In my secrets folder I have these files
-rw-r--r-- 1 root root 272 Oct 2 11:07 hudson.console.AnnotatedLargeText.consoleAnnotator
-rw-r--r-- 1 root root 48 Sep 23 11:40 hudson.console.ConsoleNote.MAC
-rw-r--r-- 1 root root 32 Sep 23 11:42 hudson.model.Job.serverCookie
-rw-r--r-- 1 root root 272 Sep 23 11:39 hudson.util.Secret
-rw-r--r-- 1 root root 32 Sep 23 11:16 jenkins.model.Jenkins.crumbSalt
-rw-r--r-- 1 root root 256 Sep 23 11:16 master.key
-rw-r--r-- 1 root root 272 Sep 23 11:16 org.jenkinsci.main.modules.instance_identity.InstanceIdentity.KEY
-rw-r--r-- 1 root root 272 Sep 23 11:49 org.jenkinsci.plugins.workflow.log.ConsoleAnnotators.consoleAnnotator
-rw-r--r-- 1 root root 48 Sep 23 11:39 org.springframework.security.web.authentication.rememberme.TokenBasedRememberMeServices.mac
In my case hudson.utils.secrets is binary
od -h hudson.util.Secret
0000000 5f25 eee1 0763 1b49 c074 ee22 af85 4e10
0000020 00cf dd32 b568 fae3 257a 8d6e 1e56 d995
I installed groovy,I looked at HOW TO DECRYPT FROM CREDENTIALS What should I do?