Symmetric key algorithms depend on the shared secret encryption key. what are symmetric key algorithms?

Ineed a good science fair name i’m doing a homemade water filter and i have no idea what the title should be plz

Asoftware company hired ray, a college graduate to work in their development team. ray is assigned to work in the coding phase of a project. what happens during the coding phase of a software development project? a. the customer receives a working model of the software. b. developers convert the program design into code. c. developers gather requirements directly from the stakeholders. d. testing teams check the product for quality.

Q13 what function does a security certificate perform? a. creates user accounts b. scrambles data c. identifies users d. creates password policies e. provides file access