• #### 1.  Key

• algorithm for transforming plaintext to ciphertext
• info used in cipher known only to sender/receiver
• •recovering ciphertext from plaintext
• •converting plaintext to ciphertext
• #### 2.  Authentication

• Ensure message remains secret during transmission between parties
• Ensure message is not altered while in transit between communicating partners
• Verifies sender is who she says she is
• Proves that nobody but on sender could have sent a particular message
• #### 3.  Cipher

• •study of principles/methods of deciphering ciphertext without knowing key
• •converting plaintext to ciphertext
• •coded message
• algorithm for transforming plaintext to ciphertext

• Ciphertext
• Cipher
• Plaintext
• Algorithm

• Sifr
• Cipher
• Encryption
• Plaintext
• #### 6.  Decipher

• original message
• algorithm for transforming plaintext to ciphertext
• recovering plaintext from ciphertext
• •field of both cryptography and cryptanalysis
• #### 7.  This is a mathematical procedure for performing encryption

• Cipher
• Algorithm
• Substitution
• Transposition

• Ciphertext
• Plaintext
• Algorithm
• Cipher
• #### 9.  This method of encryption is the replacement of an item with a different item.

• Transposition
• Confusion
• Substitution
• Diffusion
• #### 10.  Confidentiality

• Ensure message remains secret during transmission between parties
• Ensure message is not altered while in transit between communicating partners
• Verifies sender is who she says she is
• Proves that nobody but on sender could have sent a particular message

• Work Factor
• Cipher
• Keyspace
• Keyfactor
• #### 12.  Encipher

• converting plaintext to ciphertext
• coded message
• •study of principles/methods of deciphering ciphertext without knowing key
• study of encryption principles/methods

• True
• False
• #### 14.  Integrity

• Ensure message remains secret during transmission between parties
• Ensure message is not altered while in transit between communicating partners
• Verifies sender is who she says she is
• Proves that nobody but on sender could have sent a particular message
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