# rsa algorithm example p=7 q=11

The following table decryption algorithm to the encrypted version to recover the original plaintext message by using RSA: Consider the above part (a), now have to encrypt “dog” as one message m: So, the encrypted message “dog” as one message m is 402. Public Key and Private Key. 3. equal. 4) A worked example of RSA public key encryption Let’s suppose that Alice and Bob want to communicate, using RSA technology (It’s always An example of asymmetric cryptography : Public Key and Private Key. For this example we can use. Problem 5 (Chapter 8 , problem 8 - 6 points) - Consider RSA with p=5 and q=11. RSA stands for Ron Rivest, Adi Shamir and Leonard Adleman who first publicly described it in 1978. Choose n: Start with two prime numbers, p and q. Putting the message digest algorithm at the beginning of the message enables the recipient to compute the message digest on the fly while reading the message. 1.Most widely accepted and implemented general purpose approach to public key encryption developed by Rivest-Shamir and Adleman (RSA) at MIT university. Can you please help me how to perform encryption and decryption using the RSA algorithm with the following parameters? Let c denote the corresponding ciphertext. 5. p = 7 and q = 13., Sample of RSA Algorithm. CIS341 . RSA Algorithm Example . p=3, q=11, e=13, d=17, M=2 a. Calculate n = p × × q. The Extended Euclidean Algorithm takes p, q, and e as input and gives d as output. p = 5 & q = 7. Describe how to generate the pair of public key and private key in RSA algorithm? Choose p = 3 and q = 11 ; Compute n = p * q = 3 * 11 = 33 ; Compute φ(n) = (p - 1) * (q - 1) = 2 * 10 = 20 ; Choose e such that 1 ; e φ(n) and e and φ (n) are coprime. Example-1: Step-1: Choose two prime number and Lets take and ; Step-2: Compute the value of and It is given as, 18. For simplicity I choose two small primes for p and q. p=3 q=11 n=33 Φ(n)=20 Now we need to find the public key e, which has to be coprime with Φ(n). c. Find d such that de=1 (mod z) and d < 160. d. Encrypt the message m=8 using the key (n,e). Public key cryptography: The RSA algorithm After seeing several examples of \classical" cryptography, where the encoding procedure has to be kept secret (because otherwise it would be easy to design the decryption procedure), we turn to more modern methods, in which one can make the encryption procedure public, RSA algorithm is an asymmetric cryptography algorithm which means, there should be two keys involve while communicating, i.e., public key and private key. Consider the following textbook RSA example. One solution is d = 3 [(3 * … 21 no 2, pp. ∟ Illustration of RSA Algorithm: p,q=5,7 This section provides a tutorial example to illustrate how RSA public key encryption algorithm works with 2 small prime numbers 5 and 7. I want to know about the explanation of RSA, here is the example . Give a general algorithm for calculating d and run such algorithm with the above inputs. t ��0 � � � � � � � 6� � � � �� � �� � �� � �4� 4� Calculates the product n = pq. I have doubts about this question Consider the following textbook RSA example. t ��0 � � � � � � � 6� � � � �� � �� � �� � �4� 4� RSA encryption is a public-key encryption technology developed by RSA Data Security. � The following table encrypted version to recover the original plaintext message. Encrypt m= 3: EA(m) meA 37 42 (mod 143) c Eli Biham - May 3, 2005 389 Tutorial on Public Key Cryptography { RSA (14) Choose p = 3 and q = 11 ; Compute n = p * q = 3 * 11 = 33 ; Compute Ï(n) = (p - 1) * (q - 1) = 2 * 10 = 20 ; Choose e such that 1 ; e Ï(n) and e and Ï (n) are coprime. Perform encryption and decryption using the RSA algorithm for the following: a. p = 3; q = 11, e = 7; M = 5 b. p = 5; q = 11, e = 3; M = 9 c. p = 7; q = 11, e = 17; M = 8 d. p = 11; q = 13, e = 11; M = 7 e. p = 17; q = 31, e = 7; M = 2 Hint: use some finesse. In this article, we will discuss about RSA Algorithm. Let e = 7 Compute a value for d such that (d * e) % φ(n) = 1. Active 5 years, 8 months ago. l a� � � � " W X � � � � Learn about RSA algorithm in Java with program example. RSA Algorithm- Let-Public key of the receiver = (e , n) Private key of the receiver = (d , n) Then, RSA Algorithm works in the following steps- Step-01: At sender side, RSA is an encryption algorithm, used to securely transmit messages over the internet. RSA algorithm is an asymmetric cryptographic algorithm as it creates 2 different keys for the purpose of encryption and decryption. I tried to apply RSA … The secret deciphering key is the superincreasing 5-tuple (2, 3, 7, 15, 31), m = 61 and a = 17. p=3, q=11, e=3, M=9 And can you also please help me perform the signature generation and verification using RSA algorithm with the following parameters (hash algorithm must not be considered)? Calculate ϕ ϕ (n) = (p - 1) (q - 1). 4) A worked example of RSA public key encryption Letâs suppose that Alice and Bob want to communicate, using RSA technology (Itâs always Give a general algorithm for calculating d and run such algorithm with the above The ASSCII codes corresponding to each alphabet are in the following table: AlphabetASSCII Code (Ai) Decimaly121u117f102e101i105x120u117 V = [(121 + 117 + 102 + 101 + 105 + 120 + 117) mod 23] + 1 = 2 Therefore, I pick the second question in chapter 9. An example of asymmetric cryptography : An example of generating RSA Key pair is given below. Choose n: Start with two prime numbers, p and q. RSA { Encryption/Decryption { Example The encryption algorithm E: Everybody can encrypt messages m(0 m (7, 33) encrypting each letter separately. RSA Example Key Setup 1 Select primes p 17 q 11 2 Compute n pq 17 x 11187 3 from IS 493 at King Saud University. Sr2Jr is community based and need your support to fill the question and answers. 18. In an RSA cryptosystem, p = 7 and q = 11. 120-126, Feb1978 • Security relies on the difficulty of factoring large composite numbers The secret deciphering key is the superincreasing 5-tuple (2, 3, 7, 15, 31), m = 61 and a = 17. t ��0 � � � � � � � 6� � � � �� � �� � �� � �4� 4� equal. Asymmetric actually means that it works on two different keys i.e. They decided to use the public key cryptology algorithm RSA. �      w n n n n n �h^�hgdPY{ Q_9.2 Perform encryption and decryption using the RSA algorithm, as in Figure 9.6 for the following: p=3; q=11; e=7; M=5 Answer: n = p * q = 3 * 11 = 33 f(n) = (p-1) * (q-1) = 2 * 10 = 20 Now, we need to compute d = e-1 mod f(n) by using backward substitution of GCD algorithm: According to GCD: 20 = 7 * 2 + 6 7 = 6 * 1 + 1 6 = 1 * 6 + 0 Therefore, we have: 1 = 7 � 6 = 7 � (20 � 7 * 2) = 7 � 20 + 7 * 2 = -20 + 7 * 3 Hence, we get d = e-1 mod f(n) = e-1 mod 20 = 3 mod 30 = 3 So, the public key is {7, 33} and the private key is {3, 33}, RSA encryption and decryption is following: SHAPE \* MERGEFORMAT p=5; q=11; e=3; M=9 Answer: n = p * q = 5 * 11 = 55 f(n) = (p-1) * (q-1) = 4 * 10 = 40 Now, we need to compute d = e-1 mod f(n) by using backward substitution of GCD algorithm: According to GCD: 40 = 3 * 13 + 1 13 = 1 * 13 + 0 Therefore, we have: 1 = 40 � 3 * 13 Hence, we get d = e-1 mod f(n) = e-1 mod 40 = -13 mod 40 = (27 � 40) mod 40 = 27 So, the public key is {3, 55} and the private key is {27, 55}, RSA encryption and decryption is following: SHAPE \* MERGEFORMAT p=7; q=11; e=17; M=8 Answer: n = p * q = 7 * 11 = 77 f(n) = (p-1) * (q-1) = 6 * 10 = 60 Now, we need to compute d = e-1 mod f(n) by using backward substitution of GCD algorithm: According to GCD: 60 = 17 * 3 + 9 17 = 9 * 1 + 8 9 = 8 * 1 + 1 8 = 1 * 8 + 0 Therefore, we have: 1 = 9 � 8 = 9 � (17 � 9) = 9 � (17 � (60 � 17 * 3)) = 60 � 17*3 � (17 � 60 + 17*3) = 60 � 17 *3 + 60 � 17*4 = 60*2 � 17*7 Hence, we get d = e-1 mod f(n) = e-1 mod 60 = -7 mod 60 = (53-60) mod 60 = 53 So, the public key is {17, 77} and the private key is {53, 77}, RSA encryption and decryption is following: SHAPE \* MERGEFORMAT p=11; q=13; e=11; M=7 Answer: n = p * q = 11 * 13 = 143 f(n) = (p-1) * (q-1) = 10 * 12 = 120 Now, we need to compute d = e-1 mod f(n) by using backward substitution of GCD algorithm: According to GCD: 120 = 11 * 10 + 10 11 = 10 * 1 + 1 10 = 1 * 10 + 0 Therefore, we have: 1 = 11 � 10 = 11 � (120 � 11 * 10) = 11 � 120 + 11 * 10 = -120 + 11 * 11 Hence, we get d = e-1 mod f(n) = e-1 mod 120 = 11 mod 120 = 11 So, the public key is {11, 143} and the private key is {11, 143}, RSA encryption and decryption is following: SHAPE \* MERGEFORMAT p=17; q=31; e=7; M=2 n = p * q = 17 * 31 = 527 f(n) = (p-1) * (q-1) = 16 * 30 = 480 Now, we need to compute d = e-1 mod f(n) by using backward substitution of GCD algorithm: According to GCD: 480 = 7 * 68 + 4 7 = 4 * 1 + 3 4 = 3 * 1 + 1 3 = 1 * 3 + 0 Therefore, we have: 1 = 4 � 3 = 4 � (7 � 4) = 4 � (7 � (480 � 7*68)) = 4 � (7 � 480 + 7*68) = 480 � 7*68 � 7 + 480 � 7*68 = 480*2 � 7*137 Hence, we get d = e-1 mod f(n) = e-1 mod 480 = -137 mod 480 = (343 � 480) mod 480 =343 So, the public key is {7, 527} and the private key is {343, 527}, RSA encryption and decryption is following: SHAPE \* MERGEFORMAT PR= (3, 33) Plaintext 5 ciphertext 14 PU= (7, 33) Plaintext 5 5 Decryption 143 Mod 33 = 5 Encryption 57 Mod 33= 14 93 Mod 55= 14 Encryption 1427 Mod 55 = 9 Decryption Plaintext 9 5 PU= (3, 55) ciphertext 14 Plaintext 9 PR= (27, 55) 817 Mod 77= 57 Encryption 5753 Mod 77 = 8 Decryption Plaintext 8 5 PU= (17, 77) ciphertext 57 Plaintext 8 PR= (53, 77) 711 Mod 143 = 106 Encryption 10611 Mod 143 = 8 Decryption Plaintext 7 5 PU= (11, 143) ciphertext 106 Plaintext 7 PR= (11, 143) 27 Mod 527 = 128 Encryption 128343 Mod 527 = 2 Decryption Plaintext 2 5 PU= (7, 527) ciphertext 128 Plaintext 2 PR= (343, 527) � � � � � � � � � � � � ! 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