US Patent No: 5,189,700

Number of patents in Portfolio can not be more than 2000

Devices to (1) supply authenticated time and (2) time stamp and authenticate digital documents

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ATTORNEY / AGENT: (SPONSORED)
 

Importance

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Abstract

A device to provide authenticated time includes a clock and an encryption circuit enclosed by a seal with a controller for producing an encrypted authentication code of the time read for the clock upon request. An authentication device number can be combined with the time data before encryption. Additionally, the device can receive text or other data (either complete text or a hash of a text document) and combine the text data with the time data before encryption so that the encrypted authentication code is formed from the combined data. Optionally the device can produce, time stamp and authenticate the hash of data. Other material such as user and/or device sequence number and/or a random number can be included in the data used in forming the encrypted authentication code.

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First Claim

Related Publications

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Patent Owner(s)

Patent OwnerAddressTotal Patents
E-CONTACT TECHNOLOGIES LLCAUSTIN, TX4

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Blandford, Robert R Alexandria, VA 4 292

Cited Art

Patent Info (Count) # Cites Year
 
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Patent Citation Ranking

Forward Cites

Patent Info (Count) # Cites Year
 
WALKER DIGITAL, LLC (11)
6,289,453 Method and apparatus for secure measurement certification 78 1998
6,263,438 Method and apparatus for secure document timestamping 78 1998
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6,959,387 Method and apparatus for verifying secure document timestamping 1 2001
RE41960 Method and apparatus for verifying secure document timestamping 0 2005
8,069,056 Methods and apparatus for increasing and/or for monitoring a party's compliance with a schedule for taking medicines 4 2006
7,801,745 Methods and apparatus for increasing and/or monitoring a party's compliance with a schedule for taking medicines 4 2006
7,553,235 Method and apparatus for outputting a result of a game via a container 2 2006
RE42893 Method and apparatus for verifying secure document timestamping 1 2006
RE42018 Method and apparatus for verifying secure document timestamping 0 2006
8,250,369 Method and apparatus for secure measurement certification 0 2009
 
PITNEY BOWES INC. (8)
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JORASCH, JAMES A. (5)
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FUJITSU LIMITED (3)
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TIMECERTAIN, LLC (2)
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WALKER ASSET MANAGEMENT LTD. PARTNERSHIP (2)
5,923,763 Method and apparatus for secure document timestamping 119 1996
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XEROX CORPORATION (2)
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CDC PROPRIETE INTELLECTUELLE (1)
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DEUTSCHE TELEKOM AG (1)
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ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE (1)
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FIRST DATA CORPORATION (1)
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GOOGLE INC. (1)
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HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P. (1)
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LOAS TEI PTE., LLC (1)
6,530,023 Method and device that validates time of an internal source using an external source 19 1998
 
LOCKHEED MARTIN CORPORATION (1)
5,343,527 Hybrid encryption method and system for protecting reusable software components 261 1993
 
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. (1)
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MAXIM INTEGRATED PRODUCTS, INC. (1)
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MOTOROLA MOBILITY LLC (1)
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MOTOROLA, INC. (1)
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NEW AURORA CORPORATION (1)
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NXP B.V. (1)
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OY VEIKKAUS AB (1)
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PRIVARIS, INC. (1)
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PROGRAPHS, LLC (1)
6,250,549 Method for authenticating signatures and memorabilia kit employing same 14 1998
 
RENESAS ELECTRONICS CORPORATION (1)
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RMAIL LIMITED (1)
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SILANIS TECHNOLOGY INC. (1)
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THALES HOLDINGS UK PLC (1)
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THE UNITED STATES OF AMERICA AS REPRESENTED BY THE SECRETARY OF COMMERCE (1)
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TIMESTAMP.COM, INC. (1)
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OTHER [CHECK PATENT PROFILE FOR ASSIGNMENT INFORMATION] (7)
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7,532,544 Multifunction timer device 2 2007