#include
#include
#include
using?namespace?std;

#define?infinite?9999999

void?encryption（stringint）;
void?decryption（stringintint）;
void?getFrequency（double*string）;
void?crack（string）;
int?main（）
{
	int?key;
	string?FilePath;
	int?option?;???//選擇項
	while（1）
	{
		cout<<“please?select?option?number:“<		cout<<“1.encryption“<		cout<<“2.decryption“<		cout<<“3.crack“<		cout<<“4.exit“<		cin?>>?option;
		if（option==4）?break;
		switch?（option）
		{
		case?1:
			cout<<“please?enter?the?file?path:“<			cin>>FilePath;
			cout<<“please?enter?the?key:“<			cin>>key;
			encryption（FilePathkey）;
			break;
		case?2:
			cout<<“please?enter?the?file?path:“<			cin>>FilePath;
			cout<<“please?enter?the?key:“<			cin>>key;
			decryption（FilePathkey0）;?????//0表示解密?1表示破解
			break;
		case?3:
			cout<<“please?enter?the?file?path:“<			cin>>FilePath;
			crack（FilePath）;
			break;
		}
	}
}

void?encryption（string?filepathint?key）
{
	char?character;
	ifstream?inputFile（filepathios::in）;
	ofstream?encrpFile（“encryption\\encryption.txt“ios::out）;
	//取單個字符分別加密
	while（!inputFile.eof（））
	{
		//inputFile>>character;
		inputFile.get（character）;
		if（character>=‘a‘&&character<=‘z‘）
		{
			character=character+key<=‘z‘?character+key:character-26+key;??//減去key小于a的aski碼值+26
		}
		else?if（character>=‘A‘&&character<=‘Z‘）
		{
			character=character-key>=‘Z‘?character-key:character-26+key;
		}
		encrpFile<	}
	inputFile.close（）;
	encrpFile.close（）;
}
void?decryption（string?filepathint?keyint?option）
{
	char?character;
	string?decryPath;
	ifstream?inputFile（filepathios::in）;
	if（option==0）?//解密
	{
		decryPath=“decryption\\decrption.txt“;

	}else?if（option==1）
	{
		decryPath=“crack\\crack.txt“;
	}
	ofstream?decryFile（decryPathios::out）;
	
	//取單個字符分別加密
	while（!inputFile.eof（））
	{
		inputFile>>character;
		if（character>=‘a‘&&character<=‘z‘）
		{
			character=character-key>=‘a‘?character-key:character+26-key;??//減去key小于a的aski碼值+26
		}
		else?if（character>=‘A‘&&character<=‘Z‘）
		{
			character=character-key>=‘A‘?character-key:character+26-key;
		}
		decryFile<	}
	inputFile.close（）;
	decryFile.close（）;
}
void??crack（string?filepath）
{
	
	int?key;
	double?frequency[26]={0};
	long?double?temp;
	double?Chi_squared=infinite;
	double?expect[26]={0.081670.014920.027820.042530.127020.022280.020150.060940.069660.001530.00772
		0.040250.024060.067490.075070.019290.000950.059870.063270.090560.027580.009780.023610.001500.019740.00074};
	getFrequency（frequencyfilepath）;
	for（?int?j=0;j<26;j++）
	{
		temp=0;
		for（int?i=0;i<26;i++）?????//卡方校驗
		{
			temp+=（frequency[（i+j）%26]-expect[i]）*（frequency[（i+j）%26]-expect[i]）/expect[i];
			

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件???????3226??2017-10-24?17:41??CaesarCipher\CaesarCipher\CaesarCipher.vcxproj

?????文件????????942??2017-10-24?17:41??CaesarCipher\CaesarCipher\CaesarCipher.vcxproj.filters

?????文件????????143??2017-10-24?16:14??CaesarCipher\CaesarCipher\CaesarCipher.vcxproj.user

?????文件????????265??2017-10-31?16:31??CaesarCipher\CaesarCipher\crack\crack.txt

?????文件????????381??2017-10-31?16:38??CaesarCipher\CaesarCipher\Debug\CaesarCipher.exe.intermediate.manifest

?????文件?????????67??2017-10-31?16:38??CaesarCipher\CaesarCipher\Debug\CaesarCipher.lastbuildstate

?????文件???????2009??2017-10-31?16:38??CaesarCipher\CaesarCipher\Debug\CaesarCipher.log

?????文件????????713??2017-10-25?20:39??CaesarCipher\CaesarCipher\Debug\CaesarCipher.vcxprojResolveAssemblyReference.cache

?????文件??????????0??2017-10-25?20:39??CaesarCipher\CaesarCipher\Debug\CaesarCipher.write.1.tlog

?????文件????????560??2017-10-31?16:38??CaesarCipher\CaesarCipher\Debug\cl.command.1.tlog

?????文件???????3954??2017-10-31?16:38??CaesarCipher\CaesarCipher\Debug\CL.read.1.tlog

?????文件????????336??2017-10-31?16:38??CaesarCipher\CaesarCipher\Debug\CL.write.1.tlog

?????文件???????1188??2017-10-31?16:38??CaesarCipher\CaesarCipher\Debug\link.command.1.tlog

?????文件???????2480??2017-10-31?16:38??CaesarCipher\CaesarCipher\Debug\link.read.1.tlog

?????文件????????604??2017-10-31?16:38??CaesarCipher\CaesarCipher\Debug\link.write.1.tlog

?????文件?????254073??2017-10-31?16:38??CaesarCipher\CaesarCipher\Debug\main.obj

?????文件????????468??2017-10-31?16:38??CaesarCipher\CaesarCipher\Debug\mt.command.1.tlog

?????文件????????898??2017-10-31?16:38??CaesarCipher\CaesarCipher\Debug\mt.read.1.tlog

?????文件????????282??2017-10-31?16:38??CaesarCipher\CaesarCipher\Debug\mt.write.1.tlog

?????文件?????207872??2017-10-31?16:38??CaesarCipher\CaesarCipher\Debug\vc100.idb

?????文件?????249856??2017-10-31?16:38??CaesarCipher\CaesarCipher\Debug\vc100.pdb

?????文件????????265??2017-10-31?16:30??CaesarCipher\CaesarCipher\decryption\decrption.txt

?????文件????????340??2017-10-31?16:38??CaesarCipher\CaesarCipher\encryption\encryption.txt

?????文件???????3796??2017-10-31?16:38??CaesarCipher\CaesarCipher\main.cpp

?????文件????6377472??2017-11-14?17:53??CaesarCipher\CaesarCipher.sdf

?????文件????????903??2017-10-24?16:14??CaesarCipher\CaesarCipher.sln

????..A..H.?????15872??2017-11-14?17:53??CaesarCipher\CaesarCipher.suo

?????文件??????98816??2017-10-31?16:38??CaesarCipher\Debug\CaesarCipher.exe

?????文件?????666396??2017-10-31?16:38??CaesarCipher\Debug\CaesarCipher.ilk

?????文件?????756736??2017-10-31?16:38??CaesarCipher\Debug\CaesarCipher.pdb

............此處省略13個文件信息