key and the sender transmitting the encrypted document and the encrypted secret key to the Delivery Server for transmission to the intended recipient.
Claim 30
Independent Claim
100 words
A system for secure document delivery from a sender over a wide area network, comprising: a Delivery Server for querying a public key associated with an intended recipient at the direction of a sender, the Delivery Server dynamically retrieving the public key in real time from a certificate authority and transmitting the public key back to the sender; the sender for encrypting a document using a secret key, the sender encrypting the secret key with the public key and the sender transmitting the encrypted document and the encrypted secret key to the Delivery Server for transmission to the intended recipient.
Claim 31
Dependent Claim
31 words
The system of claim 26, further comprising: means for decrypting the secret key by the recipient using a private key; and means for decrypting the encrypted document using the secret key.
References Cited (Backward Citations)
US4532588A
Cited
US4713780A
Cited
US4754428A
Cited
US4837798A
Cited
US4853961A
Cited
US5008814A
Cited
US5210824A
Cited
US5495610A
Cited
US5293250A
Cited
US5424724A
Cited
US5313521A
Cited
US5235642A
Cited
US5406557A
Cited
US5404231A
Cited
US5513126A
Cited
US5509074A
Cited
US5416842A
Cited
US5535276A
Cited
US5805719A
Cited
US5608874A
Cited
US5550984A
Cited
US5710883A
Cited
US5790793A
Cited
US5677955A
Cited
US5675507A
Cited
US5812776A
Cited
US5708780A
Cited
US5764906A
Cited
US5758343A
Cited
US5706442A
Cited
US5903723A
Cited
US5781901A
Cited
US5751956A
Cited
US5855020A
Cited
US5850442A
Cited
US5727156A
Cited
US5845084A
Cited
US5778372A
Cited
US5793972A
Cited
US5860068A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-05-09 | 2003-11-08 | 2004-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-05-09 | 2007-11-08 | 2008-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-05-09 | 2011-11-08 | 2012-05-09 | $7700.00 | Window Closed / Lapsed |