Libsignal
Libsignal is an open-source cryptographic library that provides end-to-end encryption for secure messaging applications. It implements the Signal Protocol, which is widely used for encrypting text, voice, and video communications. The library is designed to be cross-platform and is used by applications like Signal, WhatsApp, and Facebook Messenger to ensure privacy and security.
Developers should learn Libsignal when building secure messaging apps that require robust end-to-end encryption to protect user data from eavesdropping and tampering. It is essential for applications handling sensitive communications, such as in healthcare, finance, or privacy-focused platforms, as it provides proven cryptographic protocols without requiring deep expertise in cryptography.