US6367010B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for generating secure symmetric encryption and decryption
Assignee: Cisco Technology Inc
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Filing: 1999-07-02
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Granted: 2002-04-02
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Expires: 2019-07-02
Abstract
Abstract The present invention relates to a method for generating secure symmetric encryption/decryption via the Internet. The present method provides for a more advanced and sophisticated manner of preventing hackers from accessing sensitive and private information. Information is encrypted and decrypted using unique keys in combination with the recipient's PIN numbers. Each unique key corresponds to one recipient and is locally stored on the recipient's computer device. Thus, in order to decrypt information using the present invention, the recipient is required to provide the correct password while using the computer device that includes the unique key.
Inventors
- 👤 Rajamadam C. Venkatram
- 👤 Ravi Viswanath
- 👤 Unmesh Sahasrabuddhe
- 👤 Ashish Warty
- 👤 Rahul Khandkar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:47
CPC Classifications
H; H04; H04L; H04L9/00; H04L9/08; H04L9/0816; H04L9/0819; H04L9/0822; H04L9/0861; H04L9/0866
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
80 words
A method for encrypting electronic data transmitted by a sender server to a recipient device, the method comprising the steps of: generating a key for storing on the sender server; transmitting a copy of the key to the recipient device, wherein the copy of the key is unique to and permanently installed on the recipient device; encrypting electronic data from the sender server using the key; and transmitting the encrypted electronic data from the sender server to the recipient device.
Claim 2
Independent Claim
80 words
A method for encrypting electronic data transmitted by a sender server to a recipient device, the method comprising the steps of: generating a key for storing on the sender server; transmitting a copy of the key to the recipient device, wherein the copy of the key is unique to and permanently installed on the recipient device; encrypting electronic data from the sender server using the key; and transmitting the encrypted electronic data from the sender server to the recipient device.
Claim 3
Dependent Claim
16 words
A method according to claim 1 , wherein the key comprises a key-PIN and a key-Salt.
Claim 4
Dependent Claim
18 words
A method according to claim 2 , wherein the key-PIN and the key-Salt are generated using different seeds.
Claim 5
Dependent Claim
19 words
A method according to claim 3 , wherein the key-PIN and the key-Salt are generated using a security algorithm.
Claim 6
Dependent Claim
19 words
A method according to claim 2 , wherein the key-PIN and the key-Salt each comprise at least 256 bits.
Claim 7
Dependent Claim
18 words
A method according to claim 1 further comprising the step of generating the key using a security algorithm.
Claim 8
Dependent Claim
15 words
A method according to claim 1 , wherein the key is unique to each recipient.
Claim 9
Dependent Claim
19 words
A method according to claim 1 , wherein the key is transmitted to the recipient device with a plug-in.
Claim 10
Dependent Claim
14 words
A method according to claim 1 , wherein the electronic data comprises an e-mail.
Claim 11
Dependent Claim
15 words
A method according to claim 1 , wherein the electronic data comprises an e-mail attachment.
Claim 12
Independent Claim
93 words
A method for encrypting an electronic document and a key corresponding to the electronic document such that an encrypted electronic document and an encrypted key are simultaneously transmitted to a recipient device, the method comprising the steps of: (1) generating the encrypted electronic document by inputting an algorithm object, the key, and electronic document data into an encryption process; and (2) generating the encrypted key by inputting the algorithm object, a salt, and key data into the encryption process, thereby encrypting both the electronic document and the key corresponding to the electronic document.
Claim 13
Independent Claim
93 words
A method for encrypting an electronic document and a key corresponding to the electronic document such that an encrypted electronic document and an encrypted key are simultaneously transmitted to a recipient device, the method comprising the steps of: (1) generating the encrypted electronic document by inputting an algorithm object, the key, and electronic document data into an encryption process; and (2) generating the encrypted key by inputting the algorithm object, a salt, and key data into the encryption process, thereby encrypting both the electronic document and the key corresponding to the electronic document.
Claim 14
Dependent Claim
14 words
A method according to claim 11 , wherein the electronic document comprises an e-mail.
Claim 15
Dependent Claim
15 words
A method according to claim 11 , wherein the electronic document comprises an e-mail attachment.
Claim 16
Dependent Claim
33 words
A method according to claim 11 further comprising the step of generating the algorithm object by inputting a password having a key identification number and a user identification number into a security algorithm.
Claim 17
Dependent Claim
27 words
A method according to claim 11 further comprising the step of generating the salt by inputting electronic document identification data and a key-Salt into a security algorithm.
Claim 18
Independent Claim
101 words
A method for decrypting an encrypted electronic document and an encrypted key transmitted simultaneously from a sender server to a recipient device, the method comprising the steps of: separating the encrypted electronic document and encrypted key on the recipient device; inputting a user identification number having between 4 to 20 characters on the recipient device so that a unique password stored on the recipient device is called up, wherein the unique password includes at least 256 bits; using the unique password so that the encrypted key becomes a decrypted key; and using the decrypted key to decrypt the encrypted electronic document.
Claim 19
Independent Claim
101 words
A method for decrypting an encrypted electronic document and an encrypted key transmitted simultaneously from a sender server to a recipient device, the method comprising the steps of: separating the encrypted electronic document and encrypted key on the recipient device; inputting a user identification number having between 4 to 20 characters on the recipient device so that a unique password stored on the recipient device is called up, wherein the unique password includes at least 256 bits; using the unique password so that the encrypted key becomes a decrypted key; and using the decrypted key to decrypt the encrypted electronic document.
Claim 20
Dependent Claim
14 words
A method according to claim 16 , wherein the electronic document comprises an e-mail.
Claim 21
Dependent Claim
15 words
A method according to claim 16 , wherein the electronic document comprises an e-mail attachment.
Claim 22
Dependent Claim
39 words
A method according to claim 16 , wherein the unique password comprises a Key-PIN and a Key-Salt, and wherein using the unique password includes using the Key-PIN and the Key-Salt so that the encrypted key becomes a decrypted key.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2005-04-01 | 2005-10-01 | 2006-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2009-04-01 | 2009-10-01 | 2010-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2013-04-01 | 2013-10-01 | 2014-04-02 | $7700.00 | Window Closed / Lapsed |