26 is 3. Therefore‚ the decryption function is x = 3(y − 2) = 3y − 2 (mod 26). Now simply decrypt letter by letter as follows. U = 20 so decrypt U by calculating 3 ∗ 20 − 6 (mod 26) = 2‚ and so on. The decrypted message is ’cat’. 3. Changing the plaintext to numbers yields 7‚ 14‚ 22‚ 0‚ 17‚ 4‚ 24‚ 14‚ 20. Applying 5x + 7 to each yields 5 · 7 + 7 = 42 ≡ 16 (mod 26)‚ 5 · 14 + 7 = 77 ≡ 25‚ etc. Changing back to letters yields QZNHOBXZD as the ciphertext. 4. Let mx + n be the encryption function. Since
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STUDY OF SMS SECURITY AS PART OF AN ELECTRONIC VOTING SYSTEM A thesis Submitted to the Department of Computer Science & Engineering Of BRAC University By Chowdhury Mushfiqur Rahman ID: 02101108 Shah Md. Adnan Khan ID: 01201055 In Partial Fulfillment of the requirements for the Degree Of Bachelor of Computer Science & Engineering May 2006 BRAC University‚ Dhaka‚ Bangladesh DECLARATION I‚ Chowdhury Mushfiqur Rahman‚ University ID: - 02101108 have completed some modules of our proposed Thesis
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There are two basic types of encryption; asymmetrical and symmetrical. Asymmetrical uses two keys; a public and a private key. The public and the private keys have unique characteristics. In asymmetric encryption you can encrypt with a public key that has a matching private key used for decryption. The other basic type of encryption is called symmetric encryption; the main difference between the two is that symmetrical encryption uses only one key; a private key used for both encryption and decryption
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User Course Theories Of Security Management Test Week 11 Final Exam Started 12/16/14 7:58 AM Submitted 12/16/14 8:25 AM Status Completed Attempt Score 100 out of 100 points Time Elapsed 26 minutes out of 2 hours. Instructions This final exam consists of 50 multiple choice questions and covers the material in Chapters 5 through 10. Question 1 2 out of 2 points Two parties‚ Party A and Party B‚ regularly exchange messages using public key cryptography. One party‚ Party A‚ believes that its private
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is evenly divisible by (P-1)(Q-1) * 4. Encryption function is C = (T^E) mod PQ * C is the ciphertext (positive integer) * T is the plaintext (positive integer) * T must be less then the modulus PQ * 5. Decryption function is T = (C^D) mod PQ * C is the ciphertext (positive integer) * T is the plaintext (positive integer) * D is the private key RSA Encryption * Relying on * No one can solve * Would take to long to solve
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Part A ( 1 ) The Vigenère cipher is a method of encrypting alphabetic text by using a key known as a running key‚ which is generated by a keyword. In a Caesar cipher‚ we have to shift every letter of the alphabet with other number of places The Vigenère cipher consists of many Caesar ciphers in sequence with different shift values. The Caesar cipher with digraph coding provides a means of increasing the key space from 26 to 676 ‚ so the key can take any value between 0 and 675 . ( 2 ) This digraph
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Columnar Transposition Introduction The Columnar Transposition cipher is very simple and easy to implement cipher. It is a transposition cipher that follows a simple rule for mixing up the characters in the plaintext to form the cipher text. How it works In a columnar transposition‚ the message is written out in rows of a fixed length‚ and then read out again column by column‚ and the columns are chosen in some scrambled order. Both the length of the rows and the permutation of the columns are
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Computer forensics is the branch of forensic science dedicated to evince the dissembled secrets in computers confiscated from criminals. Usually hackers are described as nefarious criminals‚ but the people dedicated to computer forensics are usually good hackers that work for the police. Therefore‚ the term hacker is decried but as is shown there are many that work for the good. The goal in this job is to exhume and preserve the murky secrets that are hidden in diverse parts of the different seized
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A Term Paper On RSA Subject: Information System and Cyber Laws Bachelor of Technology In Computer Science & Engineering Session: 2012-13 Submitted to: Submitted by: Ms. Shruti Saxena Arpit Varshney Roll No.1012210026 Group: 61 SHRI RAMSWAROOP MEMORIAL Group OF PROFESSIONAL COLLEGES‚ LUCKNOW Affiliated to G.B. TECHNICAL UNIVERSITY‚ LUCKNOW INTRODUCTION * RSA is an algorithm for public-key cryptography that
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man-in-the-middle attackers to insert data into HTTPS sessions‚ and possibly other types of sessions protected by TLS or SSL‚ by sending an unauthenticated request that is processed retroactively by a server in a post-renegotiation context‚ related to a "plaintext injection" attack‚ aka the "Project Mogul" issue. 8. It’s a tool for practitioners because they can see what vulnerability they need to correct and patch‚and it’s a hacker’s tool because it lists the vulnerability they can exploit. 9. They can
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