Developing security for mobile apps on iOS
CITY & GUILDS LIMITED
Vocational
This unit focuses on developing security for iOS mobile apps, covering secure coding in Objective C, network and data security, and application hardening. Learners will understand how to protect apps from common vulnerabilities and threats.
14
Learning Outcomes
30
Assessment Guidance
30
Key Skills
14
Key Terms
43
Assessment Criteria
Assessment criteria
City & Guilds Level 3 Certificate in ICT Systems and Principles
City & Guilds Level 3 Diploma in ICT Systems and Principles for IT Professionals
City & Guilds Level 3 Diploma in ICT Professional Competence
City & Guilds Level 2 Diploma in ICT Systems and Principles for IT Professionals
City & Guilds Level 2 Diploma in ICT Systems Support
City & Guilds Level 2 Certificate in ICT Systems Support
City & Guilds Level 3 Diploma in ICT Systems Support
City & Guilds Level 4 Diploma For ICT Professionals (Systems and Principles)
City & Guilds Level 2 Diploma in ICT Professional Competence
Topic Overview
The City & Guilds Level 3 Diploma in ICT Systems Support is a vocational qualification designed to equip students with the practical skills and theoretical knowledge needed to support and maintain ICT systems in a professional environment. This diploma covers a broad range of topics, including hardware installation and configuration, software troubleshooting, network fundamentals, and customer service skills. It is ideal for those aspiring to become IT support technicians, helpdesk analysts, or network support engineers, providing a solid foundation for entry-level roles in the ICT industry.
Throughout the course, students engage with real-world scenarios, learning how to diagnose and resolve common hardware and software issues, set up and maintain networks, and communicate effectively with end-users. The qualification emphasizes hands-on experience, with assessments often involving practical tasks such as building a PC, configuring a router, or troubleshooting a faulty system. By the end of the diploma, students should be confident in managing ICT systems, ensuring minimal downtime, and delivering high-quality support to users.
This diploma fits into the wider subject of Computer Science by bridging the gap between theoretical concepts and practical application. While Computer Science degrees focus on algorithms, programming, and computational theory, this vocational qualification prioritizes the operational aspects of IT—how to keep systems running smoothly. It is particularly valuable for students who prefer a more applied approach to learning and want to enter the workforce quickly with recognized industry credentials.
Key Concepts
Core ideas you must understand for this topic
- →Hardware components and their functions: Understand the role of CPUs, RAM, storage devices, motherboards, and power supplies, and how to select, install, and upgrade them for different user requirements.
- →Operating system installation and configuration: Learn to install and configure Windows and Linux operating systems, manage user accounts, set up permissions, and perform system updates and backups.
- →Network fundamentals: Grasp IP addressing, subnetting, DNS, DHCP, and the OSI model. Be able to set up a small local area network (LAN) using switches, routers, and cabling.
- →Troubleshooting methodology: Apply a systematic approach to diagnose and resolve hardware, software, and network issues, including using diagnostic tools, checking logs, and testing components.
- →Customer service and communication: Develop skills to interact professionally with users, manage support tickets, escalate issues appropriately, and document solutions clearly.
Learning Objectives
What you need to know and understand
- Understand application security, Understand Objective C coding, Understanding application security features, Understand network security, Understand data security, Understand application hardening
- Understand application security, Understand Objective C coding, Understanding application security features, Understand network security, Understand data security, Understand application hardening
- Understand application security, Understand Objective C coding, Understanding application security features, Understand network security, Understand data security, Understand application hardening
- Understand application security, Understand Objective C coding, Understanding application security features, Understand network security, Understand data security, Understand application hardening
- Explain the principles of application security in the context of iOS development.
- Apply secure coding practices in Objective-C to prevent common vulnerabilities.
- Implement iOS security features such as Keychain, Touch ID, and App Sandbox.
- Evaluate network security measures for iOS apps, including TLS and certificate pinning.
- Assess data security strategies for protecting sensitive data at rest and in transit.
- Apply application hardening techniques to mitigate reverse engineering and tampering.
- Understand application security, Understand Objective C coding, Understanding application security features, Understand network security, Understand data security, Understand application hardening
- Understand application security, Understand Objective C coding, Understanding application security features, Understand network security, Understand data security, Understand application hardening
- Understand application security, Understand Objective C coding, Understanding application security features, Understand network security, Understand data security, Understand application hardening
- Understand application security, Understand Objective C coding, Understanding application security features, Understand network security, Understand data security, Understand application hardening
Assessment Criteria
Key criteria assessors look for in your portfolio
- Implements secure coding practices in Objective C.
- Applies encryption and secure data storage techniques.
- Configures network security protocols correctly.
- Demonstrates application hardening methods.
- Identifies and mitigates common iOS vulnerabilities.
- Explain key iOS security features.
- Describe secure coding in Objective C.
- Outline network and data security measures.
- Discuss application hardening techniques.
- Explains key iOS security features (e.g., sandboxing, code signing).
- Identifies common vulnerabilities in Objective C code.
- Describes network security measures (e.g., SSL/TLS).
- Applies data encryption and secure storage practices.
- Explain key iOS security features like Keychain and sandboxing.
- Describe secure coding practices in Objective-C to prevent vulnerabilities.
- Identify methods to secure network communications (e.g., TLS).
- Outline data protection strategies including encryption at rest.
- Discuss application hardening techniques such as code obfuscation.
- Award credit for demonstrating understanding of the CIA triad (Confidentiality, Integrity, Availability) in relation to mobile app security.
- Award credit for identifying and explaining common Objective-C vulnerabilities such as buffer overflows, format string issues, and improper memory management.
- Award credit for correctly describing the purpose and implementation of iOS security features like Keychain Services, Touch ID/Face ID, and App Transport Security.
- Award credit for evaluating the use of HTTPS, TLS, and certificate pinning to secure network communications.
- Award credit for explaining data protection techniques including encryption, secure storage, and data minimization.
- Award credit for describing application hardening methods such as code obfuscation, jailbreak detection, and anti-debugging techniques.
- Identifies common iOS security vulnerabilities (e.g., injection, insecure data storage).
- Implements secure coding practices in Objective C.
- Configures network security measures (e.g., SSL/TLS, certificate pinning).
- Applies application hardening techniques (e.g., code obfuscation, jailbreak detection).
- Understands application security principles for iOS.
- Applies Objective C coding practices that enhance security.
- Implements network security features like SSL pinning.
- Uses data encryption and secure storage methods.
- Applies app hardening techniques to prevent reverse engineering.
- Understand common iOS security threats.
- Implement secure coding practices in Objective C.
- Configure network security features.
- Apply data encryption and secure storage.
- Harden apps against reverse engineering.
- Identifies key iOS security features like Keychain and sandboxing.
- Explains secure coding practices in Objective-C to prevent buffer overflows and injection attacks.
- Describes network security measures such as TLS and certificate pinning.
- Outlines data protection methods including encryption and secure storage.
- Discusses application hardening techniques like code obfuscation and jailbreak detection.
Assessment Guidance
Guidance for achieving higher grades
- 💡Familiarise yourself with OWASP Mobile Top 10.
- 💡Practice using Xcode security features like Keychain.
- 💡Always consider the principle of least privilege.
- 💡Use Apple's security guidelines as reference.
- 💡Provide code examples for secure practices.
- 💡Highlight common vulnerabilities like SQL injection.
- 💡Use specific iOS terminology (e.g., Keychain, Touch ID).
- 💡Provide code examples to illustrate security measures.
- 💡Discuss both prevention and detection techniques.
- 💡Use specific iOS terminology like 'Keychain' and 'App Transport Security'.
- 💡Provide examples of common vulnerabilities (e.g., buffer overflow).
- 💡Relate security features to real-world attack scenarios.
- 💡Familiarize yourself with the Apple Security Guide and OWASP Mobile Security Project for best practices.
- 💡Practice writing secure Objective-C code, paying attention to memory management and input validation.
- 💡Understand the role of the iOS Keychain and how to use it for storing sensitive data.
- 💡Be prepared to discuss real-world security breaches and how they could have been prevented.
- 💡Use the command verbs in the learning objectives to structure your answers (e.g., 'explain', 'apply', 'evaluate').
- 💡In assignments, always provide specific examples and justifications for your security choices.
- 💡Familiarise yourself with Apple's security guidelines and APIs.
- 💡Practice using tools like Xcode's security analyser.
- 💡Understand the principle of least privilege for permissions.
- 💡Familiarise yourself with iOS security APIs like Keychain.
- 💡Understand common vulnerabilities like injection and insecure data storage.
- 💡Practice secure coding in Objective C.
- 💡Learn key iOS security APIs (Keychain, SSL).
- 💡Practice code review for security flaws.
- 💡Understand OWASP mobile top 10 risks.
- 💡Focus on practical examples of vulnerabilities and their mitigations.
- 💡Remember to mention Apple's App Transport Security (ATS) for network security.
- 💡Use correct terminology like 'sandboxing' and 'keychain'.
- 💡When answering exam questions, always use the correct technical terminology. For example, instead of saying 'the computer is slow,' specify 'the CPU is under high load due to multiple background processes.' This shows depth of knowledge and earns higher marks.
- 💡In practical assessments, follow a logical troubleshooting process: identify the problem, gather information, test possible causes, and implement a solution. Document each step clearly, as examiners look for methodical thinking and evidence of problem-solving skills.
- 💡For network-related questions, draw diagrams to illustrate your answer. A simple sketch of a LAN with labelled devices (router, switch, PC) and IP addresses can clarify your explanation and demonstrate understanding of network topology.
Common Mistakes
Common errors to avoid in your coursework
- Hardcoding sensitive data like API keys.
- Neglecting to validate input properly.
- Using outdated or insecure network protocols.
- Ignoring input validation vulnerabilities.
- Misusing encryption APIs.
- Overlooking secure data storage.
- Confusing symmetric and asymmetric encryption.
- Neglecting to secure data at rest as well as in transit.
- Overlooking the importance of input validation.
- Confusing iOS sandbox with Android sandbox.
- Overlooking the importance of secure data storage.
- Assuming HTTPS alone ensures complete network security.
- Assuming that iOS apps are inherently secure without implementing additional security measures.
- Neglecting to validate input and sanitize data, leading to injection attacks.
- Storing sensitive data in plain text or in insecure locations like NSUserDefaults.
- Overlooking the importance of secure network connections and using HTTP instead of HTTPS.
- Failing to implement proper error handling that could expose sensitive information.
- Not considering the implications of jailbroken devices and the need for jailbreak detection.
- Storing sensitive data in plaintext or UserDefaults.
- Ignoring input validation, leading to injection attacks.
- Overlooking proper session management and token handling.
- Storing sensitive data in plaintext or UserDefaults.
- Ignoring certificate validation in network requests.
- Failing to obfuscate code or use anti-tampering measures.
- Storing sensitive data in plaintext.
- Ignoring certificate pinning for network calls.
- Failing to validate input properly.
- Confusing Objective-C with Swift security features.
- Overlooking the importance of secure data storage on device.
- Assuming network traffic is automatically secure without implementing TLS.
- Misconception: 'All ICT support is just fixing broken computers.' Correction: While hardware repair is part of the role, ICT support also involves software troubleshooting, network configuration, security management, and user training. The diploma covers a wide range of skills beyond basic repairs.
- Misconception: 'You don't need to understand networking for ICT support.' Correction: Networking is a core component of the diploma. Many support issues involve connectivity problems, so understanding IP addresses, routers, and switches is essential for diagnosing and resolving network-related faults.
- Misconception: 'Theoretical knowledge is not important; only practical skills matter.' Correction: The diploma requires both. For example, knowing the OSI model helps you systematically troubleshoot network issues, and understanding file permissions is crucial for configuring secure systems. Theory supports effective practice.
Frequently Asked Questions
Common questions students ask about this topic
Pass / Merit / Distinction Evidence Checklist
How your portfolio evidence is graded for CITY & GUILDS LIMITED Developing security for mobile apps on iOS
Every vocational unit is marked against named criteria rather than an exam percentage. Your tutor's brief lists the exact codes for this unit — here is what each band is asking you to do.
Pass (P)
Demonstrate baseline knowledge, accurate terminology, and core practical application.
Merit (M)
Provide detailed analysis, structured explanations, and clear workplace reasoning.
Distinction (D)
Deliver thorough evaluation, original problem solving, and fully justified recommendations.
Before You Start
Prior knowledge that will help with this topic
- •Basic understanding of computer hardware: Familiarity with common components like CPU, RAM, and hard drives will help you grasp more advanced concepts quickly.
- •Fundamental IT literacy: Comfort with using operating systems (Windows/Linux), navigating file systems, and installing software is assumed.
- •Basic mathematics: Understanding of binary, decimal, and hexadecimal numbering systems is useful for IP addressing and subnetting.
Coursework AI Review
Paste your assignment brief and check your draft against its P/M/D criteria
Key Terminology
Essential terms to know
- Understand application security, Understand Objective C coding, Understanding application security features, Understand network security, Understand data security, Understand application hardening
- Understand application security, Understand Objective C coding, Understanding application security features, Understand network security, Understand data security, Understand application hardening
- Understand application security, Understand Objective C coding, Understanding application security features, Understand network security, Understand data security, Understand application hardening
- Understand application security, Understand Objective C coding, Understanding application security features, Understand network security, Understand data security, Understand application hardening
- Application security fundamentals
- Secure coding in Objective-C
- iOS security features
- Network security
- Data security
- Application hardening
- Understand application security, Understand Objective C coding, Understanding application security features, Understand network security, Understand data security, Understand application hardening
- Understand application security, Understand Objective C coding, Understanding application security features, Understand network security, Understand data security, Understand application hardening
- Understand application security, Understand Objective C coding, Understanding application security features, Understand network security, Understand data security, Understand application hardening
- Understand application security, Understand Objective C coding, Understanding application security features, Understand network security, Understand data security, Understand application hardening
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