| AAA | Authentication, Authorization, and Accounting |
| AC | Actual Cost |
| ACDF | Access Control Decision Function |
| ACI | Access Control Information |
| ACL | Access Control List |
| ACWP | Actual Cost of Work Performed |
| AD | Active Directory/Activity Description |
| ADM | Arrow Diagramming Method |
| AES | Advanced Encryption Standard |
| AF | Actual Finish Date |
| ADRP | Army’s DISN Router Program |
| ADSL | Asymmetric Digital Subscriber Line |
| AFIWC | Air Force Information Warfare Center |
| AH | Authentication Header |
| AIS | Automated Information System |
| API | Application Program Interface |
| ASCII | American Standard Code for Information Interchange |
| ANS1 | Abstract Syntax Notation |
| ARP | Address Resolution Protocol |
| AS | Actual Start Date |
| ATM | Asynchronous Transfer Mode |
| AV | Antivirus |
| BAC | Budget at Completion |
| BAPI | Biometrics Application Program Interface |
| BCA | Bridge Certificate Authority |
| BCWP | Budgeted Cost of Work Performed |
| BCWS | Budgeted Cost of Work Scheduled |
| BIOS | Basic Input/Output System |
| BN | Backbone Network |
| BOM | Bill of Materials |
| BOOTP | Boot Protocol |
| BSD | Berkley Software Design |
| C&A | Certification and Accreditation |
| C/AII | Corporate/Agency Information Infrastructure |
| C2 | Command and Control |
| C4I | Command, Control, Communications, Computer, and Intelligence |
| CA | Certification Authority/Control Account |
| CALEA | Communications Assistance for Law Enforcement Act |
| CAN | Campus Area Network |
| CAP | Control Account Plan |
| CAPI | Cryptographic Application Programming Interface |
| CAT | Common Authentication Technology |
| CAW | Certificate Authority Workstation |
| CC | Common Criteria |
| CCB | Change Control Board |
| CCE | Common Configuration Enumeration |
| CCI | Controlled Cryptographic Item |
| CDMA | Code Division Multiple Access |
| CDR | Critical Design Review |
| CDSA | Common Data Security Architecture |
| CERT | Computer Emergency Response Team |
| CFD | Common Fill Devices |
| CGE | Cisco Global Exploiter |
| CGI | Common Gateway Interface |
| CH | Correspondence Host |
| CI | Cryptographic Interface/Configuration Item |
| CIO | Chief Information Officer |
| CIAC | Computer Incident Advisory Capability |
| CIDF | Common Instruction Detection Framework |
| CIK | Crypto-Ignition Key |
| CIRT | Computer Incident Response Team |
| CISO | Chief Information Security Officer |
| CKL | Compromised Key List |
| CM | Configuration Management |
| CMA | Certificate Management Authority |
| CMI | Certificate Management Infrastructure |
| CMIP | Common Management Information Protocol |
| CMP | Certificate Management Protocols |
| CMS | Certificate Management Systems |
| CMUA | Certificate Management User Agent |
| COA | Course of Action |
| COE | Common Operating Environment |
| COMSEC | Communications Security |
| CONOPS | Concept of Operations |
| COQ | Cost of Quality |
| CORBA | Common Object Request Broker Architecture |
| COTS | Commercial-Off-The-Shelf |
| CP | Certificate Policy/Critical Path |
| CPF | Cost Plus Fee |
| CPI | Cost Performance Index |
| CPM | Critical Path Method |
| CPS | Certification Practice Statement |
| CRL | Certificate Revocation List |
| CSA | Computer Security Act |
| CSP | Cryptographic Service Provider |
| CSRA | Critical Security Requirement Areas |
| CSSM | Common Security Services Manager |
| CTO | Chief Technology Officer |
| CV | Compliance Validation/Cost Variance |
| CVE | Common Vulnerability and Exposures |
| CVI | Compliance Validation Inspection |
| CVSD | Continuously Variable Slope Detection |
| CVSS | Common Vulnerability Scoring System |
| CWBS | Contract Work Breakdown Structure |
| CWE | Common Weakness Enumeration |
| DAA | Designated Approving Authority |
| DAC | Discretionary Access Control |
| DAP | Directory Access Protocol |
| DD | Data Date |
| DER | Distinguished Encoding Rules |
| DES | Data Encryption Standard |
| DHCP | Dynamic Host Control Protocol |
| DIT | Directory Information Tree |
| DMS | Defense Messaging System |
| DMZ | Demilitarized Zone |
| DN | Distinguished Name |
| DNS | Domain Name Server |
| DNSSEC | Domain Name System Security |
| DOS | Denial of Service |
| DSA | Directory Service Agents |
| DU | Duration |
| EAC | Estimate at Completion |
| EAL | Evaluation Assurance Level |
| ECAs | External Certificate Authorities |
| EF | Early Finish Date |
| EKMS | Electronic Key Management System |
| EMV | Expected Monetary Value |
| ESM | Encapsulating Security Management |
| ES | Early Start Date |
| ESP | Encapsulating Security Payload |
| ETC | Estimate to Complete |
| EUT | End User Terminal |
| EV | Expected Value/Earned Value |
| FedCIRC | Federal Computer Incident Response Center |
| FF | Finish-to-Finish/Free Float |
| FFP | Firm-Fixed-Price |
| FIPS | Federal Information Processing Standards |
| FIRST | Forum of Incident Response and Security Team |
| FISMA | Federal Information Processing Standards |
| FMEA | Failure Mode and Effect Analysis |
| FPIF | Fixed-Price-Incentive-Fee |
| FrSIRT | French Security Incident Response Team |
| FS | Finish-to-Start |
| FSRS | Functional Security Requirements for Specification |
| FTP | File Transfer Protocol |
| FW | Firewall |
| GSAKMP | Group Service Association Key Management Protocol |
| GUI | Graphical User Interface |
| GULS | General Upper Layer Security |
| HAG | High Assurance Guard |
| HF | High Frequency |
| HTML | Hyper Text Markup Language |
| HTTP | Hyper Text Transfer Protocol |
| I&A | Identification and Authentication |
| IA | Information Assurance |
| IAM | INFOSEC Assessment Methodology |
| IATF | Information Assurance Technical Framework |
| IBAC | Identity Based Access Control |
| IC | Intelligence Community |
| ICMP | Internet Control Message Protocol |
| ICRLA | Indirect Certificate Revocation List Authority |
| ID | Identifier |
| IDPS | Intrusion Detection and Prevention System |
| IDS | Intrusion Detection System |
| IDUP | Independent Data Unit Protection |
| IEEE | Institute of Electrical and Electronics Engineers |
| IEM | INFOSEC Evaluation Methodology |
| IETF | Internet Engineering Task Force |
| IFB | Invitation for Bid |
| IIS | Internet Information Server |
| IKE | Internet Key Exchange |
| ILS | Integrated Logistics Support |
| IMAP | Internet Mail Access Protocol |
| INE | Inline Network Encryptor |
| INFOSEC | Information Security |
| IP | Internet Protocol |
| IPN | Information Protection Network |
| IPS | Intrusion Prevention System |
| IPSec | Internet Protocol Security |
| IPX | Internet Packet Exchange |
| IR | Infrared |
| IS | Information Systems |
| ISAKMP | Internet Security Association and Key Management Protocol |
| ISDN | Integrated Services Digital Network |
| ISO | International Organization for Standardization |
| ISSAF | Information System Security Assessment Framework |
| ISSO | Information Systems Security Organization |
| IT | Information Technology |
| ITL | Information Technology Laboratory |
| IW | Information Warfare |
| KMI | Key Management Infrastructure |
| LAN | Local Area Network |
| LDAP | Lightweight Directory Access Protocol |
| LDM/KP | Local Management Device/Key Processor |
| LF | Late Finish Date |
| LOE | Level of Effort |
| LPD | Low Probability of Detection |
| LPI | Low Probability of Intercept |
| LRA | Local Registration Authority |
| LS | Late Start Date |
| MAC | Mandatory Access Control |
| MAN | Metropolitan Area Network |
| MD5 | Message Digest 5 |
| MILS | Multiple, Independent Security Levels |
| MIME | Multipurpose Internet Mail Extension |
| MSN | Mission Needs Statement |
| MoE | Measure of Effectiveness |
| MSP | Message Security Protocol |
| MTA | Message Transfer Protocol |
| MTS | Message Transfer System |
| NAT | Network Address Translation |
| NES | Network Encryption System |
| NIC | Network Interface Card |
| NIS | Network Information System |
| NIPC | National Infrastructure Protection Center |
| NIST | National Institute of Standards and Technology |
| NOS | Network Operating System |
| NSA | Network Security Agency |
| NSF | Network Security Framework |
| NVD | National Vulnerability Database |
| OBS | Organizational Breakdown Structure |
| OD | Original Duration |
| OIG | Office of Inspector General |
| OMB | Office of Management and Budget |
| OPSEC | Operational Security |
| ORD | Operational Requirements Documents |
| OS | Operating System |
| OSI | Open Systems Interconnection |
| OSSTMM | Open Source Security Testing Methodology Manual |
| OWASP | Open Web Application Security Project |
| P2P | Peer-to-Peer |
| PAA | Policy Approving Authority |
| PBX | Private Branch Exchange |
| PC | Percent Complete |
| PCA | Policy Creation Authority |
| PCI | Protocol Control Information |
| PDA | Personal Digital Assistant |
| PDM | Precedence Diagramming Method |
| PERL | Practical Extraction and Reporting Language |
| PF | Planned Finish Date |
| PGP | Pretty Good Privacy |
| PII | Personally Identifiable Information |
| PIN | Personal Identification Number |
| PKCS | Public Key Cryptographic Standards |
| PKI | Public Key Infrastructure |
| PM | Project Manager/Project Management |
| PMA | Policy Management Authority |
| PMBOK | Project Management Body of Knowledge |
| PMIS | Project Management Information System |
| PMO | Project Management Office |
| PMP | Project Management Professional |
| PPP | Point-to-Point Protocol |
| PS | Planned Start Date |
| PSTN | Public Switched Telephone Network |
| PSWBS | Project Summary Work Breakdown Structure |
| PV | Planned Value |
| QA | Quality Assurance |
| QC | Quality Control |
| QOS | Quality of Service |
| RADIUS | Remote Access Dial In User Service |
| RAM | Responsibility Assignment Matrix |
| RBAC | Rule Based Access Control |
| RBR | Rule-Based Reasoning |
| RBS | Resource Breakdown Structure/Risk Breakdown Structure |
| RD | Remaining Duration |
| RFC | Request for Comment |
| RFP | Request for Proposal |
| RFQ | Request for Quotation |
| ROE | Rules of Engagement |
| RTM | Requirements Traceability Matrix |
| S/MIME | Secure/Multipurpose Internet Mail Extension |
| SCADA | Supervisory Control and Data Acquisition |
| SCAP | Security Content Automation Protocol |
| SDD | Secure Data Device |
| SDE | Secure Data Exchange |
| SDLC | System Development Life Cycle |
| SET | Secure Electronic Transaction |
| SF | Scheduled Finish Date/Start to Finish |
| SFTP | Secure File Transfer Protocol |
| SHA | Secure Hashing Algorithm |
| SID | System Identfication |
| SIP | Session Initiation Protocol |
| SKM | Symmetric Key Management |
| SLA | Service Level Agreements |
| SMB | Server Message Block |
| SME | Subject Matter Expert |
| SMI | Security Management Infrastructure |
| SMIB | Security Management Information Base |
| SMTP | Simple Mail Transfer Protocol |
| SNMP | Simple Network Management Protocol |
| SOW | Statement of Work |
| SPG | Security Program Group |
| SPI | Schedule Performance Index |
| SS | Scheduled Start Date/Start to Start |
| SSA | System Security Administrator |
| SSAA | System Security Authorization Agreement |
| SSH | Secure Shell |
| SSID | Service Set Identifier |
| SSL | Secure Sockets Layer |
| SSN | Social Security Number |
| STE | Security Test and Evaluation |
| SV | Schedule Variance |
| SWOT | Strengths, Weaknesses, Opportunities, and Threats |
| TC | Target Completion Date |
| TCB | Trusted Computing Base |
| TCP | Transmission Control Protocol |
| TCP/IP | Transmission Control Protocol/Internet Protocol |
| TDMA | Time Division Multiple Access |
| TF | Target Finish Date/Total Float |
| TFTP | Trivial File Transfer Protocol |
| TLS | Transport Layer Security |
| TM | Time and Material |
| TOE | Target of Evaluation |
| TPEP | Trust Product Evaluation Program |
| TQM | Total Quality Management |
| TS | Target Start Date |
| TTP | Trusted Third Party |
| UDP | User Datagram Protocol |
| URL | Uniform Resource Locator |
| USB | Universal Serial Bus |
| VE | Value Engineering |
| VM | Virtual Machine |
| VoIP | Voice over Internet Protocol |
| VPN | Virtual Private Network |
| WAN | Wide Area Network |
| WBS | Work Breakdown Structure |
| WEP | Wired Equivalent Privacy |
| WIDPS | Wireless Intrusion Detection and Prevention System |
| WIFI | Wireless Fidelity |
| WLAN | Wireless Local Area Network |
| WPA | Wi-Fi Protected Access |
| WVE | Wireless Vulnerabilities and Exploits |
| XML | Extensible Markup Language |