Also if you want to keep a secret a secret forever, encrypted but saved data may be easily decrypted in the future. Most secrets though in reality are less useful in X years time.
replyTheoretically maybe, but there's no indication that a quantum-resistant algorithm can't encrypt something that's secure for the coming million+ years.
replySure there is, just use a one time pad and never repeat the message.
replyOops - you said the opposite of what I read, my mistake.