SimpleRailFenceCipher.scala

/**
  * Created by ahmedengu.
  */
object main {

  def main(args: Array[String]) {
    println("Enter the key:")
    val key = scala.io.StdIn.readLine()
    val matrix = Array.ofDim[Char](key.length, key.length)
    println("Enter the PT")
    val pt: String = scala.io.StdIn.readLine()
    for (i <- 0 to pt.length-1) {
      matrix(i/matrix.length)(i%matrix.length)=pt.charAt(i)
    }

    for (i<-key){
      for (j<-0 to matrix.length-1){
        print(matrix(j)(Integer.parseInt(i.toString) - 1))
      }
    }

    println("\nEnter Cipher:")
    val m = Array.ofDim[Char](key.length, key.length)

    val c : String = scala.io.StdIn.readLine()
    var ci:Int = 0
      for (j<-key){
        for (i <- 0 to m.length-1) {
          m(i)(Integer.parseInt(j.toString) - 1) = c.charAt(ci)
          ci+=1
        }
      }
    for (i<-0 to m.length-1){
      for (j<-0 to m.length-1){
        print(m(i)(j))
      }

    }
    println()
  }



}

|SampleOutput

Enter the key:
312
Enter the PT
aoeuidhtn
ednauhoit
Enter Cipher:
ednauhoit
aoeuidhtn