2026年7月9日

Security Headers Checker — 12-Header Audit, A+ to F Grade

Security Headers Checker: A+ to F Grade in 30 Seconds

By xiezixing 2026年7月9日

Audit HTTP response headers for OWASP security compliance. Paste raw headers from curl, DevTools, or CI — get a letter grade with copy-ready fixes for HSTS, CSP, X-Content-Type-Options, COOP/COEP/CORP, and nine more.

Title Case Converter — AP, Chicago, Wikipedia style rules

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Title Case Converter: When ‘The’ Stays Lowercase

By xiezixing 2026年7月9日

Editorial title casing is not a single transformation — it's a style decision. AP, Chicago, and Wikipedia each draw the function-word line differently.

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Reading the Genetic Code in All Six Frames

By xiezixing 2026年7月9日

A walkthrough of how six-frame translation, codon degeneracy, and stop-codon detection turn a raw DNA string into the protein you are actually looking for.

Bcrypt Generator - Why Your Password Hash Is the Wrong Defense

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Why Your Password Hash Is the Wrong Defense (and How Bcrypt Closes the Gap)

By xiezixing 2026年7月9日

Bcrypt has held the password-storage line for twenty-five years. Here is the algorithm, the cost knob, and the four things that fail when teams wire it in.

CSV Transformer — six declarative operations that replace most ad-hoc pandas scripts

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Six Operations That Replace Most of Your Ad-Hoc pandas Scripts

By xiezixing 2026年7月9日

The CSV Transformer at elysiatools.com — six declarative operations (rename, add_column, remove_column, convert_type, calculate, filter_values) that turn messy CSV cleanup into a JSON file the next person can read.

Poker Outs and Equity Simulator poster - why 8 clean outs beat 31 dirty outs

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Why 8 Clean Outs Beat 31 Dirty Outs (Poker Equity vs Rule of 4 and 2)

By xiezixing 2026年7月9日

The Rule of 4 and 2 is right — it just hides the dirty-outs problem. 17 clean outs vs 6 dirty on Ah Kh / Qh Jh 2c, with 60% equity vs the textbook 36%.