You are given a plaintext and a ciphertext, and you know that aes-128-cbc is used to generate the ciphertext from the plaintext, and you also know that the numbers in the IV are all zeros (not the...

You are given a plaintext and a ciphertext, and you know that aes-128-cbc is used to generate the ciphertext from the plaintext, and you also know that the numbers in the IV are all zeros (not the ASCII character ‘0’). Another clue that you have learned is that the key used to encrypt this plaintext is an English word shorter than 16 characters; the word that can be found from a typical English dictionary. Since the word has less than 16 characters (i.e. 128 bits), space characters (hexadecimal value 0x20) are appended to the end of the word to form a key of 128 bits. Your goal is to write a program to find out this key. English word list is also provided along with the program structure in the Project-1.zip file. The plaintext and ciphertext is the following


41900 – Fundamentals of Security Project Part-2 (Week 9 – Week 12) Finding secret key used in encryption, where plaintext, ciphertext and IV are given OpenSSL provides an API called EVP, which is a high-level interface to cryptographic functions. Although OpenSSL also has direct interfaces for each individual encryption algorithm, the EVP library provides a common interface for various encryption algorithms. To ask EVP to use a specific algorithm, we simply need to pass our choice to the EVP interface. A sample code is given in http://www.openssl.org/docs/crypto/EVP_EncryptInit.html. Please get yourself familiar with this program, and then complete this project. You are given a plaintext and a ciphertext, and you know that aes-128-cbc is used to generate the ciphertext from the plaintext, and you also know that the numbers in the IV are all zeros (not the ASCII character ‘0’). Another clue that you have learned is that the key used to encrypt this plaintext is an English word shorter than 16 characters; the word that can be found from a typical English dictionary. Since the word has less than 16 characters (i.e. 128 bits), space characters (hexadecimal value 0x20) are appended to the end of the word to form a key of 128 bits. Your goal is to write a program to find out this key. English word list is also provided along with the program structure in the Project-1.zip file. The plaintext and ciphertext is the following: Plaintext (total 21 characters): “This is a top secret” Ciphertext (in hex format): “2075386b75eed8b4f2b4a9c9b76967d057b4a441d349c15dd4b8bf4b87445a9e” Expected Result: If the C program has been completed correctly, you should be able to locate the word used as the key to encrypt the plain text. The program must: 1. Scan through the entire words.txt file until a match is found. 2. Use each word to encrypt the plaintext. 3. Compare the encrypted text with the ciphertext bit by bit. 4. Find a match, based on which find the word used. 5. Display the found word, its ciphertext next to the ciphertext being searched for. 6. The length of the ciphertext. Submission Deadline: 14th October - 10am (Any Submissions received after the deadline will be subjected to penalties) http://www.openssl.org/docs/crypto/EVP_EncryptInit.html http://www.openssl.org/docs/crypto/EVP_EncryptInit.html 41900 – Fundamentals of Security Project Part-2 (Week 9 – Week 12) Important Notes: Note 1: Download the Project-Part-2.zip file directly to the SecFun VM image to avoid any potential format changes in the document. Note 2: If you choose to store the contents of words.txt in a separate file and feed the file to your program, you need to check whether any additional formatting is required. Some editors may add a special character to the end of the file. If that happens, you can use a hex editor tool to remove them. Note 3: In this project, you are required to complete the given program and invoke the crypto library. No credit will be given if you simply use the OpenSSL commands to do this project. Note 4: To compile your code, follow the comments provided in the Skeleton code. You are required to edit/complete the areas with comments marked within ‘ /* ’ and ‘ */ ’. Note 5: Information regarding the program file will be discussed during the tutorial session by your respective Tutors. Any questions regarding the assignment can be discussed during the tutorial session or emailed to the tutor (with the Subject Coordinator CC’d). Instructions for compiling and running the program: To Compile use: ➢ gcc -o enc encrypt.c -std=c99 -lcrypto -ldl To run the compile code use: ➢ ./enc Marking Criteria (Total Weightage 20%): Criteria Incomplete Work Partial Work Full Work Program Completeness 0 Points 3 Points 5 Points Program Submitted without any changes Program Modified, but missing certain components Program contains all essential components. Program Functioning 0 Points 3 Points 5 Points Program does not compile / run Program calculates ciphertext but can’t find a match Program calculates ciphertext and finds a match Demo and Questionnaire 0 Points 5 Points 10 Points Unable to answer questions. Able to partially answer the questions. 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