how many blocks will be generated out of 320 bit plaintext message when encrypted using DES ? What is size of final cipher text ? a) 5 and 256 b) 4 and 320 c) 5 and 320 d) 4 and 256
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how many blocks will be generated out of 320 bit plaintext message when encrypted using DES ? What is size of final cipher text ?
a) 5 and 256
b) 4 and 320
c) 5 and 320
d) 4 and 256
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- Explain briefly how the hybrid approach should be used to encrypt a long message.When block ciphers are used to encrypt more than a single block of plaintext, a specific mode is employed. Explain in detail the two most common modes: Electronic Codebook (ECB) and Cipher Block Chaining (CBC). [9 marks] b. List issues that are addressed by the other modes.N blocks of plaintext (P1 to PN) are being encrypted in CBC mode into ciphertext blocks (C1 to CN). Assume that two bits of C3 and one bit of C6 are erroneous (their binary values have flipped). Determine what blocks of the plaintext will be affected and how
- Assume RSA encryption. Use n = 1147 and e = 49 to encrypt a short message of your choice (just one word or two short words).1. Symmetric Encryption and Message Confidentiality: a) Figure 2 shows the Cipher Block Chaining (CBC). There is an error in the transmitted Ciphertext no 1. i) Is there any block further than P1 is affected? ii) Suppose there is a bit error in the source version of P1. Through how many ciphertext blocks is this error propagated? What is the effect on the receiver? iii) Identify which decrypted plaintext blocks Px will be corrupted if there is an error in block C4 of the transmitted ciphertext.Using the transposition cipher technique, decrypt the following message: EENRE*ERTEA*GRS The message was encrypted using a grid of 3 by 5 (3 rows, 5 columns) by spiraling inward from the top right of the grid moving clockwise.
- What is the biggest advantage of CBC mode of operation a. It does not need Initialization Vector (IV) b. A cipher text block depends on all blocks before it c. It does not propagate errors in the cipher text d. It can encrypt in parallel different parts of the messages11. In OFB Transmission errors do not propagate: only the current ciphertext is affected, since keys are generated “locally”. i) True ii) FalseA message has 2000 characters. If it is to be encrypted using a block cipher of 128 bits, find the size of the padding and the number of blocks.
- q3- With the ________ mode if there is an error in a block of the transmitted ciphertext only the corresponding plaintext block is affected a- Electronic Code book Mode (ECB) b- Cipher Feedback Mode (CFB) c- Cipher Block Chaining Mode (CBC) d- Output Feedback Mode (OFB)Only after the communication is encrypted can the digital signature be computed. True or False?Many block cipher modes require an IV.The IV is required both for encryption and decryption.If Alice sends Bob a message encrypted in a block cipher mode that uses an IV, how can Bob know the IV?If you know of multiple secure solutions, please mention them all..