Explanation:As there is only one key in the symmetrical encryption, this must be known by both sender and recipient and this key is sufficent to decrypt the secret message. Therefore it must be exchanged between sender and receiver in such a manner that an unauthorized person can in no case take possesion of it. 10. Which is the principle of the encryption using a key?
A. The key indicates which funcion is used for encryption. Thereby it is more difficult to decrypt a intercepted message as the function is unknown
B. The key contains the secret function for encryption including parameters. Only a password can activate the key
C. All functions are public, only the key is secret. It contains the parameters used for the encryption resp. decryption
D. The key prevents the user of having to reinstall the software at each change in technology or in the functions for encryption
Answer:A
Explanation:As there is only one key in the symmetrical encryption, this must be known by both sender and recipient and this key is sufficent to decrypt the secret message. Therefore it must be exchanged between sender and receiver in such a manner that an unauthorized person can in no case take possesion of it. 10. Which is the principle of the encryption using a key?
A. The key indicates which funcion is used for encryption. Thereby it is more difficult to decrypt a intercepted message as the function is unknown B. The key contains the secret function for encryption including parameters. Only a password can activate the key C. All functions are public, only the key is secret. It contains the parameters used for the encryption resp. decryption D. The key prevents the user of having to reinstall the software at each change in technology or in the functions for encryption
Explanation:The encoding of a message is calculated by an algorithm. If always the same algorithm would be used, it would be easy to crack intercepted messages. However, it isn’t possible to invent a new algorithm whenever the old one was cracked, therefor the possibility to parameterize algorithms is needed and this is the assignment of the key. Sanfoundry Global Education & Learning Series – Database Management System.