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Secret codes (密码) keep messages private。Banks, companies, and government agencies use secret codes i...

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It is very hard to break a code without the code book.  In any language, some letters are used more than others.  Only people who know the keyword can read the message.  As long as there have been codes, people have tried to break them.  You can hide a message by having the first letters of each word spell it out.  With a code book, you might write down words that would stand for other words.  Another way to hide a message is to use symbols to stand for specific letters of the alphabet.  
It is very hard to break a code without the code book.  In any language, some letters are used more than others.  Only people who know the keyword can read the message.  As long as there have been codes, people have tried to break them.  You can hide a message by having the first letters of each word spell it out.  With a code book, you might write down words that would stand for other words.  Another way to hide a message is to use symbols to stand for specific letters of the alphabet.  
It is very hard to break a code without the code book.  In any language, some letters are used more than others.  Only people who know the keyword can read the message.  As long as there have been codes, people have tried to break them.  You can hide a message by having the first letters of each word spell it out.  With a code book, you might write down words that would stand for other words.  Another way to hide a message is to use symbols to stand for specific letters of the alphabet.  
It is very hard to break a code without the code book.  In any language, some letters are used more than others.  Only people who know the keyword can read the message.  As long as there have been codes, people have tried to break them.  You can hide a message by having the first letters of each word spell it out.  With a code book, you might write down words that would stand for other words.  Another way to hide a message is to use symbols to stand for specific letters of the alphabet.  
which was written   that was written   on which were written   on that were written  
gone into  gone by  gone in for  go for  
keep mine    keep it secret    keep of secret    keep for secret  
It is very hard to break a code without the code book.  In any language, some letters are used more than others.  Only people who know the keyword can read the message.  As long as there have been codes, people have tried to break them.  You can hide a message by having the first letters of each word spell it out.  With a code book, you might write down words that would stand for other words.  Another way to hide a message is to use symbols to stand for specific letters of the alphabet.  

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