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JSON Canonicalization
這篇是講 JSON object 上的簽名，但實際上就是在討論 JSON Canonicalization 的前因後果：「How (not) to sign a JSON object」。
在處理 JSON 資料時，「判斷兩個 JSON object 是否相同」是一個不怎麼簡單的問題，其中一個想法是找一個機制可以把意義相同的 JSON object 都轉成相同的 (byte)string representative，這也就是 JSON Canonicalization。當你可以確保意義相同的 JSON Canonicalization 後，你就可以對 string 本身簽名。
這件事情其實在 XML 就有過同樣的歷史故事 (yeah，總是有人愛在某種資料格式上面疊上簽名)，也就是「XML Signature」這個方式。
在 XML 這邊不幸的是，還不少標準選用 XML…
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Unicode pain, no more!
FYI and Note To Self: This is something I have been experiencing intimately while I have been building a Wikipedia bot with some text parsing requirements. Bookmark and study this lecture on what byte strings and unicode strings really are. Do it now. Unicode sandwich.
