Fibonacci & Cryptography Method for Confidential Messages/Passwords

Cryption.java

package code;

public class Cryption 
{
	StringBuffer key = new StringBuffer("abcd");
	public String encryptText(String password)
	{
		int a = 0, b = 1, c = 0, m = 0, k = 0, j = 0;
		String cipher = "", temp = "";
		StringBuffer pw = new StringBuffer(password);
		pw = pw.reverse();
		pw = pw.append(key);
		temp = pw.toString();
		char stringArray[] = temp.toCharArray();
		String evenString = "", oddString = "";
		char evenArray[];
		char oddArray[];
		for (int i = 0; i < stringArray.length; i++) 
		{
			if(i%2 == 0)
			{
				oddString = oddString + Character.toString(stringArray[i]);
			}
			else
			{
				evenString = evenString + Character.toString(stringArray[i]);
			}
		}
		evenArray = new char[evenString.length()];
		oddArray = new char[oddString.length()];
		while(m <= key.length())
		{
			if(m == 0)
				m = 1;
			else
			{
				a = b;
				b = c;
				c = a + b;
				for (int i = 0; i < evenString.length(); i++) 
				{
					int p = evenString.charAt(i);
					int cip = 0;
					if(p == '0' || p == '1' || p == '2' || p == '3' || p == '4' || p == '5' || p == '6'
							|| p == '7' || p == '8' || p == '9')
					{
						cip = p - c;
						if(cip < '0')
							cip = cip + 9;
					}
					else
					{
						cip = p - c;
						if(cip < 'a')
						{
							cip = cip + 26;
						}
					}
					evenArray[i] = (char) cip;
				}
				for (int i = 0; i < oddString.length(); i++) 
				{
					int p = oddString.charAt(i);
					int cip = 0;
					if(p == '0' || p == '1' || p == '2' || p == '3' || p == '4' || p == '5' || p == '6'
							|| p == '7' || p == '8' || p == '9')
					{
						cip = p + c;
						if(cip > '9')
							cip = cip - 9;
					}
					else
					{
						cip = p + c;
						if(cip > 'z')
						{
							cip = cip - 26;
						}
					}
					oddArray[i] = (char) cip;
				}
				m++;
			}
		}
		for (int i = 0; i < stringArray.length; i++) 
		{
			if(i%2 == 0)
			{
				stringArray[i] = oddArray[k];
				k++;
			}
			else
			{
				stringArray[i] = evenArray[j];
				j++;
			}
		}
		for (char d : stringArray) 
		{
			cipher = cipher + d;
		}
		return cipher;
	}
	public String decryptText(String cipher)
	{
		int a = 0, b = 1, c = 0, m = 0, k = 0, j = 0;
		String plain = "";
		char cipherArray[] = cipher.toCharArray();
		String oddString = "", evenString = "";
		char evenArray[];
		char oddArray[];
		for (int i = 0; i < cipherArray.length; i++) 
		{
			if(i%2 == 0)
			{
				oddString = oddString + Character.toString(cipherArray[i]);
			}
			else
			{
				evenString = evenString + Character.toString(cipherArray[i]);
			}
		}
		evenArray = new char[evenString.length()];
		oddArray = new char[oddString.length()];
		while(m <= key.length())
		{
			if(m == 0)
				m = 1;
			else
			{
				a = b;
				b = c;
				c = a + b;
				for (int i = 0; i < evenString.length(); i++) 
				{
					int p = evenString.charAt(i);
					int cip = 0;
					if(p == '0' || p == '1' || p == '2' || p == '3' || p == '4' || p == '5' || p == '6'
							|| p == '7' || p == '8' || p == '9')
					{
						cip = p + c;
						if(cip > '9')
							cip = cip - 9;
					}
					else
					{
						cip = p + c;
						if(cip > 'z')
						{
							cip = cip - 26;
						}
					}
					evenArray[i] = (char) cip;
				}
				for (int i = 0; i < oddString.length(); i++) 
				{
					int p = oddString.charAt(i);
					int cip = 0;
					if(p == '0' || p == '1' || p == '2' || p == '3' || p == '4' || p == '5' || p == '6'
							|| p == '7' || p == '8' || p == '9')
					{
						cip = p - c;
						if(cip < '1')
							cip = cip + 9;
					}
					else
					{
						cip = p - c;
						if(cip < 'a')
						{
							cip = cip + 26;
						}
					}
					oddArray[i] = (char) cip;
				}
				m++;
			}
		}
		for (int i = 0; i < cipherArray.length; i++) 
		{
			if(i%2 == 0)
			{
				cipherArray[i] = oddArray[k];
				k++;
			}
			else
			{
				cipherArray[i] = evenArray[j];
				j++;
			}
		}
		for (char d : cipherArray) 
		{
			plain = plain + d;
		}
		StringBuffer plai = new StringBuffer(plain);
		plai.reverse();
		plain = plai.toString();
		plain = plain.substring(key.length());
		return plain;
	}
  public static void main(String args[])
  {
    System.out.println("Encryption of Hello is "+encryptText("Hello"));
    //Same for Decryption
  }
}