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* SM503M-2526PSA01 - Mathematics for Cryptography (INGE-1-INT, INGE-1-BN, INGE-1)
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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).Anna and Benoît exchange messages using the following coding table for characters.
Moreover, they use as message unit the tetratagrams (blocks of four letters) that they encode as a number in the following way:
For example, the word "TEST" becomes the number .
They use the Elgamal cryptosystem with public domain .
Anna's public and private keys are .
Benoît's public and private keys are .
Anna receives the message from Benoît. To which four-letter word this message correponds to ?
Your answer will be a four-letter word in capital letters.
Consider the set equipped with the commutative and associative binary operation described in the table below:
If is a not group, your answer will be "no".
If is a group, find the order of the element (in this case your answer will be a number).
Anna and Benoît exchange messages using the following coding table.
Moreover, they use as message unit the tetratagrams (blocks of four letters) that they encode as a number in the following
way:
For example, the word "TEST" becomes the number .
They use the Elgamal cryptosystem with public domain .
Anna's public and private keys are .
Benoît's public and private keys are .
Anna receives the message from Benoît. To which four-letter word this message correponds to ?
Your answer will be a four-letter word in capital letters.
Anna and Benoît exchange messages using the following coding table.
Moreover, they use as message unit the tetratagrams (blocks of four letters) that they encode as a number in the following
way:
For example, the word "TEST" becomes the number .
They use the Elgamal cryptosystem with public domain .
Anna's public and private keys are .
Benoît's public and private keys are .
Anna receives the message from Benoît. To which four-letter word this message correponds to ?
Your answer will be a four-letter word in capital letters.