How to Build a Secure CLI Password Manager in Python Using Fernet Encryption

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A tutorial published on DEV Community walks developers through creating a command-line password manager using Python 3.11 and the cryptography library. The project uses Fernet symmetric encryption to ensure stored credentials remain confidential and tamper-evident, even if the underlying file is stolen. Developers are guided to build a PasswordManager class with methods for generating keys, adding passwords, and retrieving them securely. The setup requires two libraries — cryptography and pyperclip — the latter enabling automatic clipboard copying for convenience. The tutorial emphasizes a security-first mindset, contrasting this approach with risky practices like storing passwords in plain text or browser storage.

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Server-Side WebAssembly Gains Ground as Lightweight Alternative to Containers

WebAssembly, traditionally a browser-based binary format, is increasingly being deployed on server infrastructure through a standard called WASI, which allows Wasm programs to safely interact with host system resources. Unlike traditional containers that bundle operating system files and can occupy hundreds of megabytes, WebAssembly binaries contain only compiled application logic, often weighing just a few megabytes and starting in under a millisecond. A software engineer experimenting with Rust-based backend services on a server-side Wasm runtime found the cold-start performance significantly better than conventional approaches, enabling hundreds of isolated tasks on modest hardware. However, the ecosystem remains immature, with debugging tools, database drivers, and telemetry libraries still being adapted for the Wasm environment. Experts suggest WebAssembly is unlikely to replace containers across all enterprise workloads but shows strong promise for high-density, low-latency, and event-driven use cases.

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ProgrammingDEV Community ·

Mozilla Contributor Fixes 5-Year-Old Firefox Bug That Trapped Amazon in Top Sites

A Mozilla open-source contributor has resolved a long-standing Firefox bug, first reported on Bugzilla, where users were unable to remove Amazon.com from the browser's New Tab Top Sites grid despite repeated attempts. The bug stemmed from how Firefox categorizes Top Sites — distinguishing between visited history, pinned sites, and default curated tiles — with Amazon persisting as a default entry regardless of user action. The contributor initially proposed blocking the URL upon deletion, but Mozilla engineers pushed back, noting this would silently alter user settings without clear consent. Guided by a second reviewer, the contributor identified the root cause through targeted logging and implemented a more precise fix that respects user intent. The resolution was submitted as part of DEV Community's Summer Bug Smash challenge, powered by Sentry.

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ProgrammingDEV Community ·

CamBridge streams Mac webcam to iOS Simulator for real camera testing

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ProgrammingDEV Community ·

A Practical 90-Day Reliability Roadmap for Newly Formed SRE Teams

Site reliability engineer Dr. Samson Tanimawo has outlined a structured 90-day plan designed to help new SRE teams establish credibility and build lasting reliability practices. The plan begins with observation — studying existing systems, reviewing post-mortems, and identifying the top five reliability problems ranked by engineering time lost per week. Early weeks focus on quick, visible wins such as removing flaky alerts or automating repetitive runbooks, while avoiding large overhauls like rewriting deployment pipelines. Mid-phase work introduces foundational elements including SLOs, error budget dashboards, and a lightweight weekly reliability review. The final phase aims to institutionalize ongoing programs — such as post-mortem tracking and quarterly leadership reviews — so reliability work continues even when team members are unavailable.

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