Linux Package Signing and Verification: gpg, sha256sum, and rpm --checksig

🛡️ Why Package Verification Matters

Verifying packages ensures:

• Authenticity: Confirm the source is trusted

• Integrity: Detect tampering or corruption

• Security: Prevent malicious code injection

🔐 Verifying with GPG

Import public key:
bash
gpg --import public.key

Verify signature:
bash
gpg --verify package.tar.gz.sig package.tar.gz

List keys:
bash
gpg --list-keys

🔍 Checking Hashes with sha256sum

Generate hash:
bash
sha256sum package.tar.gz

Compare with published hash:
bash
diff <(sha256sum package.tar.gz) expected_hash.txt

📦 RPM Signature Check

Verify RPM package:
bash
rpm --checksig package.rpm

•  

• Output will show if the package is signed and valid

🧠 Pro Tips

• Always download keys from trusted sources

• Use gpg --recv-keys with keyserver for automation

• Use sha256sum -c to verify multiple files at once

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