which science focuses on secure communication?

The science that focuses on secure communication is called cryptography.

Core idea

Cryptography is the science (and practice) of designing methods that keep messages confidential, authentic, and tamper‑evident, even when attackers are listening. It does this using mathematical algorithms, keys, and protocols to protect information as it is stored or transmitted over networks.

Related term: cryptology

Some authors use the broader term cryptology , which is defined as the science of secure communications that includes both cryptography (creating secure systems) and cryptanalysis (breaking them). In many modern contexts, “cryptography” is used in everyday language, even when the broader science is meant.

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