How do I use keygen?
I have received several questions in office hours about how
keygen is used.
keygen is a helper function for generating valid keys for your
subst_decrypt functions. You should not use
subst_decrypt functions. Instead, as shown in
the lab examples, both of those functions take the key, generated previously by
keygen, as a parameter. For example:
key = keygen("mypassword") encrypted = subst_encrypt("this is a secret message", key) decrypted = subst_decrypt(encrypted, key) print(decrypted)
Notice that the
key produced by
keygen is used as the second parameter to
subst_decrypt. More specifically, your code should
produce the exact same output as below, that is given a string and a key,
your function should be able to encrypt or decrypt the message (without using
>>> subst_encrypt("this is a secret message", "jf rdesquztkwhoipcbamlvxgny") 'aqubyubyjybd cdaywdbbjsd' >>> subst_decrypt("aqubyubyjybd cdaywdbbjsd", "jf rdesquztkwhoipcbamlvxgny") 'this is a secret message'