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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 EEBB

Decipher the message knowing that the enciphering key is

A : 

 2  1 

 1  4 

B : 

 8 

 7 

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 : " ?naudw ".

Decipher this message, you should find an english word composed of 6 characters
View this question
durée estimée : 15 Minutes

The 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 : .

View this question

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 CDHG

Decipher the message knowing that the enciphering key is

A : 

 4  1 

 5  2 

B : 

 8 

 0 

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 : " iy.fw' ".

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

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 CDIG

Decipher the message knowing that the enciphering key is

A : 

 4  1 

 5  2 

B : 

 4 

 3 

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

View this question

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 AIHC

Decipher the message knowing that the enciphering key is

A : 

 3  2 

 3  3 

B : 

 7 

 5 

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 : " .obvex ".

Decipher this message, you should find an english word composed of 6 characters
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 : " klsshy ".

Decipher this message, you should find an english word composed of 6 characters
View this question
durée estimée : 15 Minutes

The 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 : .

View this question

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