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10 Cards in this Set
- Front
- Back
- 3rd side (hint)
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What are three fundamental approaches to proof of possession of secret?
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One-time password, encryption (symmetric secret or public key), or hashing (message authentication code).
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The hash mechanism that provides integrity.
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Message Authentication Code (MAC) and Message Integrity Code (MIC)
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What is the pseudocode for a MAC?
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Msg, nonce, hash(PW , Msg , nonce)
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Can you use an encryption function as a hashing function?
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Yes, but you must throw something away.
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What is the probability of a hash collision of message M2 with message M1 using an n bit hash?
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1 / (2^n)
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How many messages would have to be generated to raise the probability of a hash between any two to ~50%?
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2^(n-1) / 2^n
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[Cryptool] Look at the “grids” representing a plaintext block and the cipher key. How many bits comprise an AES block?
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16 blocks * 2 hex chars * 4 bits per hex char = 128
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[Cryptool] How many total AES rounds are there per plaintext block?
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10
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(Note: In class lecture I refer to this concept more generally as iterations. This may be a bit confusing as the presentation confuses the issue a bit. Specifically, do we count the initial round or not? The answer is no, they don’t count the initial round in the total number of rounds.)
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[Cryptool] What does the ‘S’ in “S-Box” stand for?
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Substitution
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(Note: you find the same kind of thing in the DES algorithm, and others)
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[Cryptool] What is the primary source of obscuring the relationship between columns and rows in Rijndael?
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diffusion
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