The core objectives of encryption security

Confidentiality: Ensure that only authorized parties can decrypt and read data (such as user passwords, transaction records).

Integrity: Prevent data from being tampered with during transmission/storage (such as detecting malicious modifications to files).

Authentication: Confirm the authenticity of the identities of both parties in communication (such as HTTPS certificate validating the legitimacy of a website).

Typical use cases of encryption technology

Data transmission: HTTPS (web), SMTP/TLS (email), VPN (remote access).

Data storage: Cloud drive encryption (such as iCloud encryption), encryption of sensitive fields in databases, local hard drive encryption.

Authentication: Digital signatures (such as code signing certificates), certificate login (replacing passwords, such as SSH key pairs).

Privacy protection: Encrypted communication (Signal), anonymous communication (Tor network using multi-layer encryption).