Primary data - Original data collected for the first time for a specific purpose. For instance, interviews or data collected by cameras., Secondary data - Data that has already been collected by someone else for a different purpose. For instance, a website, an online news article, or a set of training data. , Relational database - A database that has more than one table linked by their primary key and corresponding foreign key. , Validation - Only suitable data can be entered. , Verification - Checking that the data entered is the actual data that is wanted or that the data entered matches the original source of data., Public information - Examples such as an organization's name, address, and telephone number., Confidential information - An example includes bank details., Sensitive information - An example includes biometric details., Personal information - Examples include ethnic origin or political opinions., Data visualization - The process of converting large sets of data into charts, graphs, or other visual presentations., Encryption - The process of converting readable data into unreadable characters to prevent unauthorized access., Symmetric key encryption - This is where the key to encode and decode the data is the same, commonly used in wireless security as well as the security of archived data and databases., Public key encryption - This uses two different keys; the public key is used to encode data while the private key is used to decode data., Secure Socket Layer - A protocol developed for sending information securely over the Internet by using an encrypted link between a web server and a browser., Transport Layer Security - Provides security between client and server applications communicating over the Internet., Data masking - The process of replacing confidential data with functional ficititious data, anonymizing the data., Data erasure - The destruction of data at the end of the data life cycle., Data deletion - The sending of a file to the recycle bin, which removes the file icon and pathway of its location., Blockchain - A digital ledger of transactions that is duplicated and distributed across a network of computers.,

3.1E - Collecting and organizing data, 3.1F - Representing data, 3.1G - Data Security

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