Ferdous, Md SadekRahat, Razin RayanAhmed, ShahriarTalukder, Abrar AwsafIslam, IlmyChowdhury, Mahpara2024-10-302024-10-30©20242024-01ID 20101001ID 22241145ID 23141077ID 23141082ID 20101607http://hdl.handle.net/10361/24472Cataloged from PDF version of thesis.Includes bibliographical references (pages 42-43).This thesis is submitted in partial fulfillment of the requirements for the degree of Bachelor of Science in Computer Science, 2024.Chat applications are among the most popular Internet applications and a huge number of people use them on a regular basis. As their use has grown, different security and privacy concerns have received attention from the users and the professionals. Many users consider what they chat with their family and friends to be extremely private and they want a certain amount of assurance that their chats are securely exchanged and are not exposed to any unauthorized parties. Towards this aim, many chat applications employ an End-to-End (E2E) Encryption mechanism. This is to safeguard the encryption keys during key exchange as these keys are crucial to ensure the security of the chat histories. Unfortunately, the existing key exchange mechanisms for E2E encryption are prone to Man-in-the-Middle (MITM) attacks. In addition, such mechanisms sometimes use a central server for exchanging keys which raises privacy and security concerns as these central servers may not be trustworthy. In this research, we would like to address these issues, by introducing a novel SSI (Self-sovereign Identity) based End-to-End Chat System which supports a Peer-to-Peer (P2P) key exchange mechanism.43 pagesenBrac University theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission.Self-sovereign identityPeer-to-peerEnd-to-end encryptionVerifiable credentialsDecentralized identityTrust layerKey managementPeer-to-peer computing.End-to-end encryption.Digital identity.Thesis