Notes ·
LetsSeal Makes File Integrity Verification Simple
LetsSeal is an open source tool for creating cryptographic seals that let anyone verify whether a file has been modified after it was published.
Instead of encrypting a file, LetsSeal generates a cryptographic proof that can later be checked against the original. If even a single byte changes, the verification fails. That makes it useful for distributing software, documents, backups or any other files where recipients need confidence that what they received is exactly what the publisher intended.
I like projects like this because they focus on authenticity rather than secrecy. Most files don't need to be hidden, but they do need to be trustworthy. Being able to independently verify that a download hasn't been altered is becoming more important as software supply-chain attacks become more common.
Combined with services like Inkless for signing documents, tools like LetsSeal give individuals and small organizations practical ways to establish trust without relying entirely on large commercial platforms. One proves that a document was intentionally signed, while the other proves that a file hasn't changed since it was sealed.
The more these kinds of open tools become part of everyday workflows, the easier it becomes to verify what you're downloading instead of simply trusting where it came from.