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You need to authenticate and join a team to post writeups mitinarsenyApril 3, 2019, 10:18 a.m.

There is much more simple solution:
$ echo "cat\ flag" | base64 | pbcopy
$ nc ... # connect via nc
$ 1 sign
$ <paste from clipboard>
$ <copy output signature>
$ <paste signature> cat\ flag
Here you are.