C2endo

C2endo is a term used in privacy and security literature to describe a family of software frameworks and protocols designed to enable end-to-end data security in distributed applications. It denotes architectures that keep data under the sole control of the data owner while allowing authorized processing by other parties through cryptographic techniques and secure computation.

Typical components of C2endo-inspired systems include client-side encryption, cryptographic protocols for secure computation or zero-knowledge proofs, trusted execution environments or secure enclaves, and an orchestration layer that enforces policy-based access control. The goal is to minimize data exposure in transit and at rest and to provide verifiable guarantees about how data is used.

Use cases span secure messaging, confidential document collaboration, privacy-preserving analytics, and regulated data sharing. In practice, a C2endo approach often requires data to be encrypted before it leaves a device, with decryption restricted to authorized parties and transparent governance to support auditing and compliance.

Because the term is applied across multiple projects and research efforts rather than referring to a single product, implementations labeled as C2endo vary in scope and maturity. It reflects a broader movement toward data sovereignty and privacy-preserving computation rather than a proprietary standard.

See also: end-to-end encryption, secure multiparty computation, privacy-preserving analytics.