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Delving into Cryptography Exploring the Basics of Cryptography

Cryptography is the art of securing information through encryption, rendering it unreadable except to authorized individuals. In today's digital landscape, cryptography plays a crucial role in safeguarding sensitive data across various sectors.

The Power of Encryption Algorithms

Encryption algorithms, such as the renowned RSA algorithm, employ sophisticated mathematical principles to protect data integrity and confidentiality. These algorithms ensure secure communication channels and authentication mechanisms vital for online transactions and data privacy.

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Recently Asked Cryptography Questions

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Q1:ASSIGNMENT INSTRUCTIONS Task01: Determining the hash type Hash Lookup Analyzer: https://www.tunnelsup.com/hash-analyzer/ Links to an external site. Normally we can have a good guess the type of hash is based on the fixed length of the hash. For this activity though, let's use the online tool provided in the activity to try to determine the hash type of the below three hashes and determine the cleartext password of the hashed text. Sometimes these tools may not always know the hash, they can be a good starting point to try to quickly identify a hash type. (Note the hashes below are all the same password) 5366a90275a8fc64acbaab5d697e6d94 a9f44ff05b323527ca3a496c791faf050a1239c6 462b0be44f0b7738bc83ac62ad132911e97a5cb6f60ffe6fc161f2f5acbb2ce7 What is the cleartext password(s) of the hashes? Deliverable: Identify the given hash types for each entry as well as providing the cleartext of the password. explain by step please itSee Answer
Q2:Question Q) Explain why RSA Algorithm? Why does the algorithm work .Explanation of encryption and de- cryptation formula the relationship of formulas With examples of the logarithm And create an diagram with the public key and the element that are known to us and the one that are known for the other per- sonSee Answer
Q3:/n Concept and Benefits of Green Business Rxxx AlDxxx XXXXX Gulf University for Science and Technology ENGL 201 - 84 Dr Deniz Erguvan 1 Table of contents Executive Summary.. Introduction... Background... Analysis...... Question 1... Question 2.... Question 3... Conclusions and Recommendations..... References... .6 ...6 ..10 .12 .13 2 Executive Summary The aim of this report is to discuss the concept and benefits of green business. The environment has suffered from the carbon footprint of businesses through the years. This topic was investigated by using multiple secondary data. The results indicate that in order to protect the environment, more businesses need to go green because green businesses have decreased the greenhouse gas emissions. In addition, going green has its challenges, such as the lack of knowledge and skills. Moreover, this report discusses some successful green businesses and their sustainable practices. No green business owner has been consulted in the preparation of this report. This could lead to the limitation of information and updated statistics. 3 Introduction The present report investigates the concept and benefits of Green Business. The main aim of the report is to show that Green Businesses are vital to preserve the environment. In particular, the report attempts to answer the following three questions: • How effective are Green Businesses to the environment? • What are sustainable challenges that Green Businesses might face? • What are some successful examples of Green Businesses? The report is organized as follows. First, the background section discusses what is a Green Business and why it is important. Then, the analysis section presents the data from three sources regarding several aspects of the topic at hand such as challenges that may occur while implementing sustainable measures and what positive outcomes that resulted after going green. The report ends with conclusions from the analysis and gives recommendations on how to address the issue. Background The purpose of this report is to analyze the concept and benefits of Green Business and examine the impacts it has on both the business, and the environment. Green Business also known as sustainable business, is a business that follows specific ways and strategies to minimize the negative outcomes and impacts on the environment (IBM institute, 2021). Green businesses aim to reduce environmental problems such as reducing emissions (which causes global warming) and resource depletion. The term "sustainable” first appeared in 1713 by Hans carl von Carlowitz, Jacobus (2007). However, businesses did not care about their footprint until late nineteenth century, Bergquist (2017). Later, people started to have more awareness regarding the dangers of damaging the environment. Sustainability's recent development has been noticeable all around the world. Big number of businesses started directing towards the sustainable or green route. They shifted routes after the occurrence of many 4 unfortunate business accidents that caused harm to the environment. Oil spillages and gas leaks are some examples of the countless accidents that happened. In addition, many natural disasters occurred at the same time, such as wildfires, hurricanes, and drought, Carollo (2005). Sustainability has become an important part of any business around the globe currently. Even though sustainable strategies might not be the main focus, many if not all businesses have included some of them in their business, Carollo (2005). 5 The concept and benefits of green/sustainable businesses is one of the most important topics to discuss in this time and age, because it directly affects our planet's well-being. Unlike green businesses, unsustainable businesses are known to cause enormous environmental issues. According to Impactday (2023), "They include resource depletion, pollution of air, water, and soil, habitat destruction, greenhouse gas emissions, waste generation, and the loss of biodiversity”. Therefore, the environment is in dire need for help. If businesses keep on increasing their carbon footprint, the consequences will be threatening and dangerous, not only for the planet, but for all beings habituating it. Therefore, addressing and raising awareness regarding this serious issue is mandatory. This report's findings will interest most people, since it discusses an environmental topic that affects everyone. According to case (2023), people with higher educational degrees and higher salaries are more likely to be interested in sustainability. In addition, business owners who aim to protect the environment while carrying on with their business will be interested in this report. New business owners would benefit from this report to help them understand what a sustainable business is and what challenges it might face./n FULL TITLE of the REPORT Your Name, GUST ID Presented to Dr. Xxx Xxx ENGL 201 Business Writing Section X Date of Submission: Table of Contents Executive Summary.. Introduction... Background...... Analysis..... Question 1 Question 2.. Question 3.... Conclusions and Recommendations.. References.. Appendix..... The Appendix shows the questions you asked your respondents to gather data for your research if you used a questionnaire, survey, and/or interview. 2 .3. .4 X X .X ..✗ ..✗ .X Executive Summary "An Executive Summary presents a brief statement of the problem studied, a statement of how it was studied, and a summary of the results, conclusions, and recommendations. Executive summaries are prepared as stand-alone documents that is, they do not relate to specific pages of the report. The summary can be read and understood as a separate document by people who do not have access to the complete report." 3 Introduction The present report investigates The main aim of the report is to show that particular, the report attempts to answer the following three questions: • Question one: Question two: • Question three: In The report is organized as follows. First, the background section discusses Then, the analysis section presents the data from three/four/five sources regarding several aspects of the topic at hand such as and _. The report ends with conclusions from the analysis and gives recommendations on how to address the issue. Background In the background section of the paper, you must define your terms of reference (Statement of the background, objectives, and purpose of your report), as well as provide a broader context for the topic of your report. What is the historical context? What are the recent developments? Why is the topic important? What segment of the society is affected by the topic? Who might be interested in the findings? Include as many important facts, expert opinions, and interpretations as you can. This part of the report sets the stage for your analysis. Write a minimum of one page. Analysis This is the most important part of the report. All of your data will be presented here. All questions should have a chart/graph/table/or figure. With each chart/graph/table/or figure, you must number it and give it a title. For example, Figure 1. Unemployment in the GCC in 2013. You must also indicate from where you got the data. Each question in the Analysis will have at least three (3) paragraphs. For each question: First: Write the question as shown in the example. Next: Below the question, begin with Paragraph 1, refer to the example. Paragraph 1: An introduction to the question, in sentence format, (take your question and change it into a sentence) and write a background statement(s) of its importance--what you are looking at/hoping to find. Paragraph 2: Introduce your chart/graph/table/figure. Then, show your chart/graph/table/figure. Your chart/graph/table/figure will show the data used to answer your question, and it will show the answer(s) to your question. Reminder: With each chart/graph/table/figure, you must number it and give it a title. For example, Figure 1. Unemployment in the GCC in 2013. You must also indicate from where you got the data. For example: www.xxx.xxx or referencing an interview, questionnaire, or survey you conducted. Paragraph 3: Write a detailed explanation of what your chart/graph/table/figure shows and relate the evidence to your question and the point that you are trying to make. If you need two (2) charts to help answer your question, follow the above and add the following: Paragraph 4: Introduce your chart/graph/table/figure. Then, show your chart/graph/table/figure. Your chart/graph/table/figure will show the data used to answer your question, and it will show the answer(s) to your question. Paragraph 5: Write a detailed explanation of what your Chart/Graph/Table/Figure shows and relate the evidence to your question and the point that you are trying to make. Cite in APA format. Here is one place to help you: https://owl.purdue.edu/owl/research_and_citation/apa_style/apa_formatting_and_style_guide/ge neral_format.html 5See Answer
Q4: TO DO- Need to do 1,2,4 Code with comments + output screenshots+ report (Put the screenshots in a Word file and under the image screenshot there should be a short description of what the image signifies)/nSee Answer
Q5:3. Suppose that I propose a new version of DES called Quadruple DES, which uses 4 56-bit keys instead of the 3 used by Triple DES. The structure is similar to that of Triple DES, with an additional encryption with the fourth key: Plaintext DES DES DES DES Ciphertext Key 1 Key 2 Key 3 Key 4 Since this uses four keys, I argue that this is more secure than Triple DES, which uses 3 keys. Explain why it is not more secure than Triple DES; specifically • Why adding a fourth key does not create any additional security over having just three keys, and • Where in the above structure you would perform an attack. Big hint: Why is triple DES used? That is, why is double DES not used? If you don't know this, be sure to view the lecture on triple DES again!See Answer
Q6:2. Use the following permutation box to encrypt the last two digits of your Banner ID (adding 2 to each digit first): 3 6 1 Specifically: 2 8 | 5 4 a) Add 2 to each of your last 2 digits and then compute the 4 bit binary numbers for those values. For example, if the last two digits were 94, this would be 11 and 6, which would be 1011 0110 in binary. b) Run the resulting 8 bit binary number through the above permutation box.See Answer
Q7:1. Suppose that you have intercepted the following ciphertext message from me, which you know to have been encrypted with a monoalphabetic substitution cipher: hbypdubidpdufknbaopebxpbbxpdswxrgxsbxpacfiwdx You are to perform a frequency analysis to retrieve the plaintext that I generated the ciphertext from. Specifically: a) Create a frequency table from the ciphertext. b) Based on this, what would be the most likely ciphertext character that the plaintext character e maps to? c) The letter e is very often followed by the letter n, which itself is a very common character. Based on this, what ciphertext character is it most likely that n maps to?See Answer
Q8: CYSE476/ECE476 CRYPTOGRAPHY FUNDAMENTALS Project la: Analyze Historical Ciphers Reading Assignment: ● C. Paar and J. Pelzl, Understanding Cryptography, Chapter 1 • W. Stallings, Cryptography and Network Security 8th edition, Chapter 3 SPRING 2024 ● A. Menezes, P. van Oorschot, and S. Vanstone, Handbook of Applied Cryptography, Chapter 7.3 • CrypTool - Online Help Help → Starting page → Functionality of CrypTool → Document encryption → Sym- metric (classic) Help → Starting page → Functionality of CrypTool → Analyzing Documents → Tools for Analysis and Symmetric Encryption (classic) 1 Installation In order to complete this lab you might want to install CrypTool on your personal computer/laptop. You can download CrypTool from https://www.cryptool.org. The recommended version of software is CrypTool 1 (CT1) ver. 1.4.42 - English. 2 Frequency Analysis Task 1 (10 points) Prepare three relatively long English texts (each of the size of 10,000 or more letters) taken from: • novel, • newspaper, • reference manual. Find on the Internet a similar single text (≥ 10,000 letters) written in an arbitrary foreign language. • Determine and provide a histogram showing in the graphical form the relative frequency of letters in all four prepared long texts, as well, as the textual listings 26 most frequent diagrams and trigrams. • Do the frequency distributions depend significantly on the type of text in English? • Do these distributions depend significantly on the language in which the message was written? 1 CYSE476/ECE476 CRYPTOGRAPHY FUNDAMENTALS SPRING 2024 Task 2 (10 points) Take a small subset of all four texts prepared in Task 1, e.g., their first 200 letters, and recompute all frequency distributions. • Determine how good is the match between frequency distributions for short texts and long texts of the same type, written in the same language. • Summarize your observations. Task 3 (25 points) Encrypt a single long and a single short English text taken from a novel, prepared in Tasks 1 and 2, using the following 6 classical ciphers available in CrypTool: Caesar, Vigenere, Hill, Substitution, Playfair, and Permutation. Compute the frequency distribution of single letters, diagrams, and trigrams for all 12 obtained ciphertexts. . What are the characteristic features of the obtained distributions? • How you could use them to determine which cipher was used to obtain the given ciphertext? 2See Answer
Q9:2. If the key length of a block cipher is 64 bits, what is the size of the key space? (5 points) Hint: The key space consists of all possible keys. A. 64 B. 264 C. 232 D. 2128See Answer
Q10:4.18 Consider the following protocol: A KDC: IDA IDB|N₁ KDCA: A →B: B-A: E(K. [Ks|| IDB|| N₁ E(K₁. [KsIDA))) E(Kb. [KsIDA]) E(KS, N₂) A→B: E(Ks. f(N₂)) a. Explain the protocol. b. Can you think of a possible attack on this protocol? Explain how it can be done. c. Mention a possible technique to get around the attack-not a detailed mechanism, just the basics of the idea. Note: The remaining problems deal with a cryptographic product developed by IBM, which is briefly described in a document at this book's Web site in IBMCrypto.pdf. Try these problems after reviewing the document.See Answer
Q11:Q3. Suppose EK is a block cipher with a block size of 128 bits and a key size of 80 bits. (i) Explain how to use Ek to encrypt a message of length 400 bits using CTR mode. You may use a diagram to illustrate your answer. (6 marks) (ii) In contrast to CTR mode, using CBC mode requires padding. State FOUR proper- ties that a padding scheme must satisfy. (4 marks) (iii) Explain how to use Ek to encrypt a message of length 200 bits using CBC mode. You may assume a suitable padding scheme. You may use a diagram to illustrate your answer. (6 marks) (iv) Give THREE examples of application contexts where CTR mode may be preferred to CBC mode, justifying your answer in each case. (9 marks)See Answer
Q12:The plaintext APPEAL was encrypted by a Hill cipher using a 2x2 matrix. The resulting encryption is NUQHNG. Enter the matrix that was used to encrypt the text.See Answer
Q13:Two pieces of ciphertexts are given below. The first one is encrypted using Vigenere cipher, whereas the second one is encrypted using Caesar cipher. Using CrypTool software, perform a ciphertext only attack on both pieces of ciphertext. a) Explain the cryptanalytic method you used to break the code and mention the results of the cryptanalysis you made to guess the key b) Find the encryption key c) Find the corresponding plaintext Vigenere Cipher dithcmkl xitulrzfxw klamtnwpp vyzfygi dbci kulr r clvkvnycnc ectzvzgsq fe avfgzgfy.elvl lpjb cihhtvv gsek clvkvnmgnyxj op me czwjrdwzby sw fzqv fpgire meszvdnemfa, hlzps vrvdij dfijgtsef Iffhe xyr nvvnemfa, omjgcmshemfa, Iru ccskrnxzby sw gsek fpgire meszvdnemfa. elvep ecfz qrl mi r eppznygv by gfzxyevnekvzrj ccskbnscf hlffp fvulzzbc qrl nsdcwmtnei kup xrfv sw qpzvyztzar xyr dithcmkl xitulrzfx. jfe pbrzapv, vq xyr avfcpv whygkvzrzar sw gsi jrnyivec drnlratwd epulvcij fpxkvyk kvxi cvxmkf zr kup xinywzg emdr zj r zpwjnri wezq jryhve es irnizipv, kupr raj tibestbw si apxnbco kulx zaevfqfgvf geivlfcr, frgephzpeesyp hvylcj zlc iryhve dytu emdr wmdvew drlrzarpvfd. Caesar Cipher qeb jlob zofqfzxi x zljmlkbkq lo pbosfzb, qeb efdebo fp qeb ibsbi lc xsxfixyfifqv obnrfoba. zlkpfabo x pvpqbj qexq molsfabp xrqebkqfzxqflk pbosfzbp clo zofqfzxi pvpqbjp, xmmifzxqflkp, xka absfzbp. xk fkqboormqflk lc pbosfzb obpriqp fk qeb fkxyfifqv clo zrpqljbop ql xzzbpp zljmrqfkd obplrozbp xka pqxcc ql xzzbpp qeb obplrozbp qebv kbba ql mbocloj zofqfzxi qxphp. qeb ilpp lc qeb pbosfzb qoxkpixqbp fkql x ixodb cfkxkzfxi ilpp fk ilpq bjmilvbb molarzqfsfqv xka mlqbkqfxi zrpq|jbo ilpp.See Answer
Q14:6. For the binary version of One-Time Pad, if the ciphertext is 10110010 and the key is 01011010, what is the corresponding plaintext? (5 points) () A. 11111010. B. 00010010. C. 11101000. D. 10101001.See Answer
Q15:3. We assume Z26 = {0, 1, 25} is the alphabet for One-Time Pad, and the Plaintext space= Ciphertext space = Key space= (Z26)³. If the ciphertext is (11, 24, 5, 19, 22) and the key is (2, 20, 2. 10, 23), what is the decrypted plaintext? (5 points) () A. (13, 18, 7, 3, 19). B. (9, 4, 7, 29, 25). C. (13, 18, 3, 29, 25) D. (9, 4, 3, 9, 25).See Answer
Q16:2. We assume Z26 = {0, 1, 25} is the alphabet for One-Time Pad, and the Plaintext space= Ciphertext space = Key space= (Z26)³. If the plaintext is (11, 8, 5, 19, 22) and the key is (2, 20, 15, 10, 6), what is the ciphertext? (5 points) ( ) A. (13, 2, 20, 3, 2). B. (13, 28, 20, 29, 28). C. (13, 28, 20, 29, 2) D. (13, 24, 6, 23, 24).See Answer
Q17:1. Which description about Information Theoretic Security is NOT correct? (5 points) ( ) A. Ciphertext should reveal no "information about Plaintext (except for its length). B. One-Time Pad can achieve Information Theoretic Security. C. If the cipher can achieve Information Theoretic Security, the probability distribution of the plaintext would change after knowing the ciphertext. D. To achieve Information Theoretic Security, the key should be completely random and at least as long as the plaintext/ciphertext.See Answer
Q18:IV 2.16 Padding may not always be appropriate. For example, one might wish to store the encrypted data in the same memory buffer that originally contained the plaintext. In that case, the ciphertext must be the same length as the original plaintext. A mode for that purpose is the ciphertext stealing (CTS) mode. Figure 2.12a shows an implemen- tation of this mode. P₁ K→Encrypt K C₁ P₁ IV (bb bits) Encrypt C₁ (bb bits) ... CN-3 CN-3- ... K K- PN-2 Encrypt PN-2 (bb bits) (+) CN-2 (a) Ciphertext stealing mode Encrypt CN-2 (bb bits) KEncrypt PN-1 (bb bits) KEncrypt PN-1. CN-1 (bb bits) CN X K KEncrypt (b) Alternative method Figure 2.12 Block Cipher Modes for Plaintext not a Multiple of Block Size PN 00...0 Encrypt CN-1 Select leftmost j bits PN (j bits) CN (j bits)See Answer
Q19:21/1 2.11 Alice and Bob agree to communicate privately via e-mail using a scheme based on RC4, but they want to avoid using a new secret key for each transmission. Alice and Bob privately agree on a 128-bit key k. To encrypt a message m consisting of a string of bits, the following procedure is used. 1. Choose a random 80-bit value v 2. Generate the ciphertext c= RC4(v || k) + m 3. Send the bit string (v || c) a. Suppose Alice uses this procedure to send a message m to Bob. Describe how Bob can recover the message m from (v|c) using k. b. If an adversary observes several values (v₁|c₁), (v₂|| c₂),... transmitted be- tween Alice and Bob, how can he or she determine when the same key stream has been used to encrypt two messages?See Answer
Q20:2.8 Another approach to deskewing is to consider the bit stream as a sequence of non- overlapping groups of n bits each and output the parity of each group. That is, if a group contains an odd number of ones, the output is 1; otherwise the output is 0. a. Express this operation in terms of a basic Boolean function. b. Assume, as in the Problem 2.7, that the probability of a 1 is 0.5 + 8. If each group consists of 2 bits, what is the probability of an output of 1? c. If each group consists of 4 bits, what is the probability of an output of 1? d. Generalize the result to find the probability of an output of 1 for input groups of n bits.See Answer

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