Joel Eriksson
Vulnerability researcher, exploit developer and reverse-engineer. Have spoken at BlackHat, DefCon and the RSA conference. CTF player. Puzzle solver (Cicada 3301, Boxen)


Ashley Madison: Sex, lies & scandal (Netflix 2024)


What would I have done differently, knowing what I know now…
Ashley Madison Post-Mortem


Some articles about me and/or my research, in English:

Some articles about me and/or my research, in Swedish:

For more information about Cicada 3301 and my solutions for the 2012 challenge, go to:

If these kinds of puzzles and challenges interest you, you might also be interested in looking at the old GCHQ challenge:
GCHQ: solve the online code, become a real-life spy

My solutions for that challenge are available here:

Note that the GCHQ challenge is a bit more technical in nature than the Cicada 3301 puzzles, so it might not be for everyone. ;)

For those of you that are into that sort of stuff, you might take a look at my CTF challenge writeups:

/ Joel Eriksson <je at clevcode dot org>