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Also known as: DSA
A U.S. Federal standard digital signature scheme based on discrete logarithms in finite fields.
DESCRIPTION
The Digital Signature Algorithm (DSA) is a standardized asymmetric signature scheme defined in FIPS 186. It uses discrete logarithms over finite fields with per-message randomness to produce signatures. Security depends on strong parameter selection, cryptographic hashes, and high-quality nonces. Modern practice often favors ECDSA and EdDSA for performance and robustness, though DSA remains part of the Digital Signature Standard. DSA signatures appear in legacy systems and certain compliance-driven environments.
ALTERNATIVE DEFINITIONS
Wikipedia
The Digital Signature Algorithm (DSA) is a Federal Information Processing Standard for digital signatures.
Emphasizes DSA as an official federal standard.
NIST
This publication specifies the Digital Signature Standard (DSS), including the Digital Signature Algorithm (DSA), Elliptic Curve Digital Signature Algorithm (ECDSA), and Edwards-curve Digital Signature Algorithm (EdDSA).
Current authoritative standard covering DSA alongside ECDSA and EdDSA.
RELATED TERMS
Digital Signature Hash Function MAC Asymmetric Encryption Key Generation TLS X.509 Certificate FIPS 186
COMPETING TERMS
RELATIONS
- Broader: Algorithm
KNOWLEDGE AREAS
Data Security Software Engineering Data Privacy & Compliance
TARGET AUDIENCE
Security Architect Cybersecurity Engineer Software Developer DevOps Engineer Chief Information Security Officer
EXTERNAL SOURCES
- Wikipedia - Digital Signature Algorithm
- NIST - FIPS 186-5 digital signature standard
- OpenSSL - OpenSSL DSA overview and usage
TOP QUESTIONS
Why is the Digital Signature Algorithm less common today?
ECDSA and EdDSA typically offer better performance and simpler nonce handling. Many systems migrated to elliptic-curve signatures for efficiency and security engineering reasons.
Category: Relevancy
What are common mistakes with the Digital Signature Algorithm?
Reusing or biasing the per-message nonce compromises private keys. Weak hash choices and poor parameter validation also weaken security.
Category: Mistakes
Where is the Digital Signature Algorithm still used?
In legacy applications, certain FIPS-oriented environments, and contexts requiring compatibility with older systems.
Category: Example
What is required to implement the Digital Signature Algorithm securely?
High-quality randomness for nonces, approved hash functions, validated parameters, and robust side-channel mitigations are essential.
Category: Requirements
How does the Digital Signature Algorithm compare to ECDSA?
Both are standardized, but ECDSA achieves similar security with smaller keys and faster operations due to elliptic-curve efficiency.
Category: Alternatives
Does the Digital Signature Algorithm provide non-repudiation?
DSA signatures can support non-repudiation when combined with proper key management, certification, and legal frameworks.
Category: Opinion
What hashes are recommended with the Digital Signature Algorithm?
Modern deployments use SHA-2 or SHA-3 families, adhering to FIPS 186-5 guidance and application requirements.
Category: Management
How does the Digital Signature Algorithm generate signatures?
It uses discrete logarithm operations over finite fields and a per-message random nonce to compute signature components.
Category: Example
What risks arise if nonce generation fails in the Digital Signature Algorithm?
Nonce reuse reveals private keys, enabling full signature forgeries and catastrophic compromise.
Category: Risk