Matlab:Please write the codes, I do not want a manual solution Cryptography, at its most fundamental level, requires two steps: encryption and decryption. The encryption process uses a cipher in order to encrypt plaintext and turn it into ciphertext.Decryption, on the other hand, applies that same cipher to turn the ciphertext back into plaintext.One of the simplest forms of encryption known as shift cipher. With this cipher, we simply shift each letter a set number of spaces up or down the alphabet.a bcd.hij kIemnpruVXyZLetters shifted by 4 positions.yadefgiikm| npruVWrite a function which encrypts a lowercase word by using shift cipher algorithm. The name of the function should be ShiftCipherEncrypt. It has two input arguments (s) and (n), one outputargument (t).The input argument (s) should be the text to be encrypted.The input argument (n) should be equal to the number of positions to be shifted.The output argument (f) should be the text which is encrypted.Examples:s= 'basic' , n = 1 , t = 'azrhb's = 'computer' , n = 3 , t = 'zljmrqbo's= 'programming' , n = 5 , t = 'kmjbmvhhdib'

below we make a algo to this question,

Decryption, on the other hand, applies that same cipher to turn the ciphertext back into plaintext. One of the simplest forms of encryption known as shift cipher. With this cipher, we simply shift each letter a set number of spaces up or down the alphabet. def ghij k|| mn op a q u V X y Letters shifted by 4 positions. | z a bcd efgh i jkI mnop qrst uv y Write a function which encrypts a lowercase word by using shift cipher algorithm. The name of the function should be ShiftCipherEncrypt. It has two input arguments (s) and (n), one output argument (t). The input argument (s) should be the text to be encrypted. The input argument (n) should be equal to the number of positions to be shifted. The output argument (t) should be the text which is encrypted. Examples: s = 'basic' , n = 1 , t = 'azrhb s = 'computer' , n = 3 , t = 'zljmrqbo' s = "programming' , n = 5 , t = 'kmjbmvhhdib'

Decryption, on the other hand, applies that same cipher to turn the ciphertext back into plaintext. One of the simplest forms of encryption known as shift cipher. With this cipher, we simply shift each letter a set number of spaces up or down the alphabet. def ghij k|| mn op a q u V X y Letters shifted by 4 positions. | z a bcd efgh i jkI mnop qrst uv y Write a function which encrypts a lowercase word by using shift cipher algorithm. The name of the function should be ShiftCipherEncrypt. It has two input arguments (s) and (n), one output argument (t). The input argument (s) should be the text to be encrypted. The input argument (n) should be equal to the number of positions to be shifted. The output argument (t) should be the text which is encrypted. Examples: s = 'basic' , n = 1 , t = 'azrhb s = 'computer' , n = 3 , t = 'zljmrqbo' s = "programming' , n = 5 , t = 'kmjbmvhhdib'

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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In cryptography, a Caesar cipher is a very simple encryption techniques in which each letter in the plain text is replaced by a letter some fixed number of positions down the alphabet. For example, with a shift of 3, A would be replaced by D, B would become E, and so on. The method is named after Julius Caesar, who used it to communicate with his generals. ROT-13 (“rotate by 13 places”) is a widely used example of a Caesar cipher where the shift is 13. In Python, the key for ROT-13 may be represented by means of the following dictionary: key = {‘a’:’n’, ‘b’:’o’, ‘c’:’p’, ‘d’:’q’, ‘e’:’r’, ‘f’:’s’, ‘g’:’t’, ‘h’:’u’,‘i’:’v’, ‘j’:’w’, ‘k’:’x’, ‘l’:’y’, ‘m’:’z’, ‘n’:’a’, ‘o’:’b’, ‘p’:’c’,‘q’:’d’, ‘r’:’e’, ‘s’:’f’, ‘t’:’g’, ‘u’:’h’, ‘v’:’i’, ‘w’:’j’, ‘x’:’k’,‘y’:’l’, ‘z’:’m’, ‘A’:’N’, ‘B’:’O’, ‘C’:’P’, ‘D’:’Q’, ‘E’:’R’, ‘F’:’S’,‘G’:’T’, ‘H’:’U’, ‘I’:’V’, ‘J’:’W’, ‘K’:’X’, ‘L’:’Y’, ‘M’:’Z’, ‘N’:’A’,‘O’:’B’, ‘P’:’C’, ‘Q’:’D’, ‘R’:’E’, ‘S’:’F’, ‘T’:’G’, ‘U’:’H’, ‘V’:’I’,‘W’:’J’, ‘X’:’K’,…
Affine Cipher is an example of a Monoalphabetic substitution cipher. The encryption process is substantially mathematical done by using the following formula: C = (P ∗ ?1 + ?2) mod 26. Where k1, k2 are two integers representing the key (selected randomly), C is the ciphertext value, and P is the plaintext value. Where C and P integers with values between 0 and 25. Write an Octave programme to implement this system, run your programme using the Plaintext: “the quick brown fox jumped over the lazy dog”. Show the obtained ciphertext with the selected values of the keys k1 & k2. Given that the plaintext “s” mapped to ciphertext “W”, plaintext “x” mapped to ciphertext “Z” when encrypted with Affine Cipher. Determine, mathematically, the values for the two keys K1 and K2.
Affine Cipher is an example of a Monoalphabetic substitution cipher. The encryption process is substantially mathematical done by using the following formula: C = (P ∗ ?1 + ?2) mod 26. Where k1, k2 are two integers representing the key (selected randomly), C is the ciphertext value, and P is the plaintext value. Where C and P integers with values between 0 and 25. 1) Write an Octave programme to implement this system, run your programme using the Plaintext: “the quick brown fox jumped over the lazy dog”. Show the obtained ciphertext with the selected values of the keys k1 & k2. 2) Given that the plaintext “s” mapped to ciphertext “W”, plaintext “x” mapped to ciphertext “Z” when encrypted with Affine Cipher. Determine, mathematically, the values for the two keys K1 and K2. I need an octave code for the first part of this question, that i can just copy and paste. In addition, to an explanation of the steps done to…
Introductory: The Caesar Cipher technique is one of the earliest and simplest methods of encryption techniques. It is simply a type of substitution cipher, i.e., each letter of a given text is replaced by a letter some fixed number of positions down the alphabet. For example, with a shift of 1, A would be replaced by B, B would become C, and so on. The method is apparently named after Julius Caesar, who apparently used it to communicate with his officials. Thus, to cipher a given text we need an integer value, known as a shift which indicates the number of positions each letter of the text has been moved down. The encryption can be represented using modular arithmetic by first transforming the letters into numbers, according to the scheme, A = 0, B = 1 ,…, Z = 25. Encryption of a letter by a shift n can be described mathematically as. En(x) = (x+n) mod 26 (Encryption Phase with shift n) Write an algorithm and implement a program in C to read the data from a file (called…
A Caesar cipher is a simple substitution cipher based on the idea of shiftingeach letter of the plaintext message a fixed number (called the key) ofpositions in the alphabet. For example, if the key value is 2, the word"Sourpuss" would be encoded as "Uqwtrwuu." The original message canbe recovered by "reencoding" it using the negative of the key. Write a program that can encode and decode Caesar ciphers. The in-put to the program will be a string of plaintext and the value of the key. The output will be an encoded message where each character in the orig-inal message is replaced by shifting it key characters in the Unicode char-acter set. For example, if ch is a character in the string and key is the amount to shift, then the character that replaces ch can be calculated as:chr (ord(ch) + key) .
A Caesar cipher is a simple substitution cipher based on the idea of shiftingeach letter of the plaintext message a fixed number (called the key) ofpositions in the alphabet. For example, if the key value is 2, the word"Sourpuss" would be encoded as "Uqwtrwuu." The original message canbe recovered by "reencoding" it using the negative of the key.Write a program that can encode and decode Caesar ciphers. The input to the program will be a string of plaintext and the value of the key.The output will be an encoded message where each character in the original message is replaced by shifting it key characters in the Unicode character set. For example, if ch is a character in the string and key is theamount to shift, then the character that replaces ch can be calculated as:chr (ord(ch) + key) .
Using public key cryptography, X adds a digital signature s to message M, encrypts <M, s>, and sends it to Y, where it is decrypted. Which one of the following sequences of keys is used for the operations? A) Encryption: X's private key followed by Y's private key; Decryption: X's public key followed by Y's public key B) Encryption: X's private key followed by Y's public key; Decryption: X's public key followed by Y's private key C) Encryption: X's public key followed by Y's private key; Decryption: Y's public key followed by X's private key D) Encryption: X's private key followed by Y's public key; Decryption: Y's private key followed by X's public key
A rotation cipher is one of the simplest, plain-text ciphers, known since at least the time of Julius Then a rotation of 3 means that the first three letters of the alphabet are moved to the end of the sequence, while the other letters move up, as shown below. Notice that the movement is done one letter at a time. a b c d e f g h i j k l m n o p q r s t u v w x y z 23 24 25 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 A cipher is created by using the rotated alphabet to replace each letter in the original string with its rotated equivalent letter. Using the example above, the word “this” is translated as follows: • the ‘t’ is found at index 19 in the alphabet. The letter in the rotated alphabet is ‘w’. • the ‘h’ is found at index 7, the rotated letter is ‘k’ • the ‘i’ is found at index 8, the rotated letter is ‘l’ • the ‘s’ is found at index 18, the…
Construct an experiment to estimate the speed at which a particular computer can process an authentication password. From that estimate, determine how long it would take to test common password candidate lists, such as a list of 100 or 1000 popular passwords, the same list enhanced with orthographic substitutions (3 for e, zero for O, one for l, 2 for z, and so forth), and a word list from a common online dictionary.
IN JAVA PROGRAMMING LANGUAGE PLEASE , DO THE ENCRYPTION AND DECRYPTION FOR THIS CIPHER BUT USING THIS SOLUTION IN THE IMAGE AND NOT THE ONES ON THE INTERNET PLEASE I WANT THE RESULT OF ENCRYPTION TO BE THE SAME AS THE IMAGE AND FOR THE DECRYPTION TO GIVE THE SAME ORIGINAL MESSAGE
Substitution Cipher is an old technique that substitutes one thing for another. For example, alphabet messages can be ciphered by applying the following substitution. plaintext: abcdefghijklmnopqrstuvwxyz | | V Vciphertext: mnbvcxzasdfghjklpoiuytrewq However, this type of ciphering produces patterns since the same plaintext strings produce the same cipher text. Polyalphabetic Cipher, on the other hand mitigates this problem as plaintext characters are not always replaced with the same cipher text character. The replacement of each character dependson a key as well as on the position of the character in the text; for example, by using a formula such as: for (int i=0; i < length of P; i++) C[i] = P[i] + K + (i mod 3) In essence, if the key, K, is choses as K=10, then 10 is added to characters in position 0, 3, 6, …; and 11 is added for those in…
Substitution ciphers are encryption/decryption algorithms that replace one letter or number with another. The first attested use of a substitution cipher in military affairs was by Julius Caesar, described by him in Gallic Wars (cf. Kahn pp83-84). In caesar cipher , you replace each letter by 3rd letter on. If it is out of bound (later than Z), then round to the head (letter A) and continue the shift. For example:meet me after the toga party PHHW PH DIWHU WKH WRJD SDUWB Please write a program in Java to implement the Caesar Cipher: a. Implement the encryption algorithm. Ask the user to input one all lower case normal sentence (called plaintext) using the nextLine method, and then output the encrypted text (called ciphertext). b. Implement the decryption algorithm. Ask the user to input one encrypted sentence (i.e. ciphertext) using the nextLine method, and then output the decrypted text (i.e. plaintext).