I created an Android project using Eclipse (under Windows FWIW) and let Eclipse create the keypair during the Export Android Application process. I successfully used Eclipse to make a signed release build that is now on the Market. Now I want to now use ProGuard, which I believe means using Ant instead of Eclipse to build. It was a pain, but Ant building works in both debug and release, until it tries to sign the APK. I get: [signjar] jarsigner: Certificate chain not found for: redacted. redacted must reference a valid KeyStore key entry containing a private key and corresponding public key certificate chain. keytool -list -keystore redacted gives me: Keystore type: JKS Keystore provider: SUN Your keystore contains 1 entry redacted, Jan 16, 2011, PrivateKeyEntry, Certificate fingerprint (MD5): BD:0F:70:C1:39:F5:FE:5B:BC:CD:89:0B:C8:66:95:E0 Which brings me to the actual question: where is my public key? I have some sort of public key on my Android Market profile, but is that the pair for my private key? If so, how do I store that in the keystore so that jarsigner will work?