The keyStore in Java stores private key and certificates corresponding to there public keys and require if you are SSL Server or SSL requires client authentication. In SSL handshake, the purpose of trustStore is to verify credentials and purpose of keyStore is to provide the credential. The only difference between trustStore and keyStore is what they store, and their purpose. TrustStore and keyStore are very much similar in terms of construct and structure as both are managed by keytool command and represented by KeyStore programmatically but they often confuse Java programmers, both beginners and intermediate alike. The trustStore and keyStore are used in the context of setting up SSL connection in Java application between client and server. The keytool command comes with Java installation and its available in the bin directory of JAVA_HOME. By the way, you can use a keytool command to view certificates from trustStore and keyStore. In this Java tutorial, we will explore both keyStore and trustStore and understand the main differences between them. One reason for this could be SSL setup being a one-time job, and not many programmers get the opportunity to do that. That was a one-liner difference between trustStore and keyStore in Java, but no doubt these two terms are quite confusing not just for anyone who is configuring SSL connection in Java for the first time, but also many intermediate and senior level programmers. The main difference between trustStore and keyStore is that trustStore (as name suggest) is used to store certificates from trusted Certificate authorities(CA) which are used to verify certificate presented by Server in SSL Connection, while keyStore is used to store private keys and identity certificates which programs should present to other parties (Server or client) to verify its identity.
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