Translator Reviews ( Chinese (Traditional) → English )

Additional info: 密文：（Ciphertext / Cyphertext）
明文：Plaintext
密碼學：Cryptography
中國式密碼：（Chinese Cipher）
「謎」式密碼機：（Enigma）

主要為科普文章，圖片部分可以參考自此：https://medium.com/@tih/%E6%88%91%E5%92%8C%E4%BD%A0%E7%9A%84%E5%B0%88%E5%B1%AC%E5%AF%86%E8%AA%9E-5982868d0724

Chinese (Traditional)

密碼學可分為古典密碼學與現代密碼學，我們先來看看比較平易近人（？）的古典密碼學。

古典密碼學主要採用兩種方式：替換與移項。
替換式密碼又稱取代加密法，是一種按規律將文字加密的方式。

替換式密碼中可以用不同字母數為一單元，例如每一個或兩個字母為一單元，然後再作加密。密文接收者解密時需用原加密方式解碼才可取得原文本。由於拼音文字中字的組成為有限的字母，以英語為例只有26個字母，組成可能的單元數較少，因此使用替換式密碼相對較為容易，而且亦可使用簡單機械進行加密；

English

Cryptography can be categorized as Classical Cryptography and Modern Cryptography. Let's take a look at Classical Cryptography, which seems more friendly(?).

Classical Cryptography uses mainly two methods, substitution and transposition.
A substitution cipher is also called substitution encryption, which is a method to encrypt letters systematically.

Different alphabets can be used as a unit In a substitution cipher, for example, each one or two alphabets as a unit, and then encrypt them. Receivers need to decipher the ciphertext with the same encrypting methods to get the original text. Since the alphabets in a phonogram are limited, for example, only 26 alphabets in English, the number of possible combinations is relatively small. Therefore, using a substitution cipher is relatively easy, and it is also possible to use simple machines to encrypt.