/// Number of Lines - 70 /// Created on - 29/01/2018 /// This program generates a Hex String that /// can be decrypted using the Decryptor. /// Input - String to Encode. You may even /// leave it empty, for then it will /// use a default string. /// Decryptor - https://code.sololearn.com/cCPY4BDy0pnx/#cpp #include // std::transform #include // std::cout, std::cin #include // rand, srand #include // std::bitset #include // std::vector #include // time using namespace std; // Unable to get rid of this bad habit... string BinToHex(string BStr) /// Converts Binary String to Hex String { string HStr; size_t pos = 0; while(pos!=BStr.size()) { if (BStr.substr(pos,4)=="0000") HStr+='0'; else if(BStr.substr(pos,4)=="0001") HStr+='1'; else if(BStr.substr(pos,4)=="0010") HStr+='2'; else if(BStr.substr(pos,4)=="0011") HStr+='3'; else if(BStr.substr(pos,4)=="0100") HStr+='4'; else if(BStr.substr(pos,4)=="0101") HStr+='5'; else if(BStr.substr(pos,4)=="0110") HStr+='6'; else if(BStr.substr(pos,4)=="0111") HStr+='7'; else if(BStr.substr(pos,4)=="1000") HStr+='8'; else if(BStr.substr(pos,4)=="1001") HStr+='9'; else if(BStr.substr(pos,4)=="1010") HStr+='A'; else if(BStr.substr(pos,4)=="1011") HStr+='B'; else if(BStr.substr(pos,4)=="1100") HStr+='C'; else if(BStr.substr(pos,4)=="1101") HStr+='D'; else if(BStr.substr(pos,4)=="1110") HStr+='E'; else if(BStr.substr(pos,4)=="1111") HStr+='F'; pos+=4; } return HStr; } string Join(vector> BV) /// Joins 16 bitset vector to a String. { string BStr; for(bitset<16> bs:BV) BStr+=bs.to_string(); return BStr; } vector> Encode(string message) /// Encodes message to 16 bitset vector. { vector> EncIn; vector> BV; for(char i:message) {EncIn.push_back(bitset<8>(i));} BV.resize(EncIn.size()); srand(time(nullptr)); auto encodealgo = [](bitset<8> bin)-> bitset<16> { bitset<16> bout; for(int i=0;i<16;i++) bout.set(i,rand()%2); bout[4] = ~bin[0]; // S1 - Invert bit 0 and copy to bit 4. for(int i=1;i<4;i++) bout[10+i] = bin[i]; // S2 - Copy bits 1-3 to bits 11-13.. bout[1] = bin[4]; // S3 - Copy bit 4 to bit 1. for(int i=5;i<7;i++) bout[2+i] = ~bin[i]; // S4 - Copy negtd. bits 5-6 to bits 7-8. bout[10] = bin[7]; return bout; // S5 - Copy bit 10 to bit 7. }; transform(EncIn.begin(),EncIn.end(), BV.begin(),encodealgo); return BV; } int main() { string Encrypt,Decrypt; getline(cin,Decrypt); if(Decrypt.empty()) Decrypt = "Well done mate! You've nailed bitmanipulation :)"; cout<<"Original Data - \n\n" <

Challenge - Special Encryption : Bitmanipulation