I forgot my ssh passphrase
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I am moving to an Apple Mac and i copied my id_rsa and id_rsa.pub files across to my new machine. When i tried to connect to remote machine over ssh it asked me to enter my password for the ssh key and I have forgotten what it is.

I used a python script to try and get it from my gnome keyring on the old machine i am migrating from but it didn't seem to be in there. 

Any advice would be most welcome.