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What is Java keytool? The Java keytool is a command-line utility used to manage keystores in different formats containing keys and certificates. You can use the java keytool to delete an alias from a keystore. In many respects, the java keytool is a competing utility with openssl for keystore, … [Read more...] about keytool delete alias – How to delete an alias from a keystore

What is Java keytool? The Java keytool is a command-line utility used to manage keystores in different formats containing keys and certificates. You can use the java keytool to change a private key alias in a keystore. In many respects, it’s a competing utility with openssl for keystore, key, and … [Read more...] about keytool alias -changealias – How to change a private key alias

SSL Certificate expiration will occur after the not_after date on the certificate is passed. Now that most of the web is encrypted and depends on SSL certificates, one single expired SSL certificate can cause outages that affect millions of people at once. Or, it may only affect a few people, but … [Read more...] about SSL Certificate Expiration and SSL Certificate Renewal

What are SSL certificates? An SSL certificate is a file containing data about an organization or some entity along with a cryptographically secure public key. The SSL certificate is the centerpiece for providing secure transactions between a client a server by containing the public key for … [Read more...] about What are SSL certificates?

Java SecureRandom lives in the java.security package, at java.security.SecureRandom. The number or value generated by this class is cryptographically strong and the generator is also known as a secure pseudo-random number generator (CSPRNG). Java SecureRandom examples The examples specify … [Read more...] about Java SecureRandom

openssl s_client examples openssl s_client connect Use the openssl s_client -connect flag to display diagnostic information about the ssl connection to the server. The information will include the servers certificate chain, printed as subject and issuer. The end entity server certificate … [Read more...] about openssl s_client commands and examples

A pkcs12 keystore is commonly used for both S/MIME User Certificates and SSL/TLS Server Certificates. They keystore may contain both private keys and their corresponding certificates with or without a complete chain. The keystore’s purpose is to store the credential of an identity, being a person, … [Read more...] about pkcs12

Use the openssl genrsa command to generate an RSA private key. The generated RSA private key can be customized by specifying the cipher algorithm and key size. openssl genpkey vs genrsa The openssl genpkey utility has superseded the genrsa utility. While the genrsa command is still valid and … [Read more...] about openssl genrsa