Exchanging data (H446)

2. An encryption system using a single key for both encryption and decryption.
3. The input data to a hash function.
5. A collection of related records, organised into columns and rows.
6. The original, unencrypted message.
8. An event where two different inputs produce the same hash output.
11. A data structure that uses hash functions to map keys to values.
13. The study of secure communication techniques.
15. The property of transactions ensuring that concurrent transactions do not interfere with each other.
19. A compression technique that retains all original data.
20. Verifying the integrity of data using a hash value.
22. The scrambled output of an encryption process.

1. An encryption system using a pair of different keys.
4. A language used to manage and query relational databases (acronym).
6. A field that uniquely identifies each record in a table.
7. The property of transactions ensuring data remains valid after a transaction.
9. The method of data reduction where some information is permanently removed.
10. The opposite of compression.
12. A key that links tables together, referencing a primary key in another table.
14. A common file format for lossless image compression.
16. A specific piece of data within a record.
17. A lossless compression method replacing repeated sequences with a count and the character.
18. The property of transactions ensuring that committed transactions persist.
21. The property of transactions ensuring all operations within are completed or none are.