content: from cryptography.hazmat.primitives.ciphers.modes import CBC
  from cryptography.hazmat.primitives.ciphers.modes import ECB
  
  
  # Insecure mode
  mode = ECB(iv)
  
  # Secure cipher and mode
  cipher = AES.new(key, blockalgo.MODE_CTR, iv)
  
  # Secure mode
  mode = CBC(iv)
  