# New Chainguard Academy tutorial: Cosign the manual way

DevFeed: [New Chainguard Academy tutorial: Cosign the manual way](<https://devfeed.tech/articles/new-chainguard-academy-tutorial-cosign-the-manual-way-13173.md>)

Original publisher: [Read original article](<https://www.chainguard.dev/unchained/new-chainguard-academy-tutorial-cosign-the-manual-way>)

Published: 2023-03-30T00:00:00Z

Content type: tutorial

Language: en

Sources: [Chainguard: Unchained](<https://devfeed.tech/sources/chainguard-unchained.md>)

Topics: [Tutorial](<https://devfeed.tech/topics/tutorial.md>), [sigstore](<https://devfeed.tech/topics/sigstore.md>), [Security](<https://devfeed.tech/topics/security.md>), [supply-chain-security](<https://devfeed.tech/topics/supply-chain-security.md>), [Command-line interface](<https://devfeed.tech/topics/cli.md>), [Software](<https://devfeed.tech/topics/software.md>)

Tags: [algorithm](<https://devfeed.tech/tags/algorithm.md>), [chainguard](<https://devfeed.tech/tags/chainguard.md>), [chainguard-academy](<https://devfeed.tech/tags/chainguard-academy.md>), [cli](<https://devfeed.tech/tags/cli.md>), [cosign](<https://devfeed.tech/tags/cosign.md>), [rekor](<https://devfeed.tech/tags/rekor.md>), [rsa](<https://devfeed.tech/tags/rsa.md>), [security](<https://devfeed.tech/tags/security.md>), [sha-256](<https://devfeed.tech/tags/sha-256.md>), [signing](<https://devfeed.tech/tags/signing.md>), [sigstore](<https://devfeed.tech/tags/sigstore.md>), [software-artifact-signing](<https://devfeed.tech/tags/software-artifact-signing.md>), [transparency-log](<https://devfeed.tech/tags/transparency-log.md>), [trust](<https://devfeed.tech/tags/trust.md>), [tutorial](<https://devfeed.tech/tags/tutorial.md>), [verify](<https://devfeed.tech/tags/verify.md>)

## AI overview

This article introduces a Chainguard Academy tutorial that explains Cosign's blob-signing capabilities. It covers generating an RSA key pair, signing data with SHA-256, uploading signatures to the Rekor transparency log, and verifying the signature.

## Source excerpt

New Chainguard Academy tutorial unpacks Cosign the manual way and explores Cosign's blob signing capabilities.