| 摘要 |
The invention provides a method for safeguarding values of attributes of a data record that can be stored in a first relational database against unauthorised access, wherein a value of a foreign key attribute of the data record refers to a key for the first relation or for a second relation, and wherein – the value of the foreign key attribute is stored in a mapping relation, – the values of attributes of the data record that are not foreign key attributes are stored in the first relation, and – the mapping relation is stored in a volatile data memory. The invention also provides a method for setting up and/or restoring a mapping relation in a volatile data memory, wherein the mapping relation can be used to store values of foreign key attributes of a data record that is stored in a first relation of a database, wherein at least the values of the foreign key attributes in the first relation are cryptographically encrypted and can preferably be decrypted exclusively using a cryptographic key from the owner of the data record. |
