1.3 Exchanging data

What is Asymmetric Encryption?

• An encryption technique where the same key is used to encrypt and decrypt data.

• An encryption technique where a public key available to everyone is used to encrypt the data, and the data is decrypted by the paired private key known only by the recipient.

• A compression algorithm that retains all the data in the file by only storing the instructions needed to reconstruct the original file.

• A type of lossless compression where text is searched for entries that match the entries in a dictionary.

What is Dictionary Coding?

• A compression algorithm that removes non-essential data from a file leading to a noticeable decrease in accuracy of the data.

• A type of lossless compression where repeated occurrences of the same data are stored as single data values with their counts.

• A type of lossless compression where text is searched for entries that match the entries in a dictionary.

• A method of abstractly describing the data tables and the relationships between them visually.

What is the purpose of Hashing in data security?

• To compress data without losing any information.

• To encrypt data using a public and private key system.

• To validate login credentials like passwords or PINs without revealing the original data to hackers.

• To ensure that all transactions either succeed or fail, and never only partially processed.

What is the difference between Lossless Compression and Lossy Compression?

• Lossless Compression stores data as single values with counts, while Lossy Compression encrypts data.

• Lossless Compression retains all data in the file, while Lossy Compression removes non-essential data.

• Lossless Compression removes non-essential data, while Lossy Compression retains all data in the file.

• Lossless Compression is used for encryption, while Lossy Compression is used for hashing.

What is Run-Length Encoding?

• An encryption technique where the same key is used to encrypt and decrypt data.

• A compression algorithm that removes non-essential data from a file.

• A type of lossless compression where repeated occurrences of the same data are stored as single data values with their counts.

• A method of abstractly describing the data tables and the relationships between them visually.

What is Symmetric Encryption?

• An encryption technique where a public key available to everyone is used to encrypt the data, and the data is decrypted by the paired private key known only by the recipient.

• An encryption technique where the same key is used to encrypt and decrypt data.

• A compression algorithm that retains all the data in the file by only storing the instructions needed to reconstruct the original file.

• A type of lossless compression where text is searched for entries that match the entries in a dictionary.

What does Atomicity ensure in the context of databases?

• True

• False

What is required for a database transaction to be considered Consistent?

• It must be completed under all circumstances.

• It should either succeed or fail, and never only partially processed.

• It must obey the defined validation rules of the database to maintain referential integrity.

• It must reduce redundancy and construct a relational database.

What does Durability guarantee in a database system?

• Transactions can be partially processed.

• Transactions must be validated to maintain referential integrity.

• Once a transaction has begun, it must be completed under all circumstances.

• Data tables and relationships are described visually to reduce redundancy.

What is Entity-Relationship Modelling used for?

• To compress data without losing any information.

• To encrypt data using a symmetric key system.

• To validate login credentials like passwords or PINs.

• To abstractly describe the data tables and the relationships between them visually.