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Cipher MethodsThere are 2 methods of encrypting plaintext:• Bit stream method – every bit in the plaintext bit is transformed into a cipher bit one bit at a time.• Block cipher method – the message is divided into blocks (for example sets of 8-, 16- or32-bit blocks) and then each block of plaintext is transformed into an encrypted block of cipher bits by using an algorithm and a key.Bit stream method which is uses algorithm functions like XOR, while block cipher method can use substitution, transposition, XOR, etc.Substitution cipherSubstitution cipher substitutes one value for the other value. The following are the different types of substitution:• Monoalphabetic substitution – It uses one alphabet to substitute. Simple method but powerful if combines with other operations.• Polyalphabetic substitution – It is more advanced method which uses two or more alphabets.• Vigenère cipher – It is an advanced type of cipher which uses simple polyalphabetic code that is made up of 26 distinct cipher alphabets.Transposition cipherTransposition cipher rearranges values within the block to create ciphertext.Exclusive OR (XOR)It is a function of Boolean algebra where the two bits are compared to each other• If the two bits are identical, result is 0• If the two bits not identical, result is 1Vernam cipherThis is developed at AT&T that uses set of characters once per encryption process.Book (or Running Key) cipherThis method uses text in book as key to decrypt a message where ciphertext contains codes which represents page, line and word numbersHash FunctionsHash functions are mathematical algorithms that generate message summary or digest to confirm message identity and confirm no content has changed. Hash algorithms are publicly known functions that create hash value. Use of keys is not needed, but message authentication code (MAC) may be attached to a message. This method is mostly used in password verification systems to confirm identity of user.
You are provided with 3000 sample keystrokes for 5 users mentioned above. You can find this data using the ‘Lab 2 User Data' link in the ‘Lab 2' folder on Blackboard. Please note t
how would land elevation have canged if coronado had traveled 150 miles due west from what is today arizona instead of west toward new mexico
IPV6 BASE HEADER FORMAT: It has less information than IPV4 message header. Next header shows to first extension message header. Flow label is partitioned into a TRAFFIC CLASS
#ON A lan wher r ip datagrams transported?
You are an IT Security administrator in a banking organization. Your organization hired an outside IT firm to do a proof of Concept for new equipment which is a computer based syst
QUESTION: (a) Suppose the graph below, use the Flow Decomposition method to list the cycles and paths produced. (b) Describe how Lower Bounds on Arc Flows are eliminated
Illustrate about TinySec Protocol TinySec is implemented on the link layer and addresses security requirements of the resource staffed nodes in the WSN based on the link layer
Size of Option field of an ip datagram is 20 bytes. What is the value of HLEN? What is the value in binary?
Problem 1: List measurable entities on which the quality of service in a data communication network depends Problem 2: Show the features of a typical Network Management
PARSING IPv6 HEADERS Base header is fixed in size i.e. 40 octets. NEXT HEADER field in the base header describe kind of header and it seems at end of fixed-size base header. S
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