Explanation:The database system sends a challenge string to the user. The user encrypts the challenge string using a secret password as encryption key and then returns the result. The database system can verify the authenticity of the user by decrypting the string with the same secret password and checking the result with the original challenge string. 8. Assymmetric Encryption: Why can a message encrypted with the Public Key only be decrypted with the receiver’s appropriate Private Key?
A. Not true, the message can also be decrypted with the Public Key
B. A so called “one way function with back door” is applyed for the encryption
C. The Public Key contains a special function which is used to encrypt the message and which can only be reversed by the appropriate Private Key
D. The encrypted message contains the function for decryption which identifies the Private Key
Answer:A
Explanation:The database system sends a challenge string to the user. The user encrypts the challenge string using a secret password as encryption key and then returns the result. The database system can verify the authenticity of the user by decrypting the string with the same secret password and checking the result with the original challenge string. 8. Assymmetric Encryption: Why can a message encrypted with the Public Key only be decrypted with the receiver’s appropriate Private Key?
A. Not true, the message can also be decrypted with the Public Key B. A so called “one way function with back door” is applyed for the encryption C. The Public Key contains a special function which is used to encrypt the message and which can only be reversed by the appropriate Private Key D. The encrypted message contains the function for decryption which identifies the Private Key
Explanation:An one-way function is a function which a computer can calculate quickly, but whose reversal would last months or years. An one-way function with back door can be reversed with the help of a couple of additional information (the back door), but scarcely without this information. The information for the back door is contained in the private Key. 9. Which is the largest disadvantage of the symmetric Encryption?