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Bacon cipher: Difference between revisions
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e AABAA l ABABA r BAAAA y BABBA
f AABAB m ABABB s BAAAB z BABBB
=={{header|C++}}==
Bacon cipher implementation
<lang cpp>
#include <iostream>
#include <algorithm>
#include <vector>
#include <bitset>
#include <string>
class bacon {
public:
bacon() {
int x = 0;
for( ; x < 9; x++ )
bAlphabet.push_back( std::bitset<5>( x ).to_string() );
bAlphabet.push_back( bAlphabet.back() );
for( ; x < 20; x++ )
bAlphabet.push_back( std::bitset<5>( x ).to_string() );
bAlphabet.push_back( bAlphabet.back() );
for( ; x < 24; x++ )
bAlphabet.push_back( std::bitset<5>( x ).to_string() );
}
std::string encode( std::string txt ) {
std::string r;
size_t z;
for( std::string::iterator i = txt.begin(); i != txt.end(); i++ ) {
z = toupper( *i );
if( z < 'A' || z > 'Z' ) continue;
r.append( bAlphabet.at( ( *i & 31 ) - 1 ) );
}
return r;
}
std::string decode( std::string txt ) {
size_t len = txt.length();
while( len % 5 != 0 ) len--;
if( len != txt.length() ) txt = txt.substr( 0, len );
std::string r;
for( size_t i = 0; i < len; i += 5 ) {
r.append( 1, 'A' + std::distance( bAlphabet.begin(), std::find( bAlphabet.begin(), bAlphabet.end(), txt.substr( i, 5 ) ) ) );
}
return r;
}
private:
std::vector<std::string> bAlphabet;
};
</lang>
These next 2 classes use the 0's & 1's generated by the 'Bacon encryption' to create different the outputs.
One could go wild here...
<lang cpp>
class cipherI {
public:
std::string encode( std::string txt ) {
txt = b.encode( txt );
std::string e, d = "one morning, when gregor samsa woke from troubled dreams, he found himself transformed "
"in his bed into a horrible vermin. he lay on his armour-like back, and if he lifted his head a little he "
"could see his brown belly, slightly domed and divided by arches into stiff sections.";
size_t r = 0;
char t;
for( std::string::iterator i = txt.begin(); i != txt.end(); i++ ) {
t = d.at( r );
while( t < 'a' || t > 'z' ) {
e.append( 1, t );
r++;
t = d.at( r );
}
r++;
e.append( 1, *i == '1' ? t - 32 : t );
}
return e;
}
std::string decode( std::string txt ) {
std::string h;
for( std::string::iterator i = txt.begin(); i != txt.end(); i++ ) {
if( *i < 'a' && ( *i < 'A' || *i > 'Z' ) || *i > 'z' ) continue;
h.append( 1, *i & 32 ? '0' : '1' );
}
return b.decode( h );
}
private:
bacon b;
};
class cipherII {
public:
std::string encode( std::string txt ) {
txt = b.encode( txt );
std::string e;
for( std::string::iterator i = txt.begin(); i != txt.end(); i++ )
e.append( 1, *i == '0' ? 0xf9 : 0xfa );
return e;
}
std::string decode( std::string txt ) {
std::string h;
for( std::string::iterator i = txt.begin(); i != txt.end(); i++ ) {
h.append( 1, *i == ( char )0xf9 ? '0' : '1' );
}
return b.decode( h );
}
private:
bacon b;
};
int main( int argc, char* argv[] ) {
cipherI c1;
cipherII c2;
std::string s = "lets have some fun with bacon cipher";
std::string h1 = c1.encode( s ),
h2 = c2.encode( s );
std::cout << h1 << std::endl << std::endl << h2 << std::endl << std::endl;
std::cout << c1.decode( h1 ) << std::endl << std::endl << c2.decode( h2 ) << std::endl << std::endl;
return 0;
}
</lang>
{{out}}
<pre>
oNe MornIng, WheN gRegoR saMSA woke fRom TRouBleD dreAmS, He FoUnD HimSelf tRaNS
foRMeD In hIs Bed iNto a HorRiblE VErmin. He lay on hiS arMOuR-lIKe back, And If
he lIFTed hIS HeaD a lIttle
¨·¨·¨¨¨·¨¨·¨¨·¨·¨¨¨·¨¨···¨¨¨¨¨·¨¨··¨¨·¨¨·¨¨¨·¨··¨·¨·¨··¨¨·¨¨¨¨·¨··¨¨··¨··¨¨·¨·¨¨
¨·¨¨¨·¨¨·¨¨¨···¨¨¨¨·¨¨¨¨¨¨¨¨·¨¨··¨·¨··¨¨¨¨¨·¨¨·¨¨¨¨···¨¨¨···¨¨·¨¨·¨¨¨¨
LETSHAUESOMEFUNWITHBACONCIPHER
LETSHAUESOMEFUNWITHBACONCIPHER
</pre>
=={{header|J}}==
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