시저 (ver2) 확실히 루비는 파이썬과 형제언어다

class CEA
  # [1] ----------------------------------------------
  def initialize
    @plainText_String   = ''
    @plainText_Decrypt_String = ''
    @plainText_length_int = 0
    @cea_random_key     = 0
    @cipherText_String = ''
    @field_LIST         = Array.new # ****** Array.new
    @field_String       = ''
    @fidld_length_int   = 0
  end
  def field_setting
    for i in (65..90) # range[65, 66, 67, 68, ..., 90]
      @field_LIST.push(i.chr) # ****** .push(i.chr)
    end

    for i in (97..122) # range[97, 98, 99, 100, ..., 122]
      @field_LIST.push(i.chr) # ****** .push(i.chr)
    end

    @field_LIST = @field_LIST.shuffle # python shuffle
    print("#{@field_LIST} \n")
    @field_String =@field_LIST.join('')
    @fidld_length_int = @field_String.length
    print("#{@field_String} \n") # python join vs
    print("[ECHO @fidld_length_int]->   #{@fidld_length_int} \n")
  end
  # --------------------------------------------------
  # [2] ----------------------------------------------
  def plaintext_Write_function
    print("plaintext is ")
    @plainText_String = gets.chomp.to_s
    @plainText_length_int = @plainText_String.length
    print("[ECHO @plainText_String]->   #{@plainText_String} \n")
    print("[ECHO @plainText_length_int]-> #{@plainText_length_int} \n")
  end
  # --------------------------------------------------
  # [3] ----------------------------------------------
  def ceasar_random_key_function
    @cea_random_key = rand(1...25)
    print("[ECHO @cea_random_key]->   #{@cea_random_key} \n")
  end
  # --------------------------------------------------
  # [4] ----------------------------------------------
  def encrypt_ceasar_function
    for i in (0...@plainText_String.length)
      #print("#{@field_LIST.index(@plainText_String[i])} \n") # python find
      if(@field_String.include?(@plainText_String[i]))
        number_int = ( @field_LIST.index(@plainText_String[i]) + @cea_random_key )%@fidld_length_int
        @cipherText_String +=@field_String[number_int]
      else
        @cipherText_String +=@plainText_String[i]
      end
    end
    print("[ECHO @cipherText_String]->  #{@cipherText_String} \n")
  end
  # --------------------------------------------------
  # [5] ----------------------------------------------
  def decrypt_ceasar_function
    for i in (0...@plainText_String.length)
      #print("#{@field_LIST.index(@plainText_String[i])} \n") # python find
      if(@field_String.include?(@cipherText_String[i]))
        number_int = ( @field_LIST.index(@cipherText_String[i]) - @cea_random_key )%@fidld_length_int
        @plainText_Decrypt_String +=@field_String[number_int]
      else
        @plainText_Decrypt_String +=@cipherText_String[i]
      end
    end
    print("[ECHO @plainText_Decrypt_String]->  #{@plainText_Decrypt_String} \n")
  end
end
#---------------------[ main_function ]---------------------
ceasar = CEA.new
ceasar.field_setting
ceasar.plaintext_Write_function
ceasar.ceasar_random_key_function
ceasar.encrypt_ceasar_function
ceasar.decrypt_ceasar_function
#-----------------------------------------------------------