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There isn’t enough information to establish either claim: the implementation, its target Ascon variant, and its test results are not identified. The standard to assess it against is NIST SP 800-232, published on August 13, 2025. To make a credible claim, first show that your code conforms to the specific standardized function it targets; then define a narrow scope and compare it with dated public implementations.
What “Ascon implementation” means under the final standard
NIST SP 800-232 specifies four functions: Ascon-AEAD128, Ascon-Hash256, Ascon-XOF128, and Ascon-CXOF128. “Ascon” alone does not identify which function your code implements, or which version of the design it follows.
That version distinction matters. Earlier submitted Ascon designs are not necessarily compatible with the NIST-standard versions. The Ascon C reference repository identifies changes from the submission, including a change in endianness and updated initial values. A project labeled simply “Ascon” might implement an earlier design, so check its stated target rather than inferring compatibility from the name.
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What evidence would support “fully correct”?
Correctness means more than producing expected output for a few ordinary inputs. Start with the normative requirements in SP 800-232, then test the specific function and version your implementation claims to support. The Ascon C repository provides reference implementations and known-answer-test files for the standardized algorithms; these offer useful comparison points, but resemblance to reference code does not itself establish conformance.
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Record the evidence so another person can reproduce the result. Include:
- The exact SP 800-232 function and version targeted.
- The test-vector source, test cases, and input boundaries covered.
- The language, target architecture, compiler, and relevant toolchain settings.
- Whether testing covered only functional outputs or also applicable implementation requirements.
Passing known-answer tests is valuable evidence, but it is not proof that every requirement has been met. The ACVP Ascon Internet-Draft says its tests do not cover the additional requirements in SP 800-232 section 4.3. The draft is a testing document in progress, not a replacement for the final standard.
How to assess a claim that it is “the first”
Priority is only meaningful within a defined scope. “First Ascon implementation” could refer to any of four functions, a programming language, a hardware architecture, or a property such as side-channel protection. A broad claim is difficult to verify when the scope is unstated and implementation catalogs include projects across software and hardware.
- State the scope: name the function, the NIST standard version, and any language, platform, or security-property limits. For example, a claim might concern the first implementation of one named SP 800-232 function in a specified language.
- Find dated comparison candidates: use the Ascon project’s implementation collection as a starting directory, then inspect each candidate’s stated version and publication history. The collection cautions that linked implementations may be outdated or incorrect; inclusion is not proof of conformance.
- Compare like with like: distinguish implementations of the standardized version from those of earlier submissions, and compare the same function and scope. A reference implementation helps with behavioral checks; it does not settle historical priority.
- Qualify the conclusion: say “first known to us” only if your search supports that phrasing, and describe the scope and date. Do not turn a limited search into an unqualified first-ever claim.
Keep correctness, security, and performance claims separate
Functional conformance, security protections, and speed are different properties. If you claim side-channel protections, identify what was implemented and evaluated; passing functional vectors does not demonstrate those protections. Likewise, being correct does not establish that an implementation is faster or otherwise better than another. NIST’s selection process considered third-party analysis, implementation, and benchmarking, underscoring that these are separate lines of evidence.
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Without its repository or code, revision, target function and version, platform, and test results, neither correctness nor priority can be verified. The evidence needed for a useful assessment is concrete: identify the exact standardized target, show reproducible tests against known-answer vectors, explain the limits of those tests, and document the scope and dated comparisons behind any first claim.
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