2025年は趣味開発環境の変化が大きかったので備忘録として残しておく。

前提:

• 趣味開発はほぼ毎日している
• 開発するのはコマンドラインツールやライブラリが多い
• 言語はほぼRust
• 開発はほぼAndroid上

This guide explains how to create, mount, and maintain a VHDX drive for use with WSL (Windows Subsystem for Linux).

• Windows 10/11 with WSL2 installed
• Administrative access
• PowerShell
• Sufficient disk space

The goal was to bypass WAF protection to access local resources.

app.re_ip = re.compile('\A(\d+)\.(\d+)\.(\d+)\.(\d+)\Z')

def valid_ip(ip):
 matches = app.re_ip.match(ip)

• CARTA HOLDINGS（旧VOYAGE GROUP）
  • 技術広報が新卒研修<Open AIハッカソン>をスパイしてみた - (2023/04/11)
  • @t_wadaに学ぶテスト駆動開発【CARTA 23新卒研修】 - (2023/04/19)
  • 【新卒研修】監修者@t_wadaと読む！プログラマが知るべき97のこと読書会 - (2024/04/09)
• Classi
  • 当たり前にリリースしていく ~ 新卒研修編 - (2021/05/20)
  • リモートワークのための質問力向上研修を実施しました - (2021/12/07)
  • Classi 2025年新卒エンジニア研修「そーだい塾」を開催しました - (2025/06/18)
• CyberZ

hi, i'm daniel. i'm a 16-year-old high school senior. in my free time, i hack billion dollar companies and build cool stuff.

about a month ago, a couple of friends and I found serious critical vulnerabilities on Mintlify, an AI documentation platform used by some of the top companies in the world.

i found a critical cross-site scripting vulnerability that, if abused, would let an attacker to inject malicious scripts into the documentation of numerous companies and steal credentials from users with a single link open.

(go read my friends' writeups (after this one))
how to hack discord, vercel, and more with one easy trick (eva)
Redacted by Counsel: A supply chain postmortem (MDL)

• Related Links: Link #1 Link #2 Link #3

The core principle behind extracting a signature from a PDF involves identifying and isolating the signature's visual representation, whether it's a digitally embedded signature or a scanned image of a handwritten signature.

They are embedded within the PDF structure as data objects, often associated with a signature handler that uses Public/Private Key cryptography. These data objects include information about what parts of the document were signed, the signer’s identity, and a cryptographic hash. The extraction involves locating these fields, reading their content, and interpreting the digital certificate and signature metadata. Digital signatures are generally interactive with form field of type /Sig th