Notes on living, reading, learning, and building.

Understanding EncryptedSharedPreferences: Secure Storage on Android July 1, 2021

A brief look at how EncryptedSharedPreferences in the AndroidX Security library works and how to securely store sensitive key-value data.

How logcat Works: Reading Android Logs June 17, 2021

A source-level breakdown of Android logcat's read flow, covering the logd daemon, socket communication, and transport mechanisms.

WeChat xlog Encryption Analysis: TEA + ECDH Key Exchange May 28, 2021

An analysis of the encryption mechanism in xlog, part of WeChat's Mars component, where TEA symmetric encryption works with ECDH key exchange to secure log transmission.

TCP Packet Coalescing: Root Cause and Solutions May 22, 2021

Clarifying a common misconception: packet coalescing is not a TCP bug, but an application-layer protocol design issue. A deep dive into how byte streams and message boundaries are defined.

On Function Symbol Export Issues in GCC Compilation April 10, 2021

Notes on an undefined reference error encountered during Android compilation, regarding GCC visibility attributes and symbol export.

Configuring SSH Access for Multiple Git Repositories November 11, 2020

Quickly configure SSH keys for multiple Git repositories in a new environment for secure and convenient multi-repo access.

HTTP/HTTPS: The Essence of Secure Web Transmission October 22, 2020

From HTTP plaintext transmission to HTTPS encrypted communication, a brief look at how the TLS/SSL protocol protects web communication.

A Wild Pointer August 23, 2020

TLS Protocol Explained: From Handshake to Encrypted Transmission February 2, 2020

An overview of the TLS protocol framework, its evolution from TLS 1.2 to TLS 1.3, the handshake process, and cryptographic security mechanisms.

Inspectional Reading January 6, 2020