The following is a list of acronyms that appear on the CompTIA Security+ exam.
I've made a flashcard set on quizlet to go with these: https://quizlet.com/_919uvm?x=1jqt&i=2z4u5u
3DES - Triple Digital Encryption Standard
AAA - Authentication, Authorization, and Accounting
ABAC - Attribute-based Access Control
ACE - Access Control Entry
ACL - Access Control List
AES - Advanced Encryption Standard
AES256 - Advanced Encryption Standard 256bit
AH - Authentication Header
ALE - Annualized Loss Expectancy
AP - Access Point
API - Application Programming Interface
APT - Advanced Persistent Threat
ARO - Annualized Rate of Occurrence
ARP - Address Resolution Protocol
ASLR - Address Space Layout Randomization
ASP - Application Service Provider
AUP - Acceptable Use Policy
AV - AntiVirus
AV - Asset Value
BAC - Business Availability Center
BCP - Business Continuity Planning
BIA - Business Impact Analysis
BIOS - Basic Input/Output System
BPA - Business Partners Agreement
BPDU - Bridge Protocol Data Unit
BYOD - Bring Your Own Device
CA - Certificate Authority
CAC - Common Access Card
CAN - Controller Area Network
CAPTCHA - Completely Automated Public Turing Test to Tell Computers and Humans Apart
CAR - Corrective Action Report
CBC - Cipher Block Chaining
CCMP - Counter-Mode / CBC-Mac Protocol
CCTV - Closed Circuit Television
CER - Canonical Encoding Rules
CER - Certificate
CER - Cross-Over Error Rate
CERT - Computer Emergency Response Team
CFB - Cipher Feedback
CHAP - Challenge Handshake Authentication Protocol
CIO - Chief Information Officer
CIRT - Computer Incident Response Team
CMS - Content Management Systems
CoOP - Continuity of Operations Plan
COPE - Corporate Owned, Personally Enabled
CP - Contingency Planning
CRC - Cyclical Redundancy Check
CRL - Certificate Revocation List
CSIRT - Computer Security Incident Response Team
CSO - Chief Security Officer
CSP - Cloud Service Provider
CSR - Certificate Signing Request
CSRF - Cross-Site Request Forgery
CSU - Channel Service Unit
CTM - Counter-Mode
CTO - Chief Technology Officer
CTR - Counter
CYOD - Choose Your Own Device
DAC - Discretionary Access Control
DACL - Discretionary Access Control List
DBA - Database Administrator
DCL - Data Control Language
DDoS - Distributed Denial of Service
DEP - Data Execution Prevention
DER - Distinguished Encoding Rules
DES - Digital Encryption Standard
DFIR - Digital Forensics and Investigation Response
DHCP - Dynamic Host Configuration Protocol
DHE - Data-Handling Electronics
DHE - Diffie-Hellman Ephemeral
DIT - Directory Information Tree
DLL - Dynamic Link Library
DLP - Data Loss Prevention
DMZ - Dimilitarized Zone
DNAT - Destination Network Address Transaction
DNS - Domain Name Service/Server/System
DoS - Denial of Service
DRP - Disaster Recovery Plan
DSA - Digital Signature Algorithm
DSL - Digital Subscriber Line
DSU - Data Service Unit
EAP - Extensible Authentication Protocol
ECB - Electronic Code Book
ECC - Elliptical Curve Cryptography
ECDHE - Elliptical Curve Diffie-Hellman Ephemeral
ECDSA - Elliptical Curve Digital Signature Algorithm
EFS - Encrypted File System
EMI - Electromagnetic Interference
EMP - Electromagnetic Pulse
ERP - Enterprise Resource Planning
ESN - Electronic Serial Number
ESP - Encapsulated Security Payload
EF - Exposure Factor
FACL - File System Access Control List
FAR - False Acceptance Rate
FDE - Full Disk Encryption
FRR - False Rejection Rate
FTP - File Transfer Protocol
FTPS - Secured Filed Transfer Protocol
GCM - Galois Counter Mode
GPG - GNU Privacy Guard
GPO - Group Policy Object
GPS - Global Positioning Unit
GRE - Generic Routing Encapsulation
HA - High Availability
HDD - Hard Disk Drive
HIDS - Host-based Intrusion Detection System
HIPS - Host-based Intrusion Prevention System
HMAC - Hashed Message Authentication Code
HOTP - HMAC-based One-Time Password
HSM - Hardware Security Module
HTML - Hypertext Markup Language
HTTP - Hypertext Transfer Protocol
HTTPS - Hypertext Transfer Protocol over SSL/TLS
HVAC - Heating, Ventilation, and Air Conditioning
IaaS - Infrastructure as a Service
ICMP - Internet Control Message Protocol
ICS - Industrial Control Systems
ID - Identification
IDEA - International Data Encryption Algorithm
IDF - intermediate Distribution Frame
IDP - Identity Provider
IDS - Intrusion Detection System
IEEE - Institute of Electrical and Electronic Engineers