An X.509 public key certificate with the key usage attribute “non-repudiation” can be used for which of the
following?

What is the maximum allowable key size of the Rijndael encryption algorithm?

Which of the following is not a property of the Rijndael block cipher algorithm?

Which of the following is NOT a property of the Rijndael block cipher algorithm?

Complete the blanks. When using PKI, I digitally sign a message using my ______ key. The recipient verifies
my signature using my ______ key.

Which of the following type of cryptography is used when both parties use the same key to communicate
securely with each other?

The ideal operating humidity range is defined as 40 percent to 60 percent. Low humidity (less than 40 percent)
can produce what type of problem on computer parts?

Which type of encryption is considered to be unbreakable if the stream is truly random and is as large as the
plaintext and never reused in whole or part?

When we encrypt or decrypt data there is a basic operation involving ones and zeros where they are compared
in a process that looks something like this:
0101 0001 Plain text
0111 0011 Key stream
0010 0010 Output
What is this cryptographic operation called?

You are an information systems security officer at a mid-sized business and are called upon to investigate a
threat conveyed in an email from one employee to another.
You gather the evidence from both the email server transaction logs and from the computers of the two
individuals involved in the incident and prepare an executive summary.
You find that a threat was sent from one user to the other in a digitally signed email. The sender of the threat
says he didn’t send the email in question.
What concept of PKI – Public Key Infrastructure will implicate the sender?