Alice sends Bob a plaintext message M and its digital signature S, signed with Alice’s private key. However, Eve intercepts M and S before it gets to Bob, and then passes M’ and S’ on to Bob. We do not know what Eve may have done while intercepting the message. Bob, taking the message and signature that he received, uses Alice’s public key (which he already had beforehand). Bob is able to verify that S’ is the valid signature for M’. Which of the following should be true? (Select all that apply)

With IPv6, NAT (network address translation) is no longer necessary.

The initialization vector (IV) of block cipher modes (such as AES-CBC) must be kept secret, along with the block cipher secret key.

A secure cryptographic hash function is collision-free.

Use the following table of exchange rates to solve the problem. Round your answer when appropriate. How many Mexican pesos can you buy for $120?

Your laptop is trying to connect to a printer on the local WiFi network, and it knows the printer’s local IP address. To do so, your laptop uses DHCP to determine the printer’s MAC address from its IP address.

Use the compound interest formula for compounding more than once a year to determine the accumulated balance after the stated period.$5,500 deposit at an APR of 5% with monthly compounding for 6 years

Use the compound interest formula to determine the accumulated balance after the stated period. Assume that interest is compounded annually.$8,000 is invested at an APR of 2.8% for 4 years.

Say that we are computing a shared secret using the Diffie-Hellman key exchange algorithm, with the following parameters: g=309, p=541, a=5, b=7 Write the equation for what the shared secret s should be (use the actual numbers rather than variables).  An example equation could be s = 3821 mod 52. s=?

Let’s say a coffee shop’s WiFi router deploys WPA2 Personal. For the KeyCounter shared with a new client, it uses the current timestamp (in seconds). It also has a WiFi password that one can get after buying a cup of coffee. Eve just got to the coffee shop and bought a coffee. She notices another customer, Alice, surfing the web on her laptop. Eve saw Alice enter the coffee shop a few minutes before her (but at the time, Eve was far away, definitely out of WiFi signal range). Can Eve possibly figure out the WPA2 secret key used to encrypt the traffic between Alice’s laptop and the WiFi access point? Explain why or why not.