話說有朋友寫一沒有跟我要身分證字號、出生年月日、姓名、住址。我跟她說下回碰頭我當面寫給她。
Internet中文叫網際網路。顧名思義，它就是將各個網路連結起來的大網。而資料在網上傳的時候，就是用電子信號取代古時候的馬匹，在各網路間接力傳遞。也就是說，只要想看，那就是雁過拔毛，經過自己網路的資訊，通通可以攔截。因此，寄電子郵件的私密性其實連明信片都還不如。因為經手明信片的人比電郵少多了。
別以為網路上資訊流量大就沒事。有心人很容易就能寫個專找身分證字號的小程式。如果萬一您非在電郵裡提些敏感資訊的話，最好另外用程式加密。如果您不懂，還是能用一些原始、陽春的方法加密：比方說，您的身分證字號是：A123456789，可以寫成：“B垃圾234其他垃圾567更多垃圾890”這樣可能可以騙過過濾身分證字號的程式。然後再用別的方法告訴收件人，要把垃圾去掉，然後字母用前一個、數字各加一。方法百百種，請自行發揮創意。當然最好是用別的程式加密。
Please treat e-mail as postcards: anything you are not comfortable sending by a postcard, do not write that in an e-mail.
As its name indicates, Inter-Net is a giant net based on connected local area networks. Everything transmitted through the Internet is relayed through someone else's network. All the information relayed by a network can be intercepted. It is very easy to write small programs to filter the target information, such as ID number, driver's licence number, etc. Hence the privacy of an e-mail is even worse than a postcard, as an e-mail needs to go through more organizations than a postcard.
If you must send sensitive information via e-mail, you should encrypt it. If you do not know how to, then you can at least scramble your message, and, through another channel, teach the recipient how to unscramble it.
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