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* SM503M-2526PSA01 - Mathematics for Cryptography (INGE-1-INT, INGE-1-BN, INGE-1)
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To communicate between them, Anaïs and Bastien use an alphabet of only ten letters:
a = 0, b = 1, c = 2, d = 3, e = 4, f = 5, g = 6, h = 7, i = 8, j = 9.
To encipher their messages, they decide to use the generalised Vigenère cipher on bigrams.
Bastien receives from Anaïs the ciphertext EIBE
Decipher the message knowing that the enciphering key is
A :
3 2
3 3
B :
5
5
Your answer will be a four letters word written in capital letters with no spaces.
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).