input: Write a python function to generate a 32-digit encryption key using random integers.
  assert len(generateEncryptionKey()) == 32
  assert generateEncryptionKey() != generateEncryptionKey()
  assert all(char.isdigit() for char in generateEncryptionKey())
output: import random
  
  def generateEncryptionKey():
      return ''.join(str(random.randint(0, 9)) for _ in range(32))