Hello, I'm using openssl command-line in a Linux-Box (CentOS 6.x with squid) like this: I havn't defined anything - everything is set default from the linux distribution openssl req -new -newkey rsa:2048 -subj '/CN=Squid SSL-Bump CA/C=/O=/OU=/' -sha256 -days 365 -nodes -x509 -keyout ./squidCA.pem -out ./squidCA.pem the question: where does the serial number for this certificate come from? is it random by default when nothing is said about it? would this be also an option when using openssl like this: openssl ca -batch -config any.cnf -name any_ca -md sha256 -startdate ... -enddate ... .... Thanks. -- Best regards, Ing. Walter H?hlhubmer -------------- next part -------------- A non-text attachment was scrubbed... Name: smime.p7s Type: application/pkcs7-signature Size: 4312 bytes Desc: S/MIME Cryptographic Signature URL: <http://mta.openssl.org/pipermail/openssl-users/attachments/20150705/aa7aadd0/attachment.bin>