-STEP 01-
PART 01 Information Security Overview
SECTION 01 Concept of Information Security Management

PART 02 Cryptography
SECTION 01 Cryptography Overview
SECTION 02 Symmetric Key Cryptography
SECTION 03 Asymmetric Key Cryptography
SECTION 04 Hash Functions and Applications
SECTION 05 Electronic Signatures and PKI
SECTION 06 Keys and Random Numbers

PART 03 Access Control
SECTION 01 Access Control Overview
SECTION 02 User Authentication
SECTION 03 Access Control Security Model
SECTION 04 Access Control Security Threats and Countermeasures

PART 04 SYSTEM SECURITY
SECTION 01 Secure Operating System
SECTION 02 Client Security
SECTION 03 Windows Server Security
SECTION 04 Unix/Linux Server Security
SECTION 05 Server Security Management
SECTION 06 Various System Security Threats and Countermeasures
SECTION 07 Latest Security Topics

PART 05 NETWORK SECURITY
SECTION 01 Network Overview
SECTION 02 TCP/IP
SECTION 03 ROUTING
SECTION 04 Understanding Network Equipment
SECTION 05 Wireless Communication Security
SECTION 06 NETWORK MANAGEMENT
SECTION 07 Utilizing Network-Based Programs
SECTION 08 Understanding Network-Based Attacks
SECTION 09 IDS/IPS
SECTION 10 Firewall
SECTION 11 VPN
SECTION 12: Latest Network Security Trends

PART 06 APPLICATION SECURITY
SECTION 01 FTP Security
SECTION 02 Email Security
SECTION 03 Web Security
SECTION 04 DHCP and DNS Security
SECTION 05 DATABASE SECURITY
SECTION 06 E-Commerce Security
SECTION 07: Breach Incident Response (Digital Forensics)
SECTION 08 Various Application Security Threats and Countermeasures

PART 07 Information Security Management and Regulations
SECTION 01 Establishing an Information Security Governance and Management System
SECTION 02 Information Security Risk Management
SECTION 03 BCP/DRP
SECTION 04 Information Security Certification System
SECTION 05 Information Protection-Related Laws

-STEP 02-
PART 01 Information Security Overview
SECTION 01 Concept of Information Security Management

PART 02 Cryptography
SECTION 01 Cryptography Overview
SECTION 02 Symmetric Key Cryptography
SECTION 03 Asymmetric Key Cryptography
SECTION 04 Electronic Signatures and PKI
SECTION 05 Keys and Random Numbers

PART 03 Access Control
SECTION 01 User Authentication
SECTION 02 Access Control Security Model
SECTION 03 Access Control Security Threats and Countermeasures

PART 04 SYSTEM SECURITY
SECTION 01 Secure Operating System
SECTION 02 Client Security
SECTION 03 Windows Server Security
SECTION 04 Unix/Linux Server Security
SECTION 05 Server Security Management
SECTION 06 Latest Security Topics

PART 05 NETWORK SECURITY
SECTION 01 Network Overview
SECTION 02 ROUTING
SECTION 03 Understanding Network Equipment
SECTION 04 Wireless Communication Security
SECTION 05 NETWORK MANAGEMENT
SECTION 06 Utilizing Network-Based Programs
SECTION 07 IDS/IPS
SECTION 08 Firewall
SECTION 09 VPN
SECTION 10: Latest Network Security Trends

PART 06 APPLICATION SECURITY
SECTION 01 FTP Security
SECTION 02 Email Security
SECTION 03 Web Security
SECTION 04 DHCP and DNS Security
SECTION 05 DATABASE SECURITY
SECTION 06 E-Commerce Security
SECTION 07: Breach Incident Response (Digital Forensics)
SECTION 08 Various Application Security Threats and Countermeasures

PART 07 Information Security Management and Regulations
SECTION 01 Establishing an Information Security Governance and Management System
SECTION 02 Information Security Risk Management
SECTION 03 BCP/DRP
SECTION 04 Information Security Certification System
SECTION 05 Information Protection-Related Laws

Appendix: Latest 2-year past exam questions

2024 National Civil Service Level 7 Information Security Theory
2024 National Civil Service Exam Level 9 Information Security Theory
2024 Local Government and Education Office 9th Grade Information Protection Theory
2024 Military Service 7th Grade Information Protection Theory
2024 Military Service 9th Grade Information Protection Theory
2024 Military Cyber ​​​​Level 7 Network Security
2024 Military Cyber ​​​​Level 9 Network Security
2024 National Civil Service 9th Grade Network Security
2024 National Civil Service Grade 9 Information System Security
2024 Korea Coast Guard Network Security
2024 Korea Coast Guard Information System Security
2025 National Civil Service 7th Grade Information Protection Theory
2025 National Civil Service 9th Grade Information Security Theory
2025 Local Government and Education Office 9th Grade Information Protection Theory
2025 Military Service 7th Grade Information Protection Theory
2025 Military Service 9th Grade Information Protection Theory
2025 Military Cyber ​​​​Level 7 Network Security
2025 Military Cyber ​​​​Level 9 Network Security
2025 National Civil Service Grade 9 Network Security
2025 National Civil Service Grade 9 Information System Security

Appendix: Answers and explanations for the latest two-year exam questions

2024 National Civil Service Level 7 Information Security Theory
2024 National Civil Service Exam Level 9 Information Security Theory
2024 Local Government and Education Office 9th Grade Information Protection Theory
2024 Military Service 7th Grade Information Protection Theory
2024 Military Service 9th Grade Information Protection Theory
2024 Military Cyber ​​​​Level 7 Network Security
2024 Military Cyber ​​​​Level 9 Network Security
2024 National Civil Service 9th Grade Network Security
2024 National Civil Service Grade 9 Information System Security
2024 Korea Coast Guard Network Security
2024 Korea Coast Guard Information System Security
2025 National Civil Service 7th Grade Information Protection Theory
2025 National Civil Service 9th Grade Information Security Theory
2025 Local Government and Education Office 9th Grade Information Protection Theory
2025 Military Service 7th Grade Information Protection Theory
2025 Military Service 9th Grade Information Protection Theory
2025 Military Cyber ​​​​Level 7 Network Security
2025 Military Cyber ​​​​Level 9 Network Security
2025 National Civil Service Grade 9 Network Security
2025 National Civil Service Grade 9 Information System Security

· Includes the latest past exam questions
Information security theory was first included in the civil service examination in 2014.
For students preparing for exams, past exam questions are more crucial than ever to help them understand the direction of their studies and the scope of the exam.
Accordingly, this textbook includes all the latest past exam questions.

Book Structure and Use

· Provides the latest two-year exam questions
Separate from the unit-by-unit problems, the latest past exam questions were provided in mock exam format.
We aim to help you understand the types of questions asked by each implementing agency.

· Integrate problems and explanations
We have carefully selected problems and organized them by unit to enhance the practical sense through problem solving.

I would like to express my deepest gratitude to the CEO and staff of Gian Edu Publishing for their assistance in publishing this textbook.
Also, I would like to express my gratitude to everyone who helped me with the proofreading.