Cryptography

What is an important disadvantage of using a public key algorithm compared to a symmetric algorithm?

• Asymmetric algorithm provides better access control.

• Asymmetric algorithm is a faster process.

• Asymmetric algorithm provides nonrepudiation of delivery.

• Asymmetric algorithm is more difficult to implement.

When a user needs to provide message integrity, what options may be best?

• Send a digital signature of the message to the recipient

• Encrypt the message with a symmetric algorithm and send it

• Encrypt the message with a private key so the recipient can decrypt with

  the corresponding public key

• Create a checksum, append it to the message, encrypt the message, then

  send to recipient.

The two methods of encrypting data are?

• Substitution and transposition

• Block and stream

• Symmetric and asymmetric

• DES and AES

Cryptography supports all of the core principles of information security except

• Availability

• Confidentiality

• Integrity

• Authenticity

The only cipher system said to be unbreakable by brute force is

• AES

• DES

• One-time pad

• Triple DES

Data that is in an unencrypted form is referred to as which of the following?

• plain text

• crypt text

• cleartext

• simpletext

In which type of encryption is the same key used to encrypt and decrypt data?

• public

• asymmetric

• symmetric

• private

What alternative term can be used to describe asymmetric cryptographic algorithms?

• public key cryptography

• user key cryptography

• private key cryptography

• cipher-text cryptography

What type of cryptography uses two keys on both ends i.e a private and a public key?

• shared

• asymmetric

• symmetric

• open

Plaintext

• original message

• coded message

• algorithm for transforming plaintext to ciphertext

• info used in cipher known only to sender/receiver