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# System Transparency Front-End (STFE)
STFE is a [Trillian](https://transparency.dev/#trillian)
[personality](https://github.com/google/trillian/blob/master/docs/Personalities.md)
-that allows you to log signed checksums. What a checksum covers is up to the
-submitter. For example, it could be a Firefox update, a Debian package, or a
-document. A log leaf contains:
-- A _checksum_ that covers something opaque, e.g., an executable binary.
-- An _identifier_ that is tied to what the checksum represents, e.g., name,
-version, and platform.
+that allows you to log signed checksums. What a checksum represents is up to
+the submitter. For example, it could be a Firefox update, a Debian package, or
+a document. A log leaf contains:
+- A _checksum_ that represents a data item of opaque type.
+- An _identifier_ that is tied to what the checksum represents.
- A _signature_ that covers `checksum` and `identifier` using the submitter's
secret signing key.
- A _namespace_ that is tied to the submitter's verification key, e.g., think of
@@ -87,10 +86,10 @@ checksums. As far as we can tell the log's leaf entry must at minimum indicate:
2. What opaque data does the checksum _refer to_ such that the log entry can be
analyzed by monitors.
-Additional metadata needs can be included in the data that the checksum covers,
-and the data itself can be stored in a public unauthenticated archive. Log APIs
-and data formats should also follow the principle of minimal common denominator.
-We are still in the process of analyzing this further.
+Additional metadata needs can be included in the data that the checksum
+represents, and the data itself can be stored in a public unauthenticated
+archive. Log APIs and data formats should also follow the principle of minimal
+common denominator. We are still in the process of analyzing this further.
### Spam and log poisoning
Trillian personalities usually have an _admission criteria_ that determines who