A possible way to encrypt a secret key only using base

enc.py

aws_secret_access_key = "BmUejjI9Fp23FAOJoijeRAJse/fAEIfo4FAJFIwe"

#It is absolutely infeasible to find a string which hashes to something
#that even remotely resembles your aws_secret_access_key.

the_password_I_will_enter = "MySecretPassword"

#Note that the_password_I_will_enter is a string rather than a bytes object:
"""
>>> isinstance("MySecretPassword", str)
True
>>> isinstance("MySecretPassword", bytes)
False
"""

#Hence, we have to first convert it to a bytes object before computing its
#md5 hash.
"""
>>> md5(b"MySecretPassword").hexdigest()
'7315a012ecad1059a3634f8be1347846'
"""

#Now observe that "B", "m", "U" aren't even in the hash value, so you would
#have to apply another transformation in order to create them from the hash
#value.

#This would get complicated, but it is entirely feasible.