CTNC Exam Questions & Answers 2024/2025
allows you to maintain confidentiality of data by converting plain text information into cipher text - ANSWERSEncryption
Method of cryptography that involves substituting one character for another. - ANSWERSSubstitution Cipher
Method of cryptograph...
allows you to maintain confidentiality of data by converting plain text information into cipher text -
ANSWERSEncryption
Method of cryptography that involves substituting one character for another. - ANSWERSSubstitution
Cipher
Method of cryptography that involves substituting one character for another. - ANSWERSTransposition
Cipher
used to maintain the integrity of the information. goal is to prove that the information has not been
altered - ANSWERSHashing
This services is a method for cryptography to prove the creator, or the sender of information, is who it
says it is. - ANSWERSAuthentication
the mathematical operation performed on the data to convert the data from plain text to cipher text (or
vice versa). - ANSWERSAlgorithm
a variable piece of information that is used by the encryption algorithm to perform the encryption or
decryption of the data. - ANSWERSKey
algorithms encrypt data one bit at a time. - ANSWERSStream Cipher
algorithms encrypt data in blocks. - ANSWERSBlock Cipher
ones, all zeros, or a combination of ones and zeros must be added to the last block to complete the data
stream. - ANSWERSPadding
, if one, and only one, of two bits being compared has a value of 1, then the result is a 1 for that
calculated bit. - ANSWERSXOR
common encryption method that involves using the same key to encrypt and decrypt the message. -
ANSWERSSymmetric encryption
name stems from the fact that you need to share the key with the person who is going to decrypt the
information. - ANSWERSpreshared key
name comes from the fact that you must keep the key secret from others who should not decrypt the
information. - ANSWERSSecret key
name comes from the fact that many implementations of symmetric encryption use a random key,
known as a session key to do the encryption/decryption. - ANSWERSSession Key
name comes from the fact that you need to keep the key private to only the parties who are to decrypt
the information; otherwise, you lose confidentiality. - ANSWERSPrivate key
block cipher. 56-bit encryption algorithm. It is not considered secure. - ANSWERSData Encryption
Standard (DES)
block cipher algorithm to replace the DES algorithm. It offers variable rates of encryption, from 1- to 448-
bit encryption. - ANSWERSBlowfish
created after Blowfish and offers 128-bit encryption. - ANSWERSTwofish
RC5 is a block cipher. RC4, which is a stream cipher used in SSL and WEP. - ANSWERSRivest Cipher
replaced 3DES as the new standard for symmetric encryption algorithms. block cipher that supports 128-
bit, 192-bit, and 256-bit encryption. - ANSWERSAdvanced Encryption Standard (AES)
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