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Cryptography
M4V•Thuis aflevering
Manage episode 154404793 series 1123367
Inhoud geleverd door Chris Thiel. Alle podcastinhoud, inclusief afleveringen, afbeeldingen en podcastbeschrijvingen, wordt rechtstreeks geüpload en geleverd door Chris Thiel of hun podcastplatformpartner. Als u denkt dat iemand uw auteursrechtelijk beschermde werk zonder uw toestemming gebruikt, kunt u het hier beschreven proces https://nl.player.fm/legal volgen.
Starting Code:
import java.util.Scanner;
/**
* Simple Polyalphabetic Cryptography
*
* @Chris Thiel
* @28 Feb 2009
*/
public class VignereCipherStartingCode
{
private static final String alphabet="ABCDEFGHIJKLMNOPQRSTUVWXYZ";
private static int nextChar(String k, int i){
i=i%k.length();
String letter=k.substring(i,i+1);
return alphabet.indexOf(letter);
}
public static String encode (String m, String k){
String result="";
for (int i=0; i int offset=nextChar(k, i);
String letter = m.substring(i,i+1);
int newLetterIndex= alphabet.indexOf(letter)+offset;
newLetterIndex=newLetterIndex % 26;
result+=alphabet.substring( newLetterIndex, newLetterIndex+1);
}
return result;
}
public static String decode (String m, String k){
String result="";
return result;
}
public static void main(String[] args)
{
Scanner kb=new Scanner(System.in);
System.out.print("Type a key: ");
String key=kb.nextLine();
key=key.toUpperCase();
key=key.replace(" ","");//omit spaces
System.out.print("Type a message: ");
String message=kb.nextLine();
message=message.toUpperCase();
message=message.replace(" ","");
System.out.println("Using the key \""+key+"\" on \""+message+"\":");
String codedMessage=encode(message,key);
System.out.println("Coded="+codedMessage);
System.out.println("Decoded="+decode(codedMessage,key));
System.out.println("Using the key 'LOVE' we encode 'BOOHOO' we should get 'MCJLZC' : "+encode("BOOHOO","LOVE"));
System.out.println("Using the key 'QUICK' we decode 'TOKMXEQ' we should get 'DUCKNOW': "+decode("TOKMXEQ","QUICK"));
}
}
- 8 points: Complete the decode method so it can decipher the Vignere Cipher
- 9 points: Adapt this so it can do a Progressive Polyalphabetic Cipher rather than a key
- 10 points: Adapt the CarTalk Employee Applet's graphic user interface so that you can type a message in one text area, press a button and it shows the encoded text (using the Progressive Cipher), press another button and it shows the decoded text.
- 11 points: Add a "key field" to the Applet, and use the Vignere Cipher, working in a similiar fashion as the 10 point version
24 afleveringen
M4V•Thuis aflevering
Manage episode 154404793 series 1123367
Inhoud geleverd door Chris Thiel. Alle podcastinhoud, inclusief afleveringen, afbeeldingen en podcastbeschrijvingen, wordt rechtstreeks geüpload en geleverd door Chris Thiel of hun podcastplatformpartner. Als u denkt dat iemand uw auteursrechtelijk beschermde werk zonder uw toestemming gebruikt, kunt u het hier beschreven proces https://nl.player.fm/legal volgen.
Starting Code:
import java.util.Scanner;
/**
* Simple Polyalphabetic Cryptography
*
* @Chris Thiel
* @28 Feb 2009
*/
public class VignereCipherStartingCode
{
private static final String alphabet="ABCDEFGHIJKLMNOPQRSTUVWXYZ";
private static int nextChar(String k, int i){
i=i%k.length();
String letter=k.substring(i,i+1);
return alphabet.indexOf(letter);
}
public static String encode (String m, String k){
String result="";
for (int i=0; i int offset=nextChar(k, i);
String letter = m.substring(i,i+1);
int newLetterIndex= alphabet.indexOf(letter)+offset;
newLetterIndex=newLetterIndex % 26;
result+=alphabet.substring( newLetterIndex, newLetterIndex+1);
}
return result;
}
public static String decode (String m, String k){
String result="";
return result;
}
public static void main(String[] args)
{
Scanner kb=new Scanner(System.in);
System.out.print("Type a key: ");
String key=kb.nextLine();
key=key.toUpperCase();
key=key.replace(" ","");//omit spaces
System.out.print("Type a message: ");
String message=kb.nextLine();
message=message.toUpperCase();
message=message.replace(" ","");
System.out.println("Using the key \""+key+"\" on \""+message+"\":");
String codedMessage=encode(message,key);
System.out.println("Coded="+codedMessage);
System.out.println("Decoded="+decode(codedMessage,key));
System.out.println("Using the key 'LOVE' we encode 'BOOHOO' we should get 'MCJLZC' : "+encode("BOOHOO","LOVE"));
System.out.println("Using the key 'QUICK' we decode 'TOKMXEQ' we should get 'DUCKNOW': "+decode("TOKMXEQ","QUICK"));
}
}
- 8 points: Complete the decode method so it can decipher the Vignere Cipher
- 9 points: Adapt this so it can do a Progressive Polyalphabetic Cipher rather than a key
- 10 points: Adapt the CarTalk Employee Applet's graphic user interface so that you can type a message in one text area, press a button and it shows the encoded text (using the Progressive Cipher), press another button and it shows the decoded text.
- 11 points: Add a "key field" to the Applet, and use the Vignere Cipher, working in a similiar fashion as the 10 point version
24 afleveringen
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