Here is a list of features of a block cipher mode. select all that apply to the cbc mode
Encryption algorithms are divided into two categories based on the input type, as a block cipher and stream cipher. Block cipher is an encryption algorithm that takes a fixed size of input say b bits and produces a ciphertext of b bits again. If the input is larger than b bits it can be divided further. For different applications and uses, there are several modes of operations for a block cipher. Show Electronic Code Book (ECB)
– Procedure of ECB is illustrated below: Advantages of using ECB –
Disadvantages of using ECB –
Cipher
Block Chaining – The process is illustrated here: Advantages of CBC –
Disadvantages of CBC –
Cipher Feedback Mode (CFB) – Advantages of CFB –
Output Feedback Mode – Advantages of OFB –
Counter Mode – Its simple implementation is shown below: Advantages of Counter –
Is CBC a block cipher?Cipher block chaining (CBC) is a mode of operation for a block cipher -- one in which a sequence of bits are encrypted as a single unit, or block, with a cipher key applied to the entire block. Cipher block chaining uses what is known as an initialization vector (IV) of a certain length.
What are the five modes of operation of block cipher?Block Cipher Modes
As summarized on the Current Modes page, there are eight confidentiality modes (ECB, CBC, OFB, CFB, CTR, XTS-AES, FF1, and FF3), one authentication mode (CMAC), and five combined modes for confidentiality and authentication (CCM, GCM, KW, KWP, and TKW).
What is block cipher in CNS?A block cipher is a method of encrypting data in blocks to produce ciphertext using a cryptographic key and algorithm. The block cipher processes fixed-size blocks simultaneously, as opposed to a stream cipher, which encrypts data one bit at a time.
Which of the following is a characteristic of block ciphers?Block ciphers encrypt plaintext one bit at a time to form a block. Block ciphers result in output data that is larger than the input data most of the time. Block ciphers result in compressed output. Block ciphers are faster than stream ciphers.
|