folder .ssh permissions

# Set public/private key permissions 

# Octal form 

chmod 600 ~/.ssh/id_rsa 

chmod 600 ~/.ssh/id_rsa.pub 

# Equivalent literal form 

chmod u=rw,go= ~/.ssh/id_rsa ~/.ssh/id_rsa.pub 

# Optional: make public key readable 

chmod 644 ~/.ssh/id_rsa.pub 

# 

chmod a=r,u+w ~/.ssh/id_rsa.pub 

# Set directory permissions 

chmod 700 ~/.ssh 

# 

chmod u=rwx,go= ~/.ssh 

# Legend for literal form 

# +: allow -: deny =: reset and allow 

# u: user r: read 

# g: group w: write 

# o: others x: execute 

# a: all source: https://unix.stackexchange.com/questions/257590/ssh-key-permissions-chmod-settings