Hashing Algorithms

Our Self-Sovereign Identity (SSI) solution leverages cryptographic hash functions as a critical security measure. Hashing algorithms play a vital role in ensuring data integrity, safeguarding the accuracy and trustworthiness of information within the ecosystem.

Understanding Hashing

A cryptographic hash function takes an arbitrary input (data) and generates a unique fixed-size string called a hash digest. This digest acts like a digital fingerprint for the data. Any change to the original data, however minor, will result in a completely different hash value.

How Hashing Ensures Data Integrity:

1. Data Integrity Verification: When data is stored or transmitted, its hash value is calculated and stored alongside the data. Upon retrieval, the hash value is recalculated for the received data. If both hash values (original and recalculated) match, it confirms that the data hasn't been tampered with during storage or transit.

2. Verifiable Credential Integrity: Hashing plays a crucial role in AnonCreds within Hyperledger Indy. When a credential is issued, its content is hashed, and this hash becomes part of the credential. During verification, the Verifier can recalculate the hash of the presented credential data and compare it with the stored hash value. This ensures the credential's integrity and prevents any modifications to its content.

Industry-Standard Hashing Algorithms:

TrustGrid utilizes the following industry-standard hashing algorithms:

• SHA-256 (Secure Hash Algorithm 256): This widely adopted algorithm generates a unique 256-bit hash digest for any input data. SHA-256 is known for its collision resistance, meaning it's extremely difficult to generate two different data inputs that produce the same hash value.

• BLAKE2 (Optional): This newer hashing algorithm offers several advantages over SHA-256, including improved performance and potentially stronger collision resistance. While not currently the primary choice, BLAKE2 may be considered as a future option based on ongoing security best practices.

Advantages of Cryptographic Hashing:

• Data Integrity Verification: Hashing provides a reliable mechanism to detect any unauthorized modifications to data, safeguarding its accuracy and trustworthiness.

• Tamper Detection: Even minor changes to data will result in a different hash value, making it easy to identify tampering attempts.

• Enhanced Security: Hashing algorithms are a cornerstone of cryptographic protocols used within AnonCreds and other SSI functionalities, contributing to the overall security of the ecosystem.

By employing robust cryptographic hash functions, our SSI solution prioritizes data integrity and fosters trust within the ecosystem. Users can be confident that their data and credentials remain unaltered and verifiable throughout their interactions.