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Here's a series of text messages between me and my friend.

Me: Couldn't use ebg13, so used ______ to hide my messages.
Him: What? How is this possible???
Me: A big prime ______, what else did you expect?
Him: Hmm.
Me:(Note: this is multiline. Also, this is not part of the text. See below.)

    ˄
    N
˂ E ? W ˃
    S
    ˅

.________ ƨɒw ɈxɘɈ ƨiʜɈ ƨƨɘυϱ I
Him: You have a secret message! But… it's just incoherent words.
Me: A padlock and a word lock? Oh my!
Him: More encryptions, huh?
Me: yep. bsixfour,spoilthirteen,atcommandlanguage.

What is the code?

HINT

that last text contains the name of three encryptions. Split them up!

HIINT

Only look at my texts. His are just replies.

HIIINT

the first of the last is the answer of the first.

HIVNT

I accidentally flopped the ____ and ____.

HVNT

As with all my puzzles, what goes in the underscores is the same length as the number of underscores.

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  • $\begingroup$ My best guess is that you used a combination of base64 encoding, RSA encryption (with a large prime number), a transposition cipher, a reverse cipher, and possibly other encryption methods to hide your secret message. $\endgroup$
    – suchislife
    Commented May 8 at 3:49
  • $\begingroup$ This ancient thing is one I completely forgot about. It's also really bad. If you want the rep, though… $\endgroup$
    – Someone
    Commented May 8 at 12:26

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