Category Archives: Telephone

Cloudflare 看這次 815 斷電的網路使用變化

Cloudflare 分析了這次 815 停電對網路造成的影響:「Power outage hits the island of Taiwan. Here’s what we learned.」。 以 Cloudflare 在是方機房的 QPS 來看,停電後反而沒有太大變化: 把裝置種類拆開來看,可以看到桌機的使用量下降,但手機的使用量上升: 這點從 HiNet 的使用頻寬也可以看出來,頻寬使用量降了 25% (從光世代與 ADSL/VDSL 換到行動網路上?):

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加州的手機防竊提案讓失竊率下降不少...

2013 的時候提過「加州的手機防竊提案...」,後來在 2015 年生效: In a press release sent to reporters on Thursday, George Gascón said that since the law went into effect on July 1, 2015[,] 在兩大陣營都有類似的功能: Such a kill switch has become standard in all iPhones ("Activation Lock") … Continue reading

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手機上用 FPGA 的想法...

在「Apps with hardware: enabling run-time architectural customization in smart phones」這邊看到去年就有論文在討論在手機上使用 FPGA 的想法... 的確現在 FPGA 的價錢其實是蠻平價的了... 除了透過 GPU 加速外,FPGA 聽起來也是個不錯的方向 @_@ 最直接的例子就是 AES 運算來看,可以看到比現在最快的實做快了半個數量級,大約三倍?(跟支援硬體加速的 OpenSSL 比,看格子大約是半格,也就是 100.5,約 3.16 倍)。 而如果是純軟體的應用,有些會差到四個數量級... (萬?)

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透過手機螢幕上的餘熱猜測 PIN 碼

利用手機螢幕上的餘熱分析可能的 PIN 碼:「Heat traces left by fingers can reveal your smartphone PIN」,在輸入完 PIN 碼的 30 秒內的準確度都還是很高 (80%): The report further revealed that if the thermal image is collected within 15 seconds of a PIN being entered, the technique is accurate … Continue reading

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Nokia 3310 的復出...

這消息傳遍了整個科技界:「HMD Global will launch the Nokia 3, 5, and 6 at MWC, plus a 3310 homage」,不過一個最大的問題是只支援 2.5G:(出自「Nokia 3310 (2017)」) The phone only runs on 2.5G at the time of launch, which has subjected the phone to criticism, and means that … Continue reading

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在手機裡面放木馬後故意讓手機被偷走的紀錄片...

在手機裡面裝木馬後故意讓別人偷走,然後觀察小偷的行為並且拍成紀錄片:「Student Lets Thief Steal His Phone, Spies On Him For Weeks To Make This Documentary」。 影片已經有人翻譯完,有中文字幕可以開起來看: 裡面用的木馬 (防盜軟體) 是 Cerberus。

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Android 上透過 DAC (i.e. 耳機或是喇叭) 再做 ADC (i.e. 麥克風) 的傳輸

看到「Quiet for Android - TCP over sound」這個給 Android 用的專案,就是以前的撥接數據機嘛... 在直接拉線對連時連速度都還蠻像的: Quiet's provided audible mode transfers at approximately 7kbps. In cases where two devices are connected over a cable (via 3.5mm jack) it can run in cable mode, which transfers at … Continue reading

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印度的免費 4G...

印度最富有的企業家決定提供免費的 4G 網路讓更多人可以上網:「India's richest man offers free 4G to one billion people」: India's richest man is rolling out a $20 billion mobile network that could bring lightning-fast Internet to hundreds of millions of people. 到 2016 年底: Indians will be … Continue reading

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Open Source 版本的 Skype

前幾天講到用 Docker 跑 Skype 的「用 Docker 跑 Skype 講電話」,剛剛就看到「skypeopensource2」這個專案,不過目前功能非常有限: First in world self-made client to Skype Network based on reversing original Skype 5.5 client. For now, only receiving and sending messages are supported. 然後看了一下專案內容,應該是 Windows-only,這樣應該還是暫時會用 Docker 版本的 Skype 吧... 最主要還是拿來打電話 … Continue reading

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