Information Security D430
QUESTIONS AND VERIFIED
CORRECT ANSWERS
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Symmetric Key Algorithms - CORRECT ANSWER-DES
3DES
AES
DES - CORRECT ANSWER-a block cipher based on symmetric key cryptography and uses a 56 -
bit key . Not that secured any more .
3DES - CORRECT ANSWER-DES used to encrypt each block three times , each with a different
key
AES - CORRECT ANSWER-uses three different ciphers : one with a 128 - bit key , one with a 192 -
bit key , and one with a 256 - bit key , all having a block length of 128 bits
Asymmetric cryptography - CORRECT ANSWER-a public key and a private key . The public key is
used to encrypt data sent from the sender to the receiver and is shared with everyone . Private
, keys are used to decrypt data that arrives at the receiving end and are very carefully guarded by
the receive ( aka the public key cryptography )
Asymmetric Key Algorithms - CORRECT ANSWER-Secure Sockets Layer ( RSA )
Elliptic Curve Cryptography ( ECC )
Pretty Good Privacy ( PGP )
Transport Layer Security ( TLS )
Secure Sockets Layer ( RSA ) - CORRECT ANSWER-SSL , to secure transactions like web and e -
mail traffic
Elliptic Curve Cryptography ( ECC ) - CORRECT ANSWER-can secure all browser connections to
the Web servers
Pretty Good Privacy ( PGP ) - CORRECT ANSWER-securing messages and files
SSL ( Secure Socket Layer ) and TLS ( Transport Layer Security ) - CORRECT ANSWER-encryption
protocols that are used to secure the transmission of data over a network . They provide secure
communications by allowing two applications to authenticate each other and by negotiating a
secure , encrypted connection .
Hash Functions - CORRECT ANSWER-Create a largely unique and fixed-length hash value based
on the original message ( input / output )
-Hashes provide integrity , but not confidentiality. It can't un-hash a message
-Hashes are very useful when distributing files or sending communications, as the hash can be
sent with the message so that the receiver can verify its integrity
Keyless cryptography - CORRECT ANSWER-a method of encrypting data that does not use a key .
Instead , it uses mathematical algorithms to secure the information ( hash functions )