Even though I think the slides are great, I am flagging this because it looks like Vidcat is just a way of displaying public domain PDFs, except getting ad mone

Even though I think the slides are great, I am flagging this because it looks like Vidcat is just a way of displaying public domain PDFs, except getting ad money for doing it. The submitter has done nothing but submit a bunch of vidcat links in the 4 days he's been on here. The slides themselves are good, but there's places they are quite confusing unless you already know what they're talking about. For example slide 43: they talk about hash functions and birthday paradoxes, but then they conclude that we need to use a "larger MAC". An attacker would not be able to do the birthday attack on the "larger MAC", because they don't know the secret key, so there's no way for them to compute the message groups in the first place. It could be that they're trying to equate MAC and hash function, which would be even worse! For example slide 47, RSA parameters: n, and totient(n) line: public? n is public, yes, totient(n) is not public at all, totient(n) gives you the privkey!