I did something similar some time ago, targeting base64 representation instead of cpu instructions:<p><a href="https://ondergetekende.nl/vanity-rsa-public-key.html" rel="nofollow">https://ondergetekende.nl/vanity-rsa-public-key.html</a><p>There's quite a bit of room in an RSA key for arbitrary contents, especially if you don't care about the security of said key.