Clock control of data processing system, component, or data transmission

Inhibiting timing generator or component

Clock, pulse, or timing signal generation or analysis

Correction for skew, phase, or rate

Counting, scheduling, or event timing

Multiple or variable intervals or frequencies

Computer power control

By external command

Having power source monitoring

Power conservation

Active/idle mode processing

By clock speed control (e.g., clock on/off)

By shutdown of only part of system

Programmable calculator with power saving feature

Power sequencing

Computer program modification detection by cryptography

Computer virus detection by cryptography

Data processing protection using cryptography

By stored data protection

Computer instruction/address encryption

Having separate add-on board

Tamper resistant

Upgrade/install encryption

Digital data processing system initialization or configuration (e.g., initializing, set up, configuration, or resetting)

Loading initialization program (e.g., booting, rebooting, warm booting, remote booting, bios, initial program load (ipl), bootstrapping)

Electric signal modification (e.g., scrambling) (380/9)

Multiple computer communication using cryptography

Central trusted authority provides computer authentication

By certificate

Chain or hierarchical certificates

Revocation or expiration

Including intelligent token

Having particular address related cryptography

Multicast

Packet header designating cryptographically protected data

Data authentication

Particular communication authentication technique

Authentication by digital signature representation or digital watermark

Including generation of associated coded record

Signature tree

Time stamp

Authentication of an entity and a message

By generation of certificate

Generating specific digital signature type (e.g., blind, shared, or undeniable)

Having key exchange

Intelligent token

Including particular multiplication or exponentiation circuit

Pre-loaded with certificate

Message digest travels with message

Mutual entity authentication

Particular node (e.g., gateway, bridge, router, etc.) for directing data and applying cryptography

Including filtering based on content or address

Protection at a particular protocol layer

Application layer security

Security kernel or utility

File protection

Object protection

Security levels

Reconfiguration (e.g., changing system setting)

Synchronization of clock or timing signals, data, or pulses

Using delay

Synchronization of plural processors

System access control based on user identification by cryptography

Pin/password generator device

Solely password entry (no record or token)

Using record or token

Biometric acquisition