Maybe we should sign our DNA / mRNA to defend us against virus attacks. But we then have to protect our nuclei against malicious root certificates or corrupted keys. Maybe we will also have to encrypt our code, so that viruses and other attackers will have a hard time. But how do we swap a corrupted root key? How do we increase the entropy when our key is not secure enough anymore? And how much energy is consumed for all the crypto?
Never forget to refresh your certificates or your body will DoS on you.