I have been researching cryptography and this question just came to mind, if someone intercepts a cyphertext and doesn’t know the algorithm used, then for all he knows it could be using the strongest or the weakest algorithms out there
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You’ve just discovered One-Time Pad, a completely unbreakable encryption technique. There are an infinite number of possible answers, and therefore you can’t possibly figure out what the plaintext is without additional information.
This doesn’t matter in practice because we use specific protocols to communicate that are known (or can be easily discovered) by attackers. If you used a bad algorithm and relied on Security Through Obscurity to protect your information, a single leak means that all your messages are compromised.
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