Information Technologies Deneme Sınavı Sorusu #584553
I. John wants to send a message to Mary. John encrypts the message with a key which is known only by John and Mary. Mary decypts the encrypted message with the same key.II. John wants to send a message to Mary. Mary has a key pair in which one of the keys is known by only Mary and the other one is known by everyone. John encrypts the message with Mary's key which is known by everyone. Mary decrypts the message with her key which is only known by herself.There are two different message sending scenarios above. Which one of the following is the correct pair of cryptographic algorithms appropriate for the scenarios?
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I. Symmetric key cryptography II. Asymmetric key cryptography |
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I. Symmetric key cryptography II. Symmetric key cryptography |
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I. Public key cryptography II. Asymmetric key cryptography |
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I. Asymmetric key crptography II. Public key cryptography |
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I. Public key cryptography II. Symmetric key cryptography |
There are mainly two categories of cryptographic algorithms, symmetric and public key (asymmetric) cryptographic algorithms. Symmetric cryptography uses only one shared key. Sender and receiver agree on a key and encrypts and decrypt the messages using this key, respectively. The same key is used to encrypt and decrypt the data. Contrarily, public key cryptography requires two different keys, private key that is only known by the owner and public key that is delivered anyone freely. Data encrypted by the public key can only be decrypted by its private key counterpart. Correct answer is A.
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