Java cipher-decipher program

Cryptography/Cipher-Decipher.java

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+
+import java.util.*;
+package crypyography;
+public class Encryptiondecryption {
+
+	public static void main(String[] args) {
+		Scanner s=new Scanner(System.in);
+		System.out.println("Enter the encryption key(1-25):");
+		int e=s.nextInt();                                              //Encryption key
+		String ptext;
+		String ctext="";
+		char ch;
+		System.out.println("Plaintext-Uppercase Letters Only:");
+		ptext=s.next();                                                 //Plaintext taken from user
+		int len=ptext.length();
+		//Encryption starts from here.
+		for(int i=0;i<len;i++)
+		{
+			ch=ptext.charAt(i);
+			ch=(char)(ch+e);
+			if(ch>90)
+				ch=(char)(ch-26);
+			ctext=ctext+ch;
+
+		}
+		System.out.println("Ciphertext:"+ctext);
+		//Decryption starts from here.
+		System.out.println("Enter Ciphertext-Uppercase Letters Only:");
+		ctext=s.next();
+		len=ctext.length();
+		System.out.println("Plaintext for each encryption key from 1 to 25:");
+		ptext="";
+		for(int i=1;i<=25;i++)
+		{
+			for(int j=0;j<len;j++)
+			{
+				ch=ctext.charAt(j);
+				ch=(char)(ch-i);
+				if(ch<65)
+					ch=(char)(ch+26);
+				ptext=ptext+ch;
+			}
+			System.out.println("Key "+i+" : Plaintext="+ptext);
+			ptext="";
+		}
+
+
+	}
+
+}