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Assessment Title
Rule Text
The digital signature algorithm used for DNSSEC-enabled zones must be set to use RSA/SHA256 or RSA/SHA512.
Description
Discussion Text
The choice of digital signature algorithm will be based on recommended algorithms in well-known standards. NIST's Digital Signature Standard (DSS) (FIPS186) provides three algorithm choices:
- Digital Signature Algorithm (DSA);
- RSA;
- Elliptic Curve DSA (ECDSA).
Of these three algorithms, RSA and DSA are more widely available, and hence are considered candidates of choice for DNSSEC. In terms of performance, both RSA and DSA have comparable signature generation speeds, but DSA is much slower for signature verification. Hence, RSA is the recommended algorithm as far as this guideline is concerned. RSA with SHA-1 is currently the only cryptographic algorithm mandated to be implemented with DNSSEC, although other algorithm suites (e.g., RSA/SHA-256, ECDSA) are also specified. It can be expected that name servers and clients will be able to use the RSA algorithm at the minimum. It is suggested that at least one ZSK for a zone use the RSA algorithm.
SHA-256, SHA-384, and SHA-512 are approved hash algorithms to be used as part of the algorithm suite for generating digital signatures. It is expected that there will be support for Elliptic Curve Cryptography in the DNSSEC.
- Digital Signature Algorithm (DSA);
- RSA;
- Elliptic Curve DSA (ECDSA).
Of these three algorithms, RSA and DSA are more widely available, and hence are considered candidates of choice for DNSSEC. In terms of performance, both RSA and DSA have comparable signature generation speeds, but DSA is much slower for signature verification. Hence, RSA is the recommended algorithm as far as this guideline is concerned. RSA with SHA-1 is currently the only cryptographic algorithm mandated to be implemented with DNSSEC, although other algorithm suites (e.g., RSA/SHA-256, ECDSA) are also specified. It can be expected that name servers and clients will be able to use the RSA algorithm at the minimum. It is suggested that at least one ZSK for a zone use the RSA algorithm.
SHA-256, SHA-384, and SHA-512 are approved hash algorithms to be used as part of the algorithm suite for generating digital signatures. It is expected that there will be support for Elliptic Curve Cryptography in the DNSSEC.
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