Modern ciphers

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  • How many padding bits must be added to a message of 100 characters if 8bit ASCII is used for encoding and the block cipher accepts blocks of 64 bits? Suppose that we have a block cipher where n = 64. If there are 10 1’s in the ciphertext, how many trialanderror tests does Eve need to do to recover the plaintext from the intercepted ciphertext in each of the following cases?

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  • How many padding bits must be added to a message of 100 characters if 8-bit ASCII is used for encoding and the block cipher accepts blocks of 64 bits? 1 MODERN BLOCK CIPHERS Substitution or Transposition ? To be resistant to exhaustive-search attack, a modern block cipher needs to be designed as a substitution cipher. Suppose that we have a block cipher where n = 64. If there are 10 1’s in the ciphertext, how many trial-and-error tests does Eve need to do to recover the plaintext from the intercepted ciphertext in each of the following cases? a. The cipher is designed as a...

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  • USE OF MODERN BLOCK CIPHERS Symmetric-key encipherment can be done using modern block ciphers. Modes of operation have been devised to encipher text of any size employing either DES or AES. Error Propagation A single bit error in transmission can create errors in several in the corresponding block.

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  • USE OF MODERN BLOCK CIPHERS Symmetric-key encipherment can be done using modern block ciphers. Modes of operation have been devised to encipher text of any size employing either DES or AES. 1 USE OF MODERN BLOCK CIPHERS Electronic codebook (ECB) mode Error Propagation A single bit error in transmission can create errors in several in the corresponding block. However, the error does not have any effect on the other blocks.

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  • TRAPDOOR ONE-WAY FUNCTIONThe main idea behind asymmetric-key cryptography is the concept of the trapdoor one-way function. TrapdoorOne-WayFunction(TOWF) One-WayFunction(OWF) 1.fiseasytocompute. 2. f −1 is difficult to compute. 3. Given y and a trapdoor, x can be computed easily.

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  • Threat Discovery Services provides corporatewide traffic threat detection and analysis capabilities via a threat discovery appliance or any VMware-based system. It is deployed out of band at the network layer on the core switch, where it can monitor the stealth techniques being used by modern malware to provide 24 x 7 network monitoring and detection of hidden malware infections. The threat discovery technology detects day-zero infections by leveraging Trend Micro Smart Protection Network and multiple threat analysis engines.

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  • Network Security: Chapter 2 - Symmetric Ciphers includes about Symmetric Encryption, Some Basic Terminology, Symmetric Cipher Mode, Classical Substitution Ciphers, Transposition Ciphers, Product Ciphers, Rotor Machines, Modern Block Ciphers.

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  • Lecture 3: Block ciphers and the data encryption standard. This chapter include objectives: To introduce the notion of a block cipher in the modern context, to talk about the infeasibility of ideal block ciphers, to introduce the notion of the feistel cipher structure, to go over DES and the data encryption standard.

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  • Chapter 7 - Computer and network security. This chapter includes contents: Ancient ciphers to modern cryptosystems; secret-key cryptography; public key cryptography; key agreement protocols; key management; digital signatures; public key infrastructure, certificates and certification authorities; cryptoanalysis; security protocols.

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