Malicious charging cables look exactly like normal ones.
The https://t.co/ye56sj1TFQ cable is the clearest example. looks like a standard Apple Lightning or USB-C cable. a hidden chip inside gives an attacker remote access to your device the moment you plug it in.
what it can do:
— log every keystroke
— inject commands as if someone is typing on your keyboard
— exfiltrate files
— open a remote shell
— operate over WiFi from up to 300 feet away
you cannot tell by looking at it. the chip is inside the cable housing. no visible difference.
Hak5(@Hak5) sells them commercially at $120-$180.
They've been found at conference floors. hotel lobbies. left near charging stations in airports. given away as "free" promotional items at events.
Never plug a cable you didn't buy sealed from a reputable retailer.
never borrow a charging cable from a stranger. ever.
if you need to charge using an unknown cable: use a USB data blocker. it's a small pass-through device that allows power but blocks data pins entirely. costs under $10. fits on a keychain.
if you need to share a cable at a conference: use a power-only cable. no data pins at all. physically cannot transmit anything other than charge.
苫米地四法印定理論文の公式解説 『やさしい完全版 — 数式が苦手な読者のための注解・図解つき 諸行無常・一切皆苦・諸法無我・涅槃寂静』の冒頭から引用。"本書は、仏教の中核である四法印——諸行無常・一切皆苦・諸法無我・涅槃寂静——を、数学の定理として証明した論文『苫米地四法印定理』のやさしい完全版である。前提知識はいらない。これまでの論文を一つも���んでいなくても、最初のページから最後まで読み通せるように、必要な考え方をすべて本書の中でそろえる。
本書のいちばん大事な約束。数式は暗号ではなく、地形と旅の言葉である。登場するすべての式は、「谷」「坂」「合計」「はしご」「安全地帯」といった絵に必ず翻訳する。オレンジ色のこの枠が、その翻訳係だ。緑色の枠「証明の心」は、証明の骨組みを一段落で語る。式を一つも追わなくても、枠だけ拾い読みすれば本書の主張と論理はすべて追える。
ただし本書は「たとえ話だけの本」ではない。各定理は、学術版とまったく同じ正典の式と成立条件を掲げる。省くのは長い計算だけであり、主張・仮定・結論は一切ゆるめない。厳密な完全証明を確かめたい読者のために、各定理の末尾に学術版『TomabechiFourDharmaSealsMini13』の該当節を示す。
全体地図 — 十三の定理で四法印へ
本書の地図。左の土台から右の四法印へ、十三の定理が一本の鎖でつながる。まず四法印を一行ずつ。諸行無常——あらゆる現象は移ろい、とどまらない。一切皆苦——条件づけられた存在は苦を内包する。諸法無我——すべては互いに繋がり合って成り立ち(縁起)、固定した実体としての自我は存在しない。涅槃寂静——苦を滅した静けさは実在する。本書はこの四つを、順に定理23・24・25・26として証明する。
そのために使う土台が九つの定理である。定理1〜4は「心は谷を転がるボールである」という地形の数学。定理16と19は「自己」と「自由」の数学。定理20〜22は「臨場感が心の向きを支配する���方向づけの数学。この九つの上に、四法印の四定理が載る。
1 → 2 → 3 → 4 → 16 → 19 → 20 → 21 → 22 → 23 → 24 → 25 → 26
番号が飛んでいるのは、二十六定理からなる大きな体系のうち、四法印に必要な十三個だけを選んだからである。"
論文 日本語版
https://t.co/8fxb2fPyKe
English paper
https://t.co/9DUUsjyutv
公式解説 日本語版
https://t.co/tPPOo4y5Ed
Lay explanations English
https://t.co/ZTTLSG52eG
How to Read the English Lay explanations of Tomabechi Four Dharma Seals paper.
"This is the plain-language complete edition of the paper Tomabechi Four Dharma Seals Theorems, which proves the four seals at the very core of Buddhism — impermanence, universal unsatisfactoriness, non-self, and nirvanic tranquility — as mathematical theorems. No prior knowledge is assumed. Even if you have read none of the earlier papers, every idea you need is assembled inside this book, from the first page to the last.
For readers who do not read formulas: The single most important promise of this book: formulas are not code — they are the language of landscapes and journeys. Every formula that appears will be translated into pictures: valleys, slopes, totals, ladders, safe zones. This orange box is the translator. The green box, "the heart of the proof," tells the skeleton of each proof in one paragraph. Read only the boxes, and you can still follow every claim and every argument in the book.
This is not, however, a book of metaphors only. Each theorem is stated with the same canonical formulas and the same explicit conditions as the academic edition. Only the long calculations are omitted; no claim, assumption, or conclusion is weakened. For the full rigorous proofs, each theorem ends with a pointer to the corresponding section of the academic edition, TomabechiFourDharmaSealsMini13.
The Map — Thirteen Theorems to the Four Seals
The map of this book: from the base on the left to the Four Seals on the right, thirteen theorems form one chain.
The four seals in one line each. Impermanence — all conditioned phenomena change and do not stay. Universal unsatisfactoriness — conditioned existence contains suffering. Non-self — all beings arise interconnected (dependent origination), and no self exists as a fixed substance. Nirvanic tranquility — the stillness in which suffering has ceased is real. This book proves them, in order, as Theorems 23, 24, 25, and 26."