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Automatic merge from submit-queue (batch tested with PRs 56290, 57984). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>. kubeadm: more random tokens The strategy of hex encoding a random byte array only uses the following characters: 0123456789abcdef Instead of the entire bootstrapping token character set: 0123456789abcdefghijklmnopqrstuvwxyz Update the token generation to use the entire character set. This increases the token secret from 48 bits of entropy to ~82 bits. 256^8 (1.8e+19) vs. 36^16 (7.9e+24). Noticed this writing https://github.com/kubernetes-incubator/bootkube/pull/663 ```release-note NONE ``` /cc @mattmoyer @luxas