The most secure method of communication is a one-time pad, a pre-shared private key.
"A one-time pad (OTP) is considered theoretically the most secure method of communication — when it’s implemented correctly. That means:
1. The key (pad) is truly random.
2. The key is at least as long as the message.
3. The key is used only once.
4. The key is securely shared in advance and kept completely secret.
When all these conditions are met, a one-time pad provides perfect secrecy — an eavesdropper cannot learn anything about the message, even with infinite computing power."
"A one-time pad (OTP) is considered theoretically the most secure method of communication — when it’s implemented correctly. That means: 1. The key (pad) is truly random. 2. The key is at least as long as the message. 3. The key is used only once. 4. The key is securely shared in advance and kept completely secret.
When all these conditions are met, a one-time pad provides perfect secrecy — an eavesdropper cannot learn anything about the message, even with infinite computing power."