Three codes could be found hidden in the HTML code of the Message from Acolyte to the Enlightened post on the Investigate Ingress blog.

[1] 8a4tvehxssc8b3r6

[2] 4t7p4ieafcxoe6o9

[3] EMnWndDIExjVBJu1mMfV

Code #1

Observations

Right amount of numbers for a passcode, same old cipher…

Code #2

Observations

Yep, same old cipher again…

Code #3

Observations

20 characters, uppercase, lowercase and numbers. That should be enough to lead you to the right cipher.