Cryptography is the study of secret writing and codes — how to hide a message so only the right person can read it, and how to break a code someone else has made.

Cryptography密碼學 is是 the study of secret writing and codes研究秘密書寫和密碼的學問 how to hide a message也就是怎麼把訊息藏起來 so only the right person can read it讓只有對的人看得懂 and也是 how to break a code怎麼破解 a code someone else has made別人做的密碼

Long ago this meant marks on paper and clever tricks with letters. Today it is just as much about computers: the lock on a messaging app, the shield around online banking, the way a website proves it is really itself.

Long ago很久以前 this meant這指的是 marks on paper紙上的記號 and和 clever tricks with letters字母的巧妙把戲 Today今天 it is just as much about computers它也一樣關於電腦 the lock on a messaging app通訊軟體上的鎖 the shield around online banking網路銀行外面的防護 the way a website proves it is really itself網站證明自己真的是自己的方式

It is a formal, technical word, at home in science class, news about security, and job titles.

It is它是 a formal, technical word一個正式、專業的詞 at home in常出現在 science class科學課 news about security資安新聞 and和 job titles職稱裡

Though actually, a lot of daily talk just says "encryption" for the hiding part, and leaves cryptography as the bigger name for the whole field, including the breaking and the maths behind both. It is the study and the craft, not the person (that person is a cryptographer) and not the everyday login word people in Taiwan call 密碼.

Though actually不過其實 a lot of daily talk日常說法 just says只是說 "encryption"「encryption」也就是加密 for the hiding part指藏訊息的部分 and而 leaves cryptography把cryptography留下來 as the bigger name for the whole field當作整個領域的大名稱 including包括 the breaking破解 and the maths behind both和背後的數學 It is它指的是 the study and the craft這門學問和這項技藝 not the person不是指人 that person is a cryptographer那個人叫cryptographer密碼學家 and也 not不是 the everyday login word日常登入用的那個詞 people in Taiwan call 密碼台灣人說的「密碼」