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* SM503M-2526PSA01 - Mathematics for Cryptography (INGE-1-INT, INGE-1-BN, INGE-1)

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In calculate the inverse of .

The answer is an integer number between 0 et 26

If has no inverse, the expected answer is : "no inverse"
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what is the value of : ?
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what is the value of : ?
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What is the (u,v) couple computed by the Extended Euclid algorithm such that :

879.u+756.v = pgcd(879,756) ?

The answer should be a (u,v) couple of integer numbers. For example, if you have found that u = 31 and v = -12, the expected answer is (31,-12)
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What is the (u,v) couple computed by the Extended Euclid algorithm such that :

2264.u+2208.v = pgcd(2264,2208) ?

The answer should be a (u,v) couple of integer numbers. For example, if you have found that u = 31 and v = -12, the expected answer is (31,-12)
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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 : " z?rktr ".

Decipher this message, you should find an english word composed of 6 characters
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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 EIIA

Decipher the message knowing that the enciphering key is

A : 

 3  2 

 4  3 

B : 

 7 

 6 

Your answer will be a four letters word written in capital letters with no spaces.

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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 : " !dgcde ".

Decipher this message, you should find an english word composed of 6 characters
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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 EDEB

Decipher the message knowing that the enciphering key is

A : 

 6  1 

 1  7 

B : 

 5 

 2 

Your answer will be a four letters word written in capital letters with no spaces.

View this question
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 : " jaqxrk ".

Decipher this message, you should find an english word composed of 6 characters
View this question

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