Explain two general approaches to attacking a cipher
Problem:
Question 1: What are the two general approaches to attacking a cipher?
Question 2: Why is the middle portion of 3DES a decryption rather than an encryption?
Describe in detail two general approaches to attacking a cipher.
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With the ECB mode, if there is an error in a block of the transmitted cipher text, only the corresporrding plaintext block is affected. However, in the CBC mode, this error propagates.
Question 1: What are the two general approaches to attacking a cipher? Question 2: Why is the middle portion of 3DES a decryption rather than an encryption?
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Let the language L be accepted by the transition graph T and let L not contain the word ba. We want to build a new TG that accepts exactly L and the word ba. One suggestion is to draw an edge from - to + and label it ba show that this does not always
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