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I tried to codesign my app by following way, we downloaded the certificate from apple developer account and We tried to sign the binaries with the downloaded certificate using codesign command . line command (sudo codesign -f -vv -o runtime --deep --timestamp -s  "Developer Id Cer: user(123455)" try.dylib) I have received the following error Though I have added the certificate in keychain access and also checked that the certificate is valid, I still got**”The specified item could  not be found in the keychain”** . Then I tried same scenario with other certificate but got following error                               Warning: unable to build chain tp self-signed root for signer "Developer Id Cer: user(123456)”                                   try.dylib: errSecInternalComponent Any help would be really appreciated