Mastering Android Privacy & Security

Learn about Android manifest, normal versus runtime permissions, and how max SDK version affects storage permission. See a demo of requesting camera permission, handling denial, and degrading gracefully.

Explore runtime location permissions, request foreground first, handle approximate versus precise location on Android 12, and request both permissions in a single request to upgrade to precise and background access.

Explore how apps should handle data in a privacy friendly way, building on permissions and location privacy to design data access that protects user privacy.

Compare accounts, sim status, subscriptions, and advertising identifiers, and distinguish app set ID from Firebase ID for crash, performance, cross-device installs, abuse detection, and per-device state.

Audit private user data access with a practical demo, discuss data safety and data collection and sharing guidelines, and explore privacy facing UI elements added in Android 12.

Update the data safety section in the Google Play Console to declare data types such as approximate location, personal info, photos, and crash/diagnostics data, and explain collection and processing.

Android 12 introduces three private user interface elements to inform users and control access to sensitive resources, including the privacy dashboard, status bar indicators, and quick settings toggles.

Explore how Android 12 privacy dashboard shows permissions usage, including location, camera, and microphone, with a timeline, data access rationale, attribution tags, and indicators that reveal usage.

Discover how the privacy sandbox enforces a secure app sandbox with process isolation for runtime enabled SDKs, introducing privacy preserving APIs and a separate SDK distribution model.

Explore how Android permissions guard access to system resources, from hidden and signature-protected APIs to runtime requests and a per-app privacy dashboard.

Explore how Android IPC uses binder and messenger with RPC over a Linux driver to enable secure inter-process communication, protected by manifest permissions and explicit intents.

Explore hardware backed security in Android, including trusted execution environment and secure element. Learn how Android Keystore enables authentication via PIN, pattern, or biometrics and supports DRM and identity credentials.

Highlight secure elements as hardware backed storage with their own cpu and tamper resistant components. Discuss strongbox keymaster, key attestation, and android ready se for hardware backed cryptographic keys.

Explore symmetric cryptography by examining confusion and diffusion, the avalanche effect, and how DES and AES use substitution, transposition, and permutation with stream and block ciphers.

Explain cipher block chaining (cbc) as a block mode where each block depends on the previous ciphertext and an initialization vector, providing confidentiality and authentication, though it sacrifices speed.

Apply counter mode (CTR) for AES encryption and IP security, using a counter input to xor with plaintext, enabling parallelized computation, real-time processing, and pre-processing while keeping counters in sync.

Explore how the Data Encryption Standard encrypts a 64-bit plaintext with a 64-bit key through 16 rounds of a Feistel structure, subkey generation, and the mangler, S-boxes, and permutations.

Demonstrates data encryption standard on Android, showing encryption and decryption using ECB, CBC, CFB, OFB, and CTR modes with PKCS5 padding and initialization vector handling.

Examine how the Data Encryption Standard can be cracked, reviewing linear cryptanalysis and differential cryptanalysis, s-box behavior, avalanche effect, and the impractical need for massive plaintext-ciphertext pairs.

Master the advanced encryption standard, a 128-bit block cipher with 10–14 rounds and variable key sizes, using substitution, shift rows, and mixed columns to achieve confusion and diffusion.