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Part 2: Encryption Objective: Develop a program that encrypts a plaintext file by XORing 128-bit blocks of the file with a key repeatedly until the entire file is encrypted. Details: • The plaintext file will be a book from Project Gutenberg. • The encryption method should use the XOR operation on the file, 128 bits at a time, with the key. • Each 128-bit block is XORed with the same key. • The program should work from the command line and accept three parameters: o The name of the key file o The name of the plaintext file o The desired name of the resulting ciphertext file Note: This encryption method is not supposed to be secure.

Part 2: Encryption Objective: Develop a program that encrypts a plaintext file by XORing 128-bit blocks of the file with a key repeatedly until the entire file is encrypted. Details: • The plaintext file will be a book from Project Gutenberg. • The encryption method should use the XOR operation on the file, 128 bits at a time, with the key. • Each 128-bit block is XORed with the same key. • The program should work from the command line and accept three parameters: o The name of the key file o The name of the plaintext file o The desired name of the resulting ciphertext file Note: This encryption method is not supposed to be secure.

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Part 2: Encryption Objective: Develop a program that encrypts a plaintext file by XORing 128-bit blocks of the file with a key repeatedly until the entire file is encrypted. Details: • The plaintext file will be a book from Project Gutenberg. • The encryption method should use the XOR operation on the file, 128 bits at a time, with the key. • Each 128-bit block is XORed with the same key. • The program should work from the command line and accept three parameters: o The name of the key file o The name of the plaintext file o The desired name of the resulting ciphertext file Note: This encryption method is not supposed to be secure. Usage: $ ./bad_streamcipher_enc kf pt ct
Transcribed Image Text:Part 2: Encryption Objective: Develop a program that encrypts a plaintext file by XORing 128-bit blocks of the file with a key repeatedly until the entire file is encrypted. Details: • The plaintext file will be a book from Project Gutenberg. • The encryption method should use the XOR operation on the file, 128 bits at a time, with the key. • Each 128-bit block is XORed with the same key. • The program should work from the command line and accept three parameters: o The name of the key file o The name of the plaintext file o The desired name of the resulting ciphertext file Note: This encryption method is not supposed to be secure. Usage: $ ./bad_streamcipher_enc kf pt ct
9:46 $ ./bad_streamcipher_dec kf ct pt2 description Part 4: Cryptanalysis Details: Done Objective: Outline a method for breaking the encryption scheme implemented in Part 2 and, optionally, develop a solution to demonstrate breaking the encryption under certain assumptions. ( • Provide a method to break the scheme under known plaintext attack (KPA) assumptions. • Bonus: Code a solution to break an arbitrary ciphertext under KPA assumptions and demonstrate that it works. 1 • Bonus: Code a solution that breaks the encryption under ciphertext-only assumptions and demonstrate that it works. • Compile a report written in Markdown with proper formatting of code and text to present your solution and findings. Submission Guidelines Ensure to test your programs thoroughly to confirm
Transcribed Image Text:9:46 $ ./bad_streamcipher_dec kf ct pt2 description Part 4: Cryptanalysis Details: Done Objective: Outline a method for breaking the encryption scheme implemented in Part 2 and, optionally, develop a solution to demonstrate breaking the encryption under certain assumptions. ( • Provide a method to break the scheme under known plaintext attack (KPA) assumptions. • Bonus: Code a solution to break an arbitrary ciphertext under KPA assumptions and demonstrate that it works. 1 • Bonus: Code a solution that breaks the encryption under ciphertext-only assumptions and demonstrate that it works. • Compile a report written in Markdown with proper formatting of code and text to present your solution and findings. Submission Guidelines Ensure to test your programs thoroughly to confirm
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