Questions

• Some cyphers need an initialization vector, what do we populate it with?

does a symmetric cypher need a key? If so why

• is the same key used to encipher and decipher the file?

• Based on what I understand about ensuring message integrity and preventing messages from being repudiated by their original sender, we use asymmetric encryption, and sign our messages using one of the two keys of our keypair. Which of the two do we use for the signature? Do we incorporate asymmetric keys in our homework? Or could I use a symmetric to sign the cryptographic hash of the message

• Diffy-Hellman allows for the exchange of encryption keys to take place securely through a public channel, can we whiteboard this process together? It's a little hazy

• What is the relationship between cryptographic keys certificate and signatures? Does one use the certificate to encrypt? It's a little confusing I'm used to RSA

• Is there an AES mode that doesn't require an initialization vector?

• Would using the digest of the plaint text file as the initialization vector be insecure?

• While the semester is still in the early stages, I wanted to go over my grade to see if I needed to reconcile any omitted entries, can you confirm I'm not missing participation for lectures thus far

• We've covered a lot of attacks in this class, what's an example of a question we might be asked on a midterm related to these attack

• Will we be given a list of attacks we should be expected to know

Forward privacy: if my current key is leaked, it will only reveal anything that happened in the future.

Final exam is multiple choice.

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