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Extra resources for A canonical Frobenius structure

Sample text

In the case above, if Alice were the only person who could solve a Rubik’s cube, then that could be her puzzle. In this scenario Bob is the verifier and is identifying Alice, the prover. The idea is to associate with each person something unique; something only that person can reproduce. This in effect takes the place of a face or a voice, which are unique factors allowing people to identify one another in the physical world. Authentication and identification are different. Identification requires that the verifier check the information presented against all the entities it knows about, while authentication requires that the information be checked for a single, previously identified, entity.

A chosen-ciphertext attack is one in which cryptanalyst may choose a piece of ciphertext and attempt to obtain the corresponding decrypted plaintext. This type of attack is generally most applicable to public-key cryptosystems. An adaptive-chosen-ciphertext is the adaptive version of the above attack. A cryptanalyst can mount an attack of this type in a scenario in which he has free use of a piece of decryption hardware, but is unable to extract the decryption key from it. 2). 3. What is exhaustive key search?

There are a variety of threat models that depend on different assumptions about the data that might be collected. For example, can an adversary control the messages whose MACs are obtained, and if so, can the choice be adapted as more data is collected? Depending on the design of the MAC there are a variety of different attacks that might apply. Perhaps the most important class of attacks is due to Preneel and van Oorschot [PV95]. 6) to the analysis of message/MAC pairs and the attacks have been particularly useful in highlighting structural faults in the design of many MACs.

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