Which term is used to describe a password protected encrypted data file that verifies the identity of the sender of a message?
Lesson 7 CIW Internet Security
|digital certificate||a password-protected, encrypted data file that verifies the identity of a sender of a message|
|digital signature||electronic stamp that identifies a message’s source and its contents|
|non-repudiation||ability to prove a transaction occurred|
What term best describes a file of programming code that provides a temporary fix to a known bug?
Which term best describes a file of programming code that provides a temporary fix to a known bug? Patch. You just studied 20 terms!
Which encryption method provides data integrity?
Asymmetric encryption, or public key cryptography, is the core technology that enables PKI and offers data protection in various communication channels. On the other hand, private key encryption, also known as symmetric encryption, is a technique that uses one key for both encryption and decryption.
What best describes symmetric key encryption?
Which statement best describes asymmetric-key encryption? … Which statement best describes symmetric-key encryption? An encryption method in which the same key is used to encrypt and decrypt a message. Your computer crashed, and you lost many personal and work-related files.
What term is used to describe a training session that is delivered over the Internet?
Which term is used to describe a training session that is delivered over the Internet? Webinar.
Which term is used to describe a software application that is secretly placed on a user’s system to gather information and relay IT to outside parties?
Spyware (or adware) is a software application that is secretly placed on a user’s system to gather information and relay it to outside parties, usually for advertising purposes.
Where is symmetric encryption used?
Some of the most common use cases for symmetric cryptography include: Banking: Encrypting credit card information or other personally identifiable information (PII) required for transactions. Data storage: Encrypting data stored on a device when that data is not being transferred.
What are the problems with symmetric key encryption?
While symmetric encryption offers a wide range of benefits, there is one major disadvantage associated with it: the inherent problem of transmitting the keys used to encrypt and decrypt data. When these keys are shared over an unsecured connection, they are vulnerable to being intercepted by malicious third parties.
What is symmetric and asymmetric encryption?
Symmetric encryption uses a single key that needs to be shared among the people who need to receive the message while asymmetric encryption uses a pair of public key and a private key to encrypt and decrypt messages when communicating.
What is DES algorithm in cryptography?
The DES (Data Encryption Standard) algorithm is a symmetric-key block cipher created in the early 1970s by an IBM team and adopted by the National Institute of Standards and Technology (NIST). The algorithm takes the plain text in 64-bit blocks and converts them into ciphertext using 48-bit keys.
What is aes128 encryption?
128-bit AES encryption refers to the process of concealing plaintext data using an AES key length of 128 bits. 128-bit AES encryption uses 10 transformation rounds to convert plaintext into ciphertext and is approved by the National Security Agency (NSA) to protect secret but not top-secret government information.
What is symmetric system?
Symmetric cryptography, known also as secret key cryptography, is the use of a single shared secret to share encrypted data between parties. … In simple terms, the sender encrypts data using a password, and the recipient must know that password to access the data. Symmetric encryption is a two-way process.
What is expansion table in DES?
The expansion function is interpreted as for the initial and final permutations. Note that some bits from the input are duplicated at the output; e.g. the fifth bit of the input is duplicated in both the sixth and eighth bit of the output. Thus, the 32-bit half-block is expanded to 48 bits.
Which type of algorithm DES is?
Data Encryption Standard (DES) is a block cipher algorithm that takes plain text in blocks of 64 bits and converts them to ciphertext using keys of 48 bits. It is a symmetric key algorithm, which means that the same key is used for encrypting and decrypting data.
What is DES Mcq?
This set of Cryptography Multiple Choice Questions & Answers (MCQs) focuses on “The Data Encryption Standard (DES) and It’s Strength”. … In the DES algorithm, although the key size is 64 bits only 48bits are used for the encryption procedure, the rest are parity bits.
What is permutation in DES algorithm?
Bits are permuted as well hence called expansion permutation. This happens as the 32-bit RPT is divided into 8 blocks, with each block consisting of 4 bits. Then, each 4-bit block of the previous step is then expanded to a corresponding 6-bit block, i.e., per 4-bit block, 2 more bits are added.
What is permutation and substitution in DES?
To accomplish encryption, most secret key algorithms use two main techniques known as substitution and permutation. Substitution is simply a mapping of one value to another whereas permutation is a reordering of the bit positions for each of the inputs.
What is substitution DES?
The substitutions are performed by eight substi- tution boxes, or S-boxes. Each S-box has a 6-bit input and a 4-bit output, and there are eight different S-boxes. (The total memory requirement for the eight DES S-boxes is 256 bytes.) The 48 bits are divided into eight 6-bit sub-blocks.
What is inverse initial permutation in DES?
The overall formulas for DES Encryption Algorithm: Li = Ri−1. Ri = Li−1 ⊕ F(Ri−1,__K__i). 6.2 Perform a 32-bit swap on the result of the final round. Then, perform Inverse Initial Permutation (IP−1) on the swapped data to produce the ciphertext 64 bits.
What is AES and DES in encryption?
Definition. AES stands for Advanced Encryption Standard. DES stands for Data Encryption Standard. 2.