Contents / Clause 7.3
Clause 7.3: Skinny decryption
Text on this site
Title only, body not in the public preview
Citation
ISO/IEC 18033-7:2022, clause 7.3 (contents entry, page 10)
Key date
15 September 2027 Estimated
What the clause requires
Text not in the public preview
The published contents list entry reads ISO/IEC 18033-7:2022, clause 7.3 (contents entry, page 10). The body is not in the sample we can read, so this page states no requirement from it and does not describe it from memory.
What the public text does not state
- The body of clause 7.3
- The inverse round and schedule
What it means for you
The inverse direction for Skinny has its own clause, which is a useful reminder that the standard treats encryption and decryption as separate conformance surfaces. A module can support one direction only, and a product claim that says "Skinny" may mean encryption alone. The buyer s question is which directions the module offers.
The public text does not describe the inverse round, the inverse schedule or the order of operations. The record states that limitation and does not fill it. The evidence request is the same shape as the forward page: a known-answer test for the inverse, or a round trip against the published vector, plus a review note.
This page also carries a procurement point. If a supplier answers "we use Skinny" without naming the direction, the answer is incomplete for any use that needs decryption, which includes most storage and transport uses. The record treats the direction as part of the configuration, not as an implementation detail.
Evidence to keep
| Artefact | Owner | Why it matters |
|---|---|---|
| Known-answer test for the inverse direction or a published-vector round trip | Engineering | Proves the inverse, not just self-consistency. |
| Statement of which directions the module offers | Procurement | A forward-only claim is not enough for most uses. |
| Purchase record for the base standard, so clause 7.3 can be read | Standards owner | The clause is not in the public preview without it. |
How to verify it
Ask whether decryption is supported. If the answer is yes, ask for the inverse test. If it is no, record the limitation.
Dates
The kit plan for clause 7.3 sets the evidence review at 17 June 2027, 90 days before the estimated publication date of 15 September 2027.
Cross references
- 7 Skinny
- 7.2 Skinny encryption
- 7.4 Skinny tweakey schedule
- A.3 Skinny-64/192 example
- A.4 Skinny-128/256 example
- A.5 Skinny-128/384 example
Where this comes from
Source for this page
- ISO/IEC 18033-7:2022, public preview, 11 of 18 pages. Foreword, introduction, clauses 1 to 6.3 and the contents list. Used for every quoted fact about the base text.
- The other sources behind this page are listed on sources.
Retrieved 2026-10-20. Our own statement, cited so you can check it.