Hi,
I found an openssh private key whilst doing a capture the flag challange and saved it as key.txt to my local machine.
Then I wanted to ssh into the machine to get root.
ssh johndoe@example.com -i key.txt
But I always get the following error message:
johndoe@example.com: Permission denied (publickey).
Retried to ssh into the machine and the error message looks now like this
Load key "id_rsa": invalid format
johndoe@example.com: Permission denied (publickey).
The format looks like this in the file:
-----BEGIN OPENSSH PRIVATE KEY-----
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-----END OPENSSH PRIVATE KEY-----
Can somebody let me know how to troubleshoot this issue?