Is it possible to perform encryption operations in parallel on multiple blocks of plain- text in CBC mode? How about decryption?
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- Assume that you have a suitable source of randomness which can produce at least 264264 random bits before it repeats. What is the easiest way to turn this into a stream cipher suitable for encrypting long streams of plaintext?Encrypt the 12-bit plaintext 101010100111 using Simplified B-DES and the 9-bit key K = 010001111. This is a non-computer problem and you need to show all the steps of the encryption processIs it possible to perform encryption operations in parallel on multiple blocks of plaintext in CBC mode? Explain your answer clearly!
- Suppose we will use Advanced Encryption Standard (AES) to encrypt a block of plaintext and the known round key for round 7 is: B5 8D BA D2 31 2B F5 60 7F 8D 29 2F EA D2 73 21 What is the third word (i.e. the third 4 bytes) of the round key for round 8?Consider CBC-mode encryption with a block cipher having a 256-bit key and 128-bit block length to encrypt a 1024-bit message. What is the length of the resulting ciphertext? Does your answer change if the key size is 128 bits?Would it be possible to execute encryption functions in parallel on CBC mode with multiple blocks of messages? How about Decryption?
- Answer the following question: Give the pros and cons for block size as it relates to the Feistel CipherSuppose a message is 5000 bits long. If it is to be encrypted using a block cipher of 64 bits, find both the size of the padding and the number of blocks needed.Your professor asked you to encrypt the plaintext bits: 1000 0111 with key bits: 00100 10111(after parity drop) using S- DES, where the block size is 8 bits and round key generator input size 10 bits and output size 8 bits. Use the following S- boxes and P-boxes for encryption. Perform one left shift. 1 IP 2 63 148 5 IP-1 4 572 8 6 0123 0 [1032] SO-1 3 2 10 2021 3 3 313 P10 41019 8 6 0 S1-1 2 3 6 E/P 2 2 4 0123 0 1 2 3] |2 0 13 30 10 103 P8 4 8 3 2 P4 3 5 10 9
- Is it possible to perform encryption operations in parallel on multiple blocks of plaintext in CBC mode? How about decryption? Using the RSA algorithm, perform encryption and decryption for the following: P=7; q=11, e=17; M = 8 P=17; q=31, e=7; M=2We use DES in cipher feedback mode (CFB) to encrypt a plaintext m = m1m2 ...m100 into a ciphertext c1c2 ...c100, where each mi is 8-bit long. The ciphertext is sent to Bob. If c15 and c25 are missing and c8 and c88 are received as c8' and c88' wrongly, what mi’s can B compute correctly from the received ciphertext?Suppose we use a new block cipher, which looks similar but different from CTR mode, to encrypt plaintexts according to the following rules: C_0 = IV XOR E(P_0, K), C_1 = (IV+1) XOR E(P_1, K), C_2 = (IV+2) XOR E(P_2, K) Using the corresponding decryption rules, please write out P_0, P_1, P_2, respectively.