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O
O&M
OADR
Ob
Obfuscated C Contest
Obi-Wan Error
Object
Object Labeling
Object Reuse
Object Sharing
Objectionable-C
Obscure
Observables
OCR
Octal Forty
Octet
Odd Parity
Odd-Even Check
OEM
Oersted
Off The Trolley
Off-By-One Error
Office Of Information And Regulatory Affairs
Office Of Personnel Management
Official Use Only (OUO)
Offline
Offline Crypto-Operation
Off-Line Crypto-Operation
Off-Line Cryptosystem
Off-Site Security (Information, Processing)
Off-The-Shelf Item
Ogg /og/ v. [CMU]
Old Fart n.
Old Testament n.
OMB
OMB A-130
OMB CIR
OMB CIRC
OMB Circular A-127
ONA
One-Banana Problem n.
One-Line Fix n.
One-Liner Wars
One-Part Code
One-Time
One-Time Cryptosystem
One-Time Pad (OTP)
One-time password
One-Time Passwords
One-Time Tape (OTT)
One-Way Function
Ongoing communication
Online Crypto-Operation
On-Line Crypto-Operation
On-Line Cryptosystem
Ooblick
Op /op/ n.
OPCODE
Open DeathTrap n.
Open n.
Open Security
Open Security Environment
Open Source Information
Open Sources
Open Storage
Open Switch
Open System
Open Systems Interconnect Model OSI
Open Systems Interconnection
Open Systems Interconnection - Protocol Specifications
Open Systems Interconnection - Service Definitions
Open Systems Interconnection - Systems Management
Open Systems Interconnection Architecture
Open Systems Interconnection Protocol Specifications
Open Systems Interconnection Service Definitions
Open Systems Interconnection Systems Management
Open Systems Interconnection--Reference Model (OSI-RM)
Open Systems Security
OpenBSD
OpenPGP
Operand
Operating System
Operating System Integrity
Operating system lockdown
Operating system monitor
Operating System Security Features
Operating Systems
Operation
Operational Data
Operational Data Security
Operational Key
Operational Procedures Review
Operational Security Indicators
Operational Site Security Manual
Operational Waiver
Operations Code (OPCODE)
Operations Security (OPSEC)
Operations Security Appraisal
Operations Security Assessment
Operations Security Indicators
Operations Security Measures
Operations Security Monitoring
Operations Security Planning Guidance
Operations Security Process
Operations Security Survey
Operations Security Vulnerability
Operations Security Working Group
Operator
Operator Of A Federal Computer System
OPI
OPM
OPNAVINST
OPNAVINST 5239. 1A
OPSEC
OPT
Opt in
Opt out
Optical Character Reader
Optical Character Recognition
Optical Diff
Optical Grep
Optical Intelligence
Optical/Imaging Systems Security
Optimism
OPTINT
Optional Modification
Options
OR
OR/D2
Orange Book
Orange Book Terminology
ORCON
ORD
Organization C4 Systems Security Office
Organizational
Organizational Culture
Organizational Maintenance
Organizational Placement Of The IS/IT Security Function
Oriental Food
Orientation
Originating User
Orphan
Orphaned I-Node
Orthogonal adj. [from mathematics]
OS
OS/2
OSI
OSI (Reference Model of Open Systems Interconnection)
OSINT
OSU
OT&E
OTAD
OTAR
OTAT
OTOH
OTP
OTT
OUSDR&E
Outage
Outage Duration
Outage Probability
Outlook
Outlook Express
Out-Of-Band
Out-Of-Band Emission
Out-Of-Band Signaling
Output
Output-Only Devices
Outside Plant
Outsourced antivirus protection
Overall Security
Overflow
Overflow Bit n.
Overflow Pdl
Overhead Bit
Overhead Communications
Overrun n.
Oversight
Overt Channel
Overt Collection
Over-The-Air Key
Over-The-Air Key Distribution
Over-The-Air Key Transfer (OTAT)
Over-The-Air Rekeying (OTAR)
Overwrite
Overwrite Procedure
Overwriting
Owner
Owner Access Mode
Owner Of Data
Operating system lockdown
  • Tool that prevents changes from being made to registry settings, prevents Trojans from being installed, prevents log files from being changed, and does many other similar things.
NIATEC National Science Foundation Information Assurance Directorate Department of Homeland Security CISSE Scholarship For Service