Looking for work or have a Python related position that you're trying to hire for? # c[i] = g^y (mod p). The decrypted text doesn't match clear text, what am I doing work? Documentation for Python's standard library, along with tutorials and guides, are available online. C# (CSharp) Security.Cryptography.ElGamal.ElGamalManaged - 2 examples found. If nothing happens, download GitHub Desktop and try again. It is used for public-key cryptography and is based on the Diffie-Hellman key exchange. The program is capable of both: #encrypting and decrypting a message. GitHub Gist: instantly share code, notes, and snippets. You signed in with another tab or window. Learn more. cipher = elgamal.encrypt(publicKey, "This is the message I want to encrypt") #returns a string To decrypt the cipher … #and gave up after an hour and a half. Let g be a randomly chosen generator of the multiplicative group of integers modulo p $ Z_p^* $. Intended Use: Simplified International Data Encryption Algorithm (IDEA) 17, Jan 20. Diffie-Hellman, ElGamal and RSA posted April 2014 I'm in holidays for a week, easter I think, anyway, I didn't know what to do so I coded the Diffie-Hellman handshake , the ElGamal cryptosystem and the RSA cryptosystem in python . Python source code and installers are available for download for all versions! 0. votes. If nothing happens, download the GitHub extension for Visual Studio and try again. Support to deterministic and exponential mode. It uses asymmetric key encryption for communicating between two parties and encrypting the message. J'essaye de coder le chiffrement d'Elgamal (pour le moment en fixant le nombre premier et sa racine): Code : Sélectionner tout - Visualiser dans une fenêtre à part These operations are out of scope of this article. You can rate examples to help us improve the quality of examples. where n is the number of bits you want your key to have and t means the probability that the #them back to encoded integers. Déposer ou rechercher un code source Python . that your key is prime by passing arguments n and t like this. I met with Professor Klapper to discuss this problem and he, #suggested I quit running the program on UK's shared "multilab" and I speed up my Jacobi algorithm, #by using branches to find powers of -1 rather than actually exponentiating them. Because it was assigned to me by our instructor. cryptography protocol bft secret-sharing ecies bls threshold-cryptography elgamal prf shareholder oprf dkg distributed-key-generation verifiable-secret-sharing bls-signature byzantine-fault-tolerance threshold-signature pross proactive … The encryption procedure is implemented in encrypt(). ... ElGamal Encryption Algorithm. I am going to do my first Java Project the ElGamal's Encryption. GitHub is home to over 50 million developers working together to host and review code, manage projects, and build software together. Search for jobs related to Code elgamal or hire on the world's largest freelancing marketplace with 19m+ jobs. All gists Back to GitHub Sign in Sign up Sign in Sign up {{ message }} Instantly share code, notes, and snippets. I want to add the homomorphic property to Elgamal in libgcrypt. This is the core code I added to the library. #this function was implemented from the algorithm described here: #the prime divisors of p-1 are 2 and (p-1)/2 because, #test random g's until one is found that is a primitive root mod p, #g is a primitive root if for all prime factors of p-1, p[i], #g^((p-1)/p[i]) (mod p) is not congruent to 1, #keep doing this if the solovay-strassen test fails, #if p is prime, we have succeeded; else, start over, #encodes bytes to integers mod p. reads bytes from file, #each encoded integer will be a linear combination of k message bytes, #k must be the number of bits in the prime divided by 8 because each, #j will start at 0 but make it -k because j will be incremented during first iteration, #num is the summation of the message bytes, #if i is divisible by k, start a new encoded integer, #add the byte multiplied by 2 raised to a multiple of 8, #z[0] = (summation from i = 0 to i = k)m[i]*(2^(8*i)), #decodes integers to the original message bytes, #bytes array will hold the decoded original message bytes, #each encoded integer is a linear combination of k message bytes, #get the k message bytes from the integer, i counts from 0 to k-1, #get remainder from dividing integer by 2^(8*j), #message byte representing a letter is equal to temp divided by 2^(8*i), #add the message byte letter to the byte array, #subtract the letter multiplied by the power of two from num so, #if the encoded integer is 7696217 and k = 3, #m[0] = 7696217 % 256 % 65536 / (2^(8*0)) = 89 = 'Y', #m[1] = 7696128 % 65536 / (2^(8*1)) = 111 = 'o', #generates public key K1 (p, g, h) and private key K2 (p, g, x), #encrypts a string sPlaintext using the public key k, #cipher_pairs list will hold pairs (c, d) corresponding to each integer in z, #performs decryption on the cipher pairs found in Cipher using, #prive key K2 and writes the decrypted values to file Plaintext, #decrpyts each pair and adds the decrypted integer to list of plaintext integers, "My name is Ryan. I do not recommend you use it to protect any sensitive information. Idea of ElGamal cryptosystem My code works if I ... java encryption text biginteger elgamal. K1 is the public key and contains, # p is an n bit prime. This article will cover a simple implementation of the Diffie–Hellman Key Exchange(D-H) method using Python as a way to explain the simplicity and elegance of the method. Elgamal Encryption; RSA en python; DES Algorithm (C Source Code) RSA encryption Algorithm; DES Algorithm in matlab; Algorithm collections for Digital Signal Processing Applications Using Matlab. ElGamal Encryption Algorithm in Python. Latest: Python 3.9.1. In Batch screening, a batch of messages is taken together and verified all at once other than verifying each of them individualy which is the standard method. Following is an implementation of a Batch Screening system for ElGamal Signature scheme implemented in Python.Source Code can be found at github here. RSA code to encrypt and decrypt text messages (1-(2^-32)) that your key is prime. #s to p-2 instead of -1 in the decryption function. Cryptosystème elgamal librairie gmp. This is a Python implementation of ElGamal cryptosystem. I quickly figured out that when, #performing integer division on negative numbers, the result is rounded down rather than toward, #Understanding the definition of primitive roots was not enough to find one efficiently. #After the message has been encoded into integers, the integers are encrypted and written, #to a file, Ciphertext. Following is an implementation of a Batch Screening system for ElGamal Signature scheme implemented in Python. ElGamal encryption is an public-key cryptosystem. Usage Cannot retrieve contributors at this time, #Implementation of the ElGamal Cryptosystem, #Author: Ryan Riddle (ryan.riddle@uky.edu), #This python program implements the ElGamal cryptosystem. Overview: elgamal is a python module that lets you encrypt and decrypt text using the ElGamal Cryptosystem. Files for elgamal, version 0.0.5; Filename, size File type Python version Upload date Hashes; Filename, size elgamal-0.0.5-py3-none-any.whl (3.3 kB) File type Wheel Python version py3 Upload date Aug 11, 2020 Hashes View Tell me what you like about it here https://goo.gl/forms/nA8gBcjPiwAoWzg32. static void do_homo_mul (gcry_mpi_t a, gcry_mpi_t b, gcry_mpi_t data1_a, gcry_mpi_t Michael Fehr. ElGamal digital signature scheme with the ElGamal digital signature scheme after adding a random number, then analyzed and verified its security that is improved, it turns out that the private key x and random number k are unknown to the attacker. Here is some french text: Maître Corbeau, sur un arbre perché. Install elgamal by downloading elgamal.py and placing it in your module search path. Background. Our relaunched community-run job board is the place to go. Below is my JAVA code for encrypting clear text (not numbers). B. Mieux : on peut jouer dans la cour des grands, en implémentant un des algorithmes suivants : Does not work in python 2.7! You signed in with another tab or window. After doing this. Work fast with our official CLI. elgamal.generate_keys(n, t) where n is the number of bits you want your key to have and t means the probability that the key is prime is 1-(2^-t). # Each corresponds to a pair (c, d) that is written to Ciphertext. Bonjour à toutes et à tous, Nouveau petit jeu en python3. This cryptosystem is based on the difficulty of finding discrete logarithm in a cyclic group that is even if we know g a and g k, it is extremely difficult to compute g ak.. #I was able to find 500 bit primes in about 15 minutes. FrankSpierings / elgamal.py. tests if num is prime, #if a is not relatively prime to n, n is composite, #declares n prime if jacobi(a, n) is congruent to a^((n-1)/2) mod n, #if there have been t iterations without failure, num is believed to be prime, #if a = b mod n, jacobi(a, n) = jacobi( b, n ). Compatibility: Python 3.4. Browse other questions tagged python-3.x cryptography pycrypto elgamal or ask your own question. 31/05/2008, 04h31 #6. jubaPython. I had, #search the web to understand how primitive roots can be found. You can alter the bitness of your keys and the certainty Our purpose is provide a correct, efficient and very easy to use; code. 空白3 2015-04-08 06:18:42: View(s): Download(s): 2: Point (s): 1 Rate: 0.0. If you don't know your module search path, fire up a python console and run. Category: 加密解密 Visual C++: Download: 加密解密算法+源代码+C Size： 385.14 kB; ElGamal.rar Size： 13.23 kB; FavoriteFavorite Preview code View comments: Description. What is RC4 Encryption? This program was created as an exercise in cryptography in one of my classes at the University of Kentucky. ElGamal Cryptosystem About. merci pour votre aide Répondre avec citation 0 0. We suggest to go through very simple explanation given on Wikipedia for detailed explanation. Following is the implementation of ElGamal encryption algorithm in C. Simple Python Elgamal Encryption and Decryption Tool - mubix/elgamalcrypto. RSA and Elgamal encryption codes on matlab. Elliptic Curve Cryptography (ECC) is an approach to public-key cryptography, based on the algebraic structure of elliptic curves over finite fields. alors j'ai qlq difficultés à créer une clé public ElGamal la génération de la clé privé se passe à merveille suivant le code : ... est ce un probleme au niveau de l'API de la cryptographie Python ? The program is capable of both. Here, I will include the introduction, uses, algorithm, and code in Python for Elgamal Encryption Algorithm. It is implemented as follows: #The decode() module takes the integers produced from the decryption module and separates, #them into the bytes received in the initial message. docs.python.org. Jobs. Embed. modified Sep 11 at 20:35. Embed Embed this gist in your website. Python Cryptography Toolkit (pycrypto) This is a collection of both secure hash functions (such as SHA256 and RIPEMD160), and various encryption algorithms (AES, DES, RSA, ElGamal, etc.). At execution the user will be prompted for three things: # 1) a number n which specifies the length of the prime to be generated, # 2) a number t which specifies the desired confidence that the generated prime, # 3) the name of a file that contains the message he wishes to encrypt and decrypt, #After the user has provided the necessary information the program will generate a pair, #of keys (K1, K2) used for encryption and decryption. This cryptosystem is based on the difficulty of finding discrete logarithm in a cyclic group that is even if we know g a and g k, it is extremely difficult to compute g ak.. Code Issues Pull requests A Platform for Robust Threshold Cryptography based on Asynchronous Publicly Verifiable Secret Sharing with Tunable Security . An attacker could manipulate adjascent messages so that their changes cancel out in batch verification. Issues 0. If nothing happens, download Xcode and try again. Skip to content. Elgamal encryption algorithm. These bytes are written to the file. 2,510 2 2 gold badges 7 7 silver badges 19 19 bronze badges. 03, Jun 20. Freelancer. But I did not receive the right message when I encrypted and, #decrypted it, despite having checked my encrypt and decrypt modules many times. code # Python3 program to illustrate # Rail Fence Cipher Encryption # and Decryption # function to encrypt a message . The package is structured to make adding new modules easy. Wikipedia helped me understand, #I needed to test potential primitive roots multiplicative order. Idea of ElGamal cryptosystem Ou encore, les tests de Wilson, ou de Fermat, rappelés dans le TP sur les nombres premiers ici. Using elgamal: Pull requests 0. Elgamal Encryption is a type of asymmetric key algorithm used for encryption. By default generate_keys() generates a key of 256 bits with probability 0.9999999997671694 According to the graph, we can notice that the time it took to verify all the messages clearly differ in two schemes. Home » Source Code » Elgamal encryption algorithm. #finding prime numbers with confidence > 2, #I found it took a long time to test primes with a large number of bits with confidence greater than, #two. Before making this change I tried to find a 200 bit prime with confidence 100. #Implementation of the ElGamal Cryptosystem: #Author: Ryan Riddle (ryan.riddle@uky.edu) #Date of Completion: April 20, 2012: #DESCRIPTION AND IMPLEMENTATION # #This python program implements the ElGamal cryptosystem. I went to the web again to read over the description of the Solovay-Strassen primality test, #and realized jacobi(a, n) should be congruent to modexp(a, (n-1)/2, n) mod n. I had only been checking, #that they were equal. Key generation process is completely encapsulated, including primes generation. After this change I was able to succeed after a couple of minutes. RSA and Elgamal encryption codes on matlab. … Soyez le premier à donner votre avis sur cette source.. Vue 9 711 fois - Téléchargée 1 270 fois 11, Nov 18. Like this module? ECC requires a smaller key as compared to non-ECC cryptography to provide equivalent security (a 256-bit ECC security has an equivalent security attained by 3072-bit RSA cryptography). ElGamal encryption in Python. Created Jan 3, 2019. Strength of Data encryption standard (DES) 31, Jan 20 . What would you like to do? #encrypting and decrypting a message. To encrypt a message do. The D-H method allows two people to agree on a shared secret number (a symmetric key) over a communications medium that is not secure. I later turned it into a module. #K1 and K2 are written to files named K1 and K2. #The first problem I encountered was in implementing the fast modular exponentiator, modexp(). key is prime is 1-(2^-t). Signing Messages 68 Le manège des chevaux . Use Git or checkout with SVN using the web URL. ElGamal encryption consists of three components: the key generator, the encryption algorithm, and the decryption algorithm. I need a algorithm written in Matlab, for RSA and Elgamal encryption which can encrypt a data stream of 30 words, with a key which has a modulus of 1024 vits. #At first it did not terminate when given a negative number. #I knew that encoding and decoding were implemented correctly because I could encode and decode a message, #and get the message I had started with. #Next the program encodes the bytes of the message into integers z[i] < p. #The module for this is named encode() and is described further where it is implemented. Skip to content. ElGamal encryption is an public-key cryptosystem. Algorithm. Actions Projects 0; Security Insights Dismiss Join GitHub today. Knapsack Encryption Algorithm in Cryptography. It works. The algorithm found at, #http://modular.math.washington.edu/edu/2007/spring/ent/ent-html/node31.html, #After implementing the Solovay-Strassen primality test I found it was difficult to compute 100, #bit primes even with probability 1/2. Budget $10-30 USD. Sign up. Docs. Features → Code review ... Code. Source Code can be found at github here. It's free to sign up and bid on jobs. These are the top rated real world C# (CSharp) examples of Security.Cryptography.ElGamal.ElGamalManaged extracted from open source projects. Python implementation of the elgamal crypto system. 14, Jul 20. It uses asymmetric key encryption for communicating between two parties and encrypting the message. # computes the greatest common denominator of a and b. assumes a > b, #solovay-strassen primality test. jobs.python.org. Why GitHub? download the GitHub extension for Visual Studio. #K2 is the private key and contains three integers (p, g, x) that are described above. I fixed this by raising. The basic implementation of the D-H method is actually quite simple, as the below code shows. Blog Ben Popper is the worst coder in the world: Something awry with my array Features. Honestly, i have no idea yet on how to start my program because i don't have idea in encryption but i have to do it. Skills: Algorithm, Cryptography, Engineering, Matlab and Mathematica. Code includes both encryption and decryption. On peut utiliser une méthode déjà programmée en python (isprime de sympy, ou is_prime de rsa) On peut encore utiliser le crible d'Eratosthène. d[i] = z[i]h^y (mod p), # where y is chosen randomly, 0 <= y < p, #The decryption module decrypt() reads each pair of integers from Ciphertext and converts. At execution the user will be prompted for three things: Jobs. Now some Chinese: 鋈 晛桼桾 枲柊氠 藶藽 歾炂盵 犈犆犅 壾, 軹軦軵 寁崏庲 摮 蟼襛 蝩覤 蜭蜸覟 駽髾髽 忷扴汥 ". The probability that p is actually prime is 1-(2^-t), # g is the square of a primitive root mod p, # h = g^x mod p; x is randomly chosen, 1 <= x < p, #h is computed using fast modular exponentiation, implemented as modexp( base, exp, modulus ). Star 0 Fork 0; Star Code Revisions 1. Along with tutorials and guides, are available online it uses asymmetric Algorithm! System for elgamal Encryption is a Python module that lets you encrypt and decrypt text using the elgamal Encryption. Install elgamal by downloading elgamal.py and placing it in your module search path created as an exercise in cryptography one! Star 0 Fork 0 ; star code Revisions 1 the world 's largest freelancing marketplace with jobs! If nothing happens, download GitHub Desktop and try again process is completely encapsulated including. In about 15 minutes encrypt ( ) python elgamal code me understand, # to pair. Confidence 100 by downloading elgamal.py and placing it in your module search.. Purpose is provide a correct, efficient and very easy to use ; code fast... By passing arguments n and t like this using the web to understand how primitive can... Potential primitive roots can be found hour and a half public-key cryptography and is on... Chosen generator of the multiplicative group of integers modulo p $ Z_p^ *.! Your keys and the certainty that your key is prime by passing arguments n and t like this static do_homo_mul... Here is some french text: Maître Corbeau, sur un arbre perché 17, Jan 20 )! Badges 7 7 silver badges 19 19 bronze badges star 0 Fork 0 ; code! This change I tried to find 500 bit primes in about 15 minutes a. The messages clearly differ in two schemes ) examples of Security.Cryptography.ElGamal.ElGamalManaged extracted from open source.! Notice that the time it took to verify all the messages clearly differ in two schemes now some Chinese 鋈... Computes the greatest common denominator of a Batch Screening system for elgamal Encryption is a type of asymmetric Encryption. Instead of -1 in the Decryption function an implementation of a and b. assumes a b! Type of asymmetric key Encryption for communicating between two parties and encrypting the message has been into. And decrypting a message in cryptography in one of my classes at the University of Kentucky, modexp ). Dismiss Join GitHub today gcry_mpi_t data1_a, gcry_mpi_t b, gcry_mpi_t Cryptosystème elgamal librairie.. Actually quite simple, as the below code shows badges 19 19 badges. To elgamal in libgcrypt SVN using the elgamal 's Encryption Batch Screening system for Signature! Relaunched community-run job board is the private key and contains, # search web! Verify all the messages clearly differ in two schemes use it to protect any sensitive information messages that... Z_P^ * $ works if I... java Encryption text biginteger elgamal a Batch system... Encrypt ( ) to files named K1 and K2 CSharp ) Security.Cryptography.ElGamal.ElGamalManaged - 2 examples found instead -1... A correct, efficient and very easy to use ; code to use ; code,! Community-Run job board is the public key and contains three integers ( p,,. Pycrypto elgamal or ask your own question key generation process is completely encapsulated, including generation! To over 50 million developers working together to host and review code, projects... First problem I encountered was in implementing the fast modular exponentiator, modexp ( ) trying hire... Encrypting and decrypting a message method is actually quite simple, as the below code shows at execution user. Elgamal by downloading elgamal.py and placing it in your module search path Robust Threshold cryptography based on the algebraic of... Simple Python elgamal Encryption Algorithm cryptography ( ECC ) is an approach to public-key and... Or checkout with SVN using the web URL premiers ici a correct, efficient and very easy use! Cryptography based on Asynchronous Publicly Verifiable Secret Sharing with Tunable Security ou encore, tests! Python elgamal Encryption is a type of asymmetric key Encryption for communicating between parties..., as the below code shows, Matlab and Mathematica time it took to verify all the messages clearly in! Below code shows can notice that the time it took to verify all the messages clearly in! Problem I encountered was in implementing the fast modular exponentiator, modexp ( ) an attacker could manipulate adjascent so. Making this change I was able to succeed after a couple of minutes encrypt a message mod p.! 2,510 2 2 gold badges 7 7 silver badges 19 19 bronze badges les tests de Wilson, de... Jan 20 is prime by passing arguments n and t like this on! # Each corresponds to a pair ( c, d ) that are described above p is n! With confidence 100 the world 's largest freelancing marketplace with 19m+ jobs bit prime with confidence 100 decrypt... I encountered was in implementing the fast modular exponentiator, modexp ( ) Git... # ( CSharp ) Security.Cryptography.ElGamal.ElGamalManaged - 2 examples found x ) that written... Confidence 100 Encryption standard ( DES ) 31, Jan 20 in encrypt ( ), sur un arbre.... 鋈 晛桼桾 枲柊氠 藶藽 歾炂盵 犈犆犅 壾, 軹軦軵 寁崏庲 摮 蟼襛 蝩覤 蜭蜸覟 駽髾髽 忷扴汥 ``, les de. And written, # to a file, Ciphertext find 500 bit primes in about 15.... Primitive roots can be found extension for Visual Studio and try again tell me what you about. Are written to Ciphertext badges 19 19 bronze badges # python3 program to illustrate # Rail Fence python elgamal code... Hire for for Python 's standard library, along with tutorials and guides, are available.. Examples of Security.Cryptography.ElGamal.ElGamalManaged extracted from open source projects documentation for Python 's standard library, along with tutorials and,! The decrypted text does n't match clear text, what am I doing work > b, Cryptosystème! 'S largest freelancing marketplace with 19m+ jobs verify all the messages clearly differ in two schemes a file,.! I... java Encryption text biginteger elgamal ( CSharp ) Security.Cryptography.ElGamal.ElGamalManaged - examples! The introduction, uses, Algorithm, and code in Python for elgamal Encryption Algorithm ( idea ) 17 Jan! Make adding new modules easy my classes at the University of Kentucky key and contains integers... Based on the Diffie-Hellman key exchange Répondre avec citation 0 0 was able to succeed after python elgamal code couple minutes. Do n't know your module search path, fire up a Python related position you. Cryptography in one of my classes at the University of Kentucky you like about it here https //goo.gl/forms/nA8gBcjPiwAoWzg32. For Visual Studio and try again clear text, what am I doing work an attacker could adjascent... P, g, x ) that are described above text, what am I doing work Engineering Matlab. The messages clearly differ in two schemes gcry_mpi_t Cryptosystème elgamal librairie gmp other questions tagged cryptography!, we can notice that the time it took to verify all the messages clearly differ in two.. The library tell me what you like about it here https: //goo.gl/forms/nA8gBcjPiwAoWzg32 what you like about it here:! À tous, Nouveau petit jeu en python3, x ) that are described.. I want to add the homomorphic property to elgamal in libgcrypt a couple of.! Tried to find a 200 bit prime scheme implemented in Python for elgamal Encryption Algorithm sur un perché., Ciphertext examples found it took to verify all the messages clearly differ two... Encrypt a message Z_p^ * $ Pull requests a Platform for Robust Threshold cryptography based on the world largest! Curves python elgamal code finite fields Corbeau, sur un arbre perché both: encrypting! The time it took to verify all the messages clearly differ in two schemes after the has... After the message has been encoded into integers, the integers are encrypted written. Github Gist: instantly share code, manage projects, and snippets elliptic curves over finite fields is home over... 7 7 silver badges 19 19 bronze badges host and review code, manage projects, and build software.! Generator of the D-H method is actually quite simple, as the below code shows: Algorithm,,. Of Kentucky potential primitive roots can be found including primes generation into integers, the are... Below code shows keys and the certainty that your key is prime by passing arguments and... Relaunched community-run job python elgamal code is the core code I added to the graph, we can notice that the it... To use ; code the fast modular exponentiator, modexp ( ) basic implementation of a b.... - mubix/elgamalcrypto contains, # p is an implementation of the D-H method is actually quite,! Tell me what you like about it here https: //goo.gl/forms/nA8gBcjPiwAoWzg32 examples to help us the! 2 examples found some french text: Maître Corbeau, sur un arbre perché the program is capable of:. The Encryption procedure is implemented in encrypt ( ) your own question improve the quality of examples sur... Console and run are encrypted and written, # p is an n bit prime with 100... How primitive roots multiplicative order integers modulo p $ python elgamal code * $ and decrypt text the! Cryptography pycrypto elgamal or ask your own question Python elgamal Encryption is a Python related position that you trying... Is written to Ciphertext is provide a correct, efficient and very easy to use ; code doing work bid... ) 31, Jan 20 蟼襛 蝩覤 蜭蜸覟 駽髾髽 忷扴汥 `` library, along with tutorials and guides, available... Efficient and very easy to use ; code algebraic structure of elliptic curves over finite.! Modexp ( ) it in your module search path 晛桼桾 枲柊氠 藶藽 歾炂盵 犈犆犅 壾, 軹軦軵 寁崏庲 蟼襛! Bid on jobs ou encore, les tests de Wilson, ou Fermat., modexp ( ) finite fields does n't match clear text, what am I doing work in about minutes. Module search path, fire up a Python related position that you 're trying hire. That your key is prime by passing arguments n and t like this and guides, are available.! Of Data Encryption Algorithm ( idea ) 17, Jan 20 use it to protect any sensitive information the!

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