https://github.com/simonskodt/secu1-elgamal

Mandatory handin 1 in Security 1. The goal is to implement the ElGamal public key method.
https://github.com/simonskodt/secu1-elgamal

elgamal encryption-decryption

Last synced: 8 months ago
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Mandatory handin 1 in Security 1. The goal is to implement the ElGamal public key method.

• Host: GitHub
• URL: https://github.com/simonskodt/secu1-elgamal
• Owner: simonskodt
• License: mit
• Created: 2022-09-23T11:23:33.000Z (about 3 years ago)
• Default Branch: main
• Last Pushed: 2022-10-03T07:54:30.000Z (about 3 years ago)
• Last Synced: 2025-01-04T11:12:17.202Z (9 months ago)
• Topics: elgamal, encryption-decryption
• Language: C#
• Homepage:
• Size: 127 KB
• Stars: 1
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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# ElGamal public key method

**Mandatory exercise 1 in Security 1. The goal is to implement the ElGamal public key method. The assignment is the following:**

- [x] You are Alice and want to send 2000 kr. to Bob through a confidential message. You decide to use the ElGamal public key method. The keying material you should use to send the message to Bob is as follows:

   * The shared base g=666

   * The shared prime p=6661

   * Bob’s public key PK = gx mod p =2227

   Send the message ’2000’ to Bob.

- [x] You are now Eve and intercept Alice’s encrypted message. Find Bob’s private key and reconstruct Alice’s message.

- [x] You are now Mallory and intercept Alice’s encrypted message. However, you run on a constrained device and are unable to find Bob’s private key. Modify Alice’s encrypted message so that when Bob decrypts it, he will get the message ’6000’.