A signer certificate is the trusted certificate entry that is usually in a truststore file. You can import a certificate authority (CA) root certificate from the CA, or a public certificate from the self-signed personal certificate of the target into your truststore file, as a signer certificate.
Read the documentation located in http://www.ibm.com/developerworks/java/jdk/security/iKeymanDocs.zip file for further information.
ResultThe Signer Certificates field now displays the label of the signer certificate you just added. Receive a CA root certificate or the public key from your secure target.
Related concepts
Secure Sockets Layer
Related tasks
Creating truststore files