What Is Authenticator And Why Data Compression Should Be Performed Before Encryption


1.    An authenticator is:

a.    A value used to authenticate a message
b.    The party in a protocol who first authenticates the other party
c.    Proof of the authenticity of a certificate
d.    The output of a hash function to be signed

2.    Why should data compression be performed before encryption rather than after?

a.    Compression is less effective on random data
b.    Compressing after encryption interferes with feedback modes for block ciphers
c.    The numeric format of RSA cannot be changed after encryption
d.    It is redundant as commercial compression software includes encryption.


These multiple choice questions belong to Computer Science. The 1st question discusses about authenticator. The 2nd question is about why data compression should be performed before encryption.

Total Word Count NA

Download Full Solution


  • HWA

    this is a very good website

  • HWA

    I have 50 questions for the same test your page is showing only 28

  • HWA

    hi can you please help or guide me to answer my assignments. thanks

  • HWA

    hi can anyone help or guide me to my assignments. thanks

  • HWA

  • HWA

    This solution is perfect ...thanks

  • HWA

    Hello Allison,I love the 2nd image that you did! I also, had never heard of SumoPaint, is something that I will have to exolpre a bit! I understand completely the 52 (or so) youtube videos that you probably watched. Sometimes they have what you want, sometimes they don't! However, it is always satisfying when you are able to produce something that you have taught yourself. Great job!Debra 0 likes

  • HWA

    Perfect bank of solution. 

  • HWA

    great !

  • HWA
    Paul Brandon-Fritzius

    thanks for the quick response. the solution looks good. :)

  • HWA
    tina Johnson

    thnx for the answer. it was perfect. just the way i wanted it. 

  • HWA

    works fine.