A company needs a highly secure method to transfer documents over an insecure network. The documents are highly sensitive, and the documents' encryption must be guaranteed even if the network…

Symmetric encryption relies on a shared secret key and its security depends on proper key management and strength, making it vulnerable to various attacks if the key is compromised.

Lightweight encryption algorithms are designed for resource-constrained environments, which does not inherently guarantee higher security and might offer weaker protection than standard algorithms.

Asymmetric encryption uses public and private key pairs for secure key exchange and non-repudiation but does not offer the theoretical perfect secrecy of a one-time pad.

A one-time pad is the only encryption technique known to be theoretically unbreakable if used correctly, meaning the key is truly random, at least as long as the plaintext, and used only once. This method provides perfect secrecy, ensuring the documents' encryption is guaranteed against any interception.