Question: code in c++ 10 #ifndef PROJ05_PLAYFAIR 11 #define PROJ05PLAYFAIR 12 13 #include 14 using std::string; 15 #includecctype> 16 7 // playfair from 8 // http://practicalcryptography.com/ciphers/classical-era/playfair/

code in c++

code in c++ 10 #ifndef PROJ05_PLAYFAIR 11 #define PROJ05PLAYFAIR 12 13 #include 14 using std::string; 15 #includecctype> 16 7 // playfair from 8 // 23 string prepare_plaintext(const string &s) 24 string create_encoding(const string &key) 25 string encode_pair(const string &pr, const string &key); 26 string decode_pair(const string &pr, const string &key); 27 string encode (const string &plaintxt, const string &key) 28

10 #ifndef PROJ05_PLAYFAIR 11 #define PROJ05PLAYFAIR 12 13 #include 14 using std::string; 15 #includecctype> 16 7 // playfair from 8 // http://practicalcryptography.com/ciphers/classical-era/playfair/ 19 20 const string alphabet_minus_j-"abcdefghiklmnopqrstuvwxyz"; 21 const int dim -5 - 23 string prepare_plaintext(const string &s) 24 string create_encoding(const string &key) 25 string encode_pair(const string &pr, const string &key); 26 string decode_pair(const string &pr, const string &key); 27 string encode (const string &plaintxt, const string &key) 28 string decode (const string &encodedtxt, const string &key); 29 30 #endif 31

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