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* SM503M-2526PSA01 - Mathematics for Cryptography (INGE-1-INT, INGE-1-BN, INGE-1)
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durée estimée : 15 MinutesThe alphabet contains characters, we use an affine Vigenere's transformation system based on 2x2 matrices .Here are two ciphering keys :1) Among those two keys, only one is correct. Which of the two keys is correct ?2) Calculate the deciphering key corresponding to the correct key.3) Decipher the following bigram : .
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durée estimée : 15 MinutesThe alphabet contains characters, we use an affine Vigenere's transformation system based on 2x2 matrices .Here are two ciphering keys :1) Among those two keys, only one is correct. Which of the two keys is correct ?2) Calculate the deciphering key corresponding to the correct key.3) Decipher the following bigram : .
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The affine ciphering system is used with the previously defined alphabet.So, the used set is The ciphering key is : You have received the ciphered message : " y!usdo ".Decipher this message, you should find an english word composed of 6 characters
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Albert and Bernard choose the Elgamal cryptosystem to communicate. They have the following information:
Public domain : Albert : public key : private key : Bernard : public key : private key : ??Albert wants to send the message to Bernard and chooses . Which couple of values should Albert send ?Your answer will be a couple of numbers. For example, if you think the values are 15 and 9, your answer will be (15,9).View this question
Let , calculate its order in the group.The answer is an integer number.
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durée estimée : 15 MinutesThe alphabet contains characters, we use an affine Vigenere's transformation system based on 2x2 matrices .Here are two ciphering keys :1) Among those two keys, only one is correct. Which of the two keys is correct ?2) Calculate the deciphering key corresponding to the correct key.3) Decipher the following bigram : .
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durée estimée : 15 MinutesThe alphabet contains characters, we use an affine Vigenere's transformation system based on 2x2 matrices .Here are two ciphering keys :1) Among those two keys, only one is correct. Which of the two keys is correct ?2) Calculate the deciphering key corresponding to the correct key.3) Decipher the following bigram : .
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durée estimée : 15 MinutesThe alphabet contains characters, we use an affine Vigenere's transformation system based on 2x2 matrices .Here are two ciphering keys :1) Among those two keys, only one is correct. Which of the two keys is correct ?2) Calculate the deciphering key corresponding to the correct key.3) Decipher the following bigram : .
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In , solve the equation .This equation has either no or several solutions.If this equation has no solution, the answser is 'no solution'.If this equation has several solutions, the answer is a list of integer numbers, separated with commas and no spaces. For example, the solution set for in is 4,11,18
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In calculate the inverse of .The answer is an integer number between 0 et 30If has no inverse, the expected answer is : "no inverse"
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