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Question:

Please do not copy entirely from internet. If taken help reference it. Work based on Cryptography, Cryptanalysis.

1.Provide brief

  1. What does it mean to “salt” a password?
  2. Name an easy way that a compiler can ensure that buffers do not overflow?
  3. Is 3DES more effective than DES if we use the same key for all 3 stages?
  4. What is a stack canary, and how does it work?
  5. Consider a hash function that creates a 64-bit digest. In the worst case, how many computations are needed to find a weak collision?
  6. This is a question about trust and identity. We discussed one approach to verifying identity, namely an X509v3 certificate.

2.Describe how a certificate is created, what it contains, and how it verifies identity.

a. Make sure you bring out the concept of “root of trust” or root certifier

b. What can happen to trust in an identity if a root certifier is hacked by malicious actors. Provide some examples/specifics

c. An alternate approach to trust is the so-called ring or web of trust, often attributed to Phil Zimmerman, where trust does not flow from a small number of trusted “root” entities. Instead, trust is based on the cumulative support from a large number of entities, each of which is somewhat trusted. How can such an approach be used to defend against the attacks you have described in 2.b?

3.The RSA algorithm is a commonly used algorithm for public key cryptography that we covered in class.

a.Describe the RSA algorithm with all the steps/equations needed to generate a key pair and encrypt a message.

b.Prof I.M. Smart creates a new cloud service for multiplication. It takes two numbers and returns the result of multiplying them. They claim that you can send them the numbers to be multiplied encrypted by a suitable algorithm, and they will return the product to you encrypted as well. In other words, you send them E(x1) and E(x2), and the value they return to you will be E(x1*x2). You can then decrypt this value to get the product, and Prof. Smart’s service will have no idea what numbers you multiplied! One of the asymmetric encryption algorithms we studied in class has this property. Say which one, and show the math that makes E(x1)*E(x2) = E(x1*x2) for that particular Encryption function E.

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