Lab: Caesar Cipher implementation with Python letters='ABCDEFGHIGKLMNOPQRSTUVWXYZ KEY=3 def caesar_encrypt(plain_text): cipher_text=" plain_text= plain_text.upper() for I in plain text: index= letters.find(1) index = (index + KEY) % len(letters) cipher_text= cipher_text + letters[index] return cipher_text def caesar decrypt(cipher_text): plain_text=" for I in cipher_text: index= letters.find(1) index= (index - KEY) % len(letters) plain_text= plain_text + letters[index] return plain_text if name =='__main__': message = 'Welcome to my Cryptography class' encrypted_message = caesar_encrypt(message) print(encrypted_message) print(caesar_decrypt(encrypted_message)) In the previous page, we define letters as 'ABCDEFGHIGKLMNOPQRSTUVWXYZ to obtain the index of a character in encryption and decryption. The characters in the plain text and the cipher text have to be from 'ABCDEFGHIGKLMNOPQRSTUVWXYZ". In this lab, try to modify the code in the previous page to allow your python code to handle any characters in in the plain text and the cipher text Hint: use ASCII index(value) to represent a character. The python method which returns the ACSII index is ord().

Lab: Caesar Cipher implementation with Python letters='ABCDEFGHIGKLMNOPQRSTUVWXYZ KEY=3 def caesar_encrypt(plain_text): cipher_text=" plain_text= plain_text.upper() for I in plain text: index= letters.find(1) index = (index + KEY) % len(letters) cipher_text= cipher_text + letters[index] return cipher_text def caesar decrypt(cipher_text): plain_text=" for I in cipher_text: index= letters.find(1) index= (index - KEY) % len(letters) plain_text= plain_text + letters[index] return plain_text if name =='main': message = 'Welcome to my Cryptography class' encrypted_message = caesar_encrypt(message) print(encrypted_message) print(caesar_decrypt(encrypted_message)) In the previous page, we define letters as 'ABCDEFGHIGKLMNOPQRSTUVWXYZ to obtain the index of a character in encryption and decryption. The characters in the plain text and the cipher text have to be from 'ABCDEFGHIGKLMNOPQRSTUVWXYZ". In this lab, try to modify the code in the previous page to allow your python code to handle any characters in in the plain text and the cipher text Hint: use ASCII index(value) to represent a character. The python method which returns the ACSII index is ord().

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

See similar textbooks

Similar questions

PYTHON import pandas as pdfrom datetime import dateimport sys from sklearn.preprocessing import OrdinalEncoder def series_report( series, is_ordinal=False, is_continuous=False, is_categorical=False): print(f"{series.name}: {series.dtype}") ###### Your code here ###### # Check command line argumentsif len(sys.argv) < 2: print(f"Usage: python3 {sys.argv[0]} <input_file>") exit(1) # Read in the datadf = pd.read_csv( sys.argv[1], index_col="employee_id") # Convert strings to dates for dob and deathdf['dob'] = df['dob'].apply(lambda x: date.fromisoformat(x))df['death'] = df['death'].apply(lambda x: date.fromisoformat(x)) # Show the shape of the dataframe(row_count, col_count) = df.shapeprint(f"*** Basics ***")print(f"Rows: {row_count:,}")print(f"Columns: {col_count}") # Do a report for each columnprint(f"\n*** Columns ***")series_report(df.index, is_ordinal=True)series_report(df["gender"], is_categorical=True)series_report(df["height"], is_ordinal=True,…
Create a program using C# that implements the stream ciphers Cryptographic method . A stream cipher method inputs digits, bits, or characters and encrypts the stream of data. The onetime pad is an example of a stream cipher In this formative you have been requested to create an application that will work as the One-time pad (OTP), also called Vernam-cipher or the perfect cipher. This is a crypto algorithm where plaintext is combined with a random key and generate a ciphertext.
Create a program using C# that implements the stream ciphers Cryptographic method . A stream cipher method inputs digits, bits, or characters and encrypts the stream of data. The onetime pad is an example of a stream cipher.In this formative you have been requested to create an application that will work as the One-time pad (OTP), also called Vernam-cipher or the perfect cipher. This is a crypto algorithm where plaintext is combined with a random key and generate a ciphertext. The programme should received a string " How are you Isaac " The programme should generate an OTP of the length of the string entered "How are you Isaac "
write a python program that reads from an imbedded XML file and retrieves elements and attributes (Solution: myxml.py, myxml2.py)
Experiment 1: IMPLEMENTATION OF CAESAR CIPHER Objective: To implement the simple substitution technique named Caesar cipher using C+ language. Theory: To enerypt a message with a Caesar cipher, each letter in the message is changed using a simple rule: shift by three. Each letter of the message is shifted a fixed distance (3 for example) down the alphabet, A becomes D, B becomes E, and so on. For the last letters, we can think of alphabet as a circle and "wrap around", W becomes Z. X becomes A, Y becomes B, and Z becomes C. To change a message back, cach letter is replaced by the one three before it. Example ABCDEFGHIJKLMNOPQRSTUVWXYZ t t t t t t t t ttt t t t t t t tt t t t t t t ft DEFGHIJKLMNOPQRSTUVW XY Z ABc) digorithm STEP-1: Read the plain text from the user. STEP-2: Read the key value from the user. STEP-3: If the key is positive then encrypt the text by adding the key with each character in the plain text. STEP-4: Else subtract the key from the plain text. STEP-5: Display the…
In python: Implement the get_num_of_non_WS_characters() function. get_num_of_non_WS_characters() has a string parameter and returns the number of characters in the string, excluding all whitespace. Implement the get_num_of_words() function. get_num_of_words() has a string parameter and returns the number of words in the string
JAVA File read write and string manipulation data1.txt(down below) 4,5-t 2,4-d 20-p7int 2D 2nd 2 1080 &c 10-p7int 10th 11-p7int 12-p7int 16-p7int 18-p7int 1st 2,4,5-t 2,4-d 20-p7int 2D 2nd 30-30 3D 3-D 3M 3rd 48-p7int 4-D 4GL 4H 4th 5-p7int 5-T 5th 6-p7int 6th 7-p7int 7th 8-p7int 8th 9-p7int 9th @ @' @- @&M @&P @. @.@.@. @.B. @.B.@. @.C. @.D. @.D.C. @.F. @.F.@.M. @.G. @.H. @.I. @.I.@. @.I.D. @.L. @.L.P. @.M. @.M.@. @.M.D.G. @.N. @.p. @.r. @.R.C.S. @.U. @.U.C. @.V. @.w. @.W.O.L. @/C @/F j54rs54y54d J54rs54yit54 j54rs54yit54s J54rs54ym@n j54rs54ys j54rs54y's J54rs54yvill54 j54rt J54rubb@@l J54rubb@l J54rus@l54m J54rus@l54mit54 j54rvi@ j54rvin j54rvin@ j54rvin54 J54rvis J54rk J54S J54sh J54sh54r J54smin54 j54sp54r J54sp54rs54n J54ss J54ss@ J54ss@b54ll j54ss@k5454d J54ss@lin J54ss@lyn j54ss@my j54ss@mi54s J54ss@myn J54ss@min54 j54ss@nt J54ss54 J54ss54@n j54ss54d J54ss5454 J54ss54y J54ss54lyn J54ss54lt7n J54ss54n j54ss54s J54ssi J54ssy J54ssic@ J54ssi54 kikkl54 kikkl54d kikkl54s…
Buffer overlow :computer security In a C program, we print the address of relevant variables and arrays and get the following: 0xbfffe7b8 i 0xbfffe7bc length 0xbfffe7c0 hash_ptr 0xbfffe7ce targetuid 0xbfffe7d5 userid 0xbfffe817 pw 0xbfffe858 t 0xbfffe899 hashhex 0xbfffe8da target 0xbfffe91b hash 0xbfffe95c buffer The program executes the following instruction: strcpy(pw, buffer); You want to exploit the buffer overflow vulnerability by putting in buffer a string aaaaaaaaaaaaa ... 0c0beacef8877bbf2416eb00f2b5dc96354e26dd1df5517320459b1236860f8c with the goal of putting the hash 0c0beacef8877bbf2416eb00f2b5dc96354e26dd1df5517320459b1236860f8c variable target. If you count offset as 0 for the first a, 1 for the second a, and so on, what should be the offset of 0, the first character of the hash? In other words, how many a's should you put before the first zero character? (You can give the answer in decimal or in hexadecimal, but please specify.)
>>> seqs = readFastaFile('mystery1.fa') >>> len(seqs) 27 >>> long_seqs = [] >>> for seq in seqs: ... print(seq.name, len(seq), len(seq.alphabet)) ... if len(seq) > 250: ... long_seqs.append(seq) Q9H9L7 192 20 P41223 144 20 Q13352 177 20 ... >>> writeFastaFile('mystery1_long.fa', long_seqs) List the 'special' methods from the sequence class in the first field. Just enter the method name for each, for example, for `__len__(self)` you would enter `__len__`. In the second, provide an example of each function's use using text, not code.
IN JAVA SCRIPT Create a function that takes an integer n and reverses it. Examples rev (5121) ➡ "1215" rev (69) ➡ "96" rev (-122157) "751221" (Ctrl)
In this exercise you will design and implement a simple encryption program that can either encrypt or decrypt a string of text by following the steps below. Create a dictionary dict that maps each (lower case) character of the basic Latin alphabet to another. Make sure no one letter is mapped to itself. Do not use a simple ordering, such as reversing the alphabet. This will act as your cipher. Your program should be able to ask user for a text and encrypt it. Your program will take each character in the string and swap it with the corresponding character from the cipher, print the encrypted text. Your program should be able to decrypt encrypted text as well. It should perform the opposite operation as the encrypt does. Print the decrypted text. Create a loop that asks if the user would like to encrypt some text, decrypt some cipher text, or exit the program. Perform the operation the user selects, printing the computed text if applicable.
implementation of Caesar Cipher Using Python Write Code: You are required to implement the Caesar Cipher encryption/decryption algorithm in Python. Remember to implement the algorithm in such a way that it takes a file as input, encrypts it and store in the current directory. This encrypted file must checkable. The implementation must have a decryption procedure which takes the encrypted file from the current directory, decrypts it and store it with some specific name in the current directory. The name should be different from the original file so that it can be verified.