# The YouGovern Secure Blockchain-Based Self-Sovereign Identity (SSI) Management and Access Control
While the one who is in control of SSI is the individual, he/she can publish/disseminate information to the press, his/her employer, the healthcare services, security companies, etc. The user can give them whatever data they want and does not give them what he/she does not want. Identity and access control management methods have often changed over time, based on how much privacy they needed to maintain. Over time, there have been several such methods in which their confidentiality has increased over their evolution, such as centralized, federated, self-sovereign, and then blockchain-based self-sovereign. Security primitives, such as public-key encryption and hash functions, are exploited for the implementation of digital identity control. Among other functionalities, they can assure identity-based records' authenticity, attest to their records' integrity, and share records with smart contracts. The long-term goals of self-sovereign identity are [18; 19]:  
1. Decentralization allows entities to manage themselves and eliminates unnecessary targets or single points of failure. It will enable you to control your digital identifiers without relying on external authorities to access your data and sell it to others. 2. Privacy enhances the security of data. 3. Security enables a necessary degree of trust in decentralized identifier (DID) documents. 4. Proof-of-stake allows DIDs to provide identity and information integrity when communicating. 5. Discoverability increases entities' ability to find their self-identity. 6. Interoperability allows existing tools and software to be used. 7. The portability system is system-agnostic, independent, and able to support all types of DIDs and DID methods. 8. Simplicity means it is easy to understand, implement, deploy, and maintain the technology. Credentials, including verification information, are securely stored and are readable by computers. This system offers users the opportunity to maintain their own identities. Documentation requires attestation from another party, but it is attested by the self as well. Documents are signed using digital certificates. The signature provides proof that the identity of the cardholder is genuine. The public key is verified by confirming the private key belonging to the credential's owner. Verifiers trust the issuer; therefore, they approve the certificate. Decentralized identity mechanisms will have a significant impact on business operations and government policymaking in the coming decade [20]. DID uses public-key cryptography to ensure its security (a public and an associated private key). For verifiable claims, DID is enabled for digitally signed verification. An entity issues a bond to a buyer. Several elements are involved in a DID verification, such as a decentralized identifier, a signing key, a collection of authentication methods, a timestamp, and a signature (for integrity). Many projects in the industry, including early ecosystems and consortia, are following this approach, like the decentralized identity base (DIF), Indy Project, Aries Project, and the W3C solution [21]. In some cases, SSI makes sense as a more secure way to authenticate transactions. Critical streamlining workflows lacking standardization of data and communication credentials can be useful in another personal context. Data is a liability and a customer-driven workflow. The central problem addressed by this work is the lack of user-controlled identity systems that are scalable, cost-effective, and compatible with decentralized infrastructure. Existing solutions often depend on centralized verification authorities, lack revocation mechanisms, or operate within permissioned environments. This paper aims to design, implement, and evaluate a decentralized self-sovereign identity system that supports verifiable credentials, privacy-preserving access control, and standards-based interoperability.