Manual of U.S. Patent Classification
as of June 30, 2000

Class
713
ELECTRICAL COMPUTERS AND DIGITAL PROCESSING SYSTEMS: SUPPORT

Class definitions may be accessed by clicking on the class title, above.
Subclass definitions may be accessed by clicking on the subclass number, below.

Patents classified in a subclass may be accessed by clicking on the " " icon following the subclass number, below.

( please note that links to definitions and classified patents may not be available for some classes and subclasses )

For search strategies, please refer to the Classification Index Explanation of Data web page.

Subclass		Title
ClassTitle		===> ELECTRICAL COMPUTERS AND DIGITAL PROCESSING SYSTEMS: SUPPORT
1		DIGITAL DATA PROCESSING SYSTEM INITIALIZATION OR CONFIGURATION (E.G., INITIALIZING, SET UP, CONFIGURATION, OR RESETTING)
2		. Loading initialization program (e.g., booting, rebooting, warm booting, remote booting, BIOS, initial program load (IPL), bootstrapping)
100		RECONFIGURATION (E.G., CHANGING SYSTEM SETTING)
150		MULTIPLE COMPUTER COMMUNICATION USING CRYPTOGRAPHY
151		. Protection at a particular protocol layer
152		. . Application layer security
153		. Particular node (e.g., gateway, bridge, router, etc.) for directing data and applying cryptography
154		. . Including filtering based on content or address
155		. Central trusted authority provides computer authentication
156		. . By certificate
157		. . . Chain or hierarchical certificates
158		. . . Revocation or expiration
159		. . Including intelligent token
160		. Packet header designating cryptographically protected data
161		. . Data authentication
162		. Having particular address related cryptography
163		. . Multicast
164		. Security kernel or utility
165		. . File protection
166		. . Security levels
167		. . Object protection
168		. Particular communication authentication technique
169		. . Mutual entity authentication
170		. . Authentication of an entity and a message
171		. . Having key exchange
172		. . Intelligent token
173		. . . Pre-loaded with certificate
174		. . . Including particular multiplication or exponentiation circuit
175		. . By generation of certificate
176		. . Authentication by digital signature representation or digital watermark
177		. . . Signature tree
178		. . . Time stamp
179		. . . Including generation of associated coded record
180		. . Generating specific digital signature type (e.g., blind, shared, or undeniable)
181		. . Message digest travels with message
182		SYSTEM ACCESS CONTROL BASED ON USER IDENTIFICATION BY CRYPTOGRAPHY
183		. Solely password entry (no record or token)
184		. PIN/password generator device
185		. Using record or token
186		. . Biometric acquisition
187		COMPUTER PROGRAM MODIFICATION DETECTION BY CRYPTOGRAPHY
188		COMPUTER VIRUS DETECTION BY CRYPTOGRAPHY
189		DATA PROCESSING PROTECTION USING CRYPTOGRAPHY
190		. Computer instruction/address encryption
191		. Upgrade/install encryption
192		. Having separate add-on board
193		. By stored data protection
194		. Tamper resistant
200		SECURITY
201		. Computer network
202		. Password
300		COMPUTER POWER CONTROL
310		. By external command
320		. Power conservation
321		. . Programmable calculator with power saving feature
322		. . By clock speed control (e.g., clock on/off)
323		. . Active/idle mode processing
324		. . By shutdown of only part of system
330		. Power sequencing
340		. Having power source monitoring
400		SYNCHRONIZATION OF CLOCK OR TIMING SIGNALS, DATA, OR PULSES
401		. Using delay
500		CLOCK, PULSE, OR TIMING SIGNAL GENERATION OR ANALYSIS
501		. Multiple or variable intervals or frequencies
502		. Counting, scheduling, or event timing
503		. Correction for skew, phase, or rate
600		CLOCK CONTROL OF DATA PROCESSING SYSTEM, COMPONENT, OR DATA TRANSMISSION
601		. Inhibiting timing generator or component
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		FOREIGN ART COLLECTIONS
		*********************************
		Any foreign patents or non-patent literature from subclasses that have been reclassified have been transferred directly to FOR Collection listed below. These collections contain ONLY foreign patents or nonpatent literature. The parenthetical references in the Collection titles refer to the abolished subclasses from which these Collections were derived.
FOR 123		. Having cryptographic user or record actuated authentication (380/23)
FOR 125		. . Computer (380/25)

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tel: (703) 306-2600
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Last Modified: 6 October 2000