I feel so nerdy for understanding this video.

Damn, now i understand that i don't understand logarithms.

I'm daltonist, I can't get it!!!!

finally i understand private key vpn encryption.

No,no, it's easy. You just need to subtract the second number by the first number. HOLYMOTHEROFGOD I'M BRILLIANT

#4 When you see a "hacker" in a movie or TV show decrypting information, you're seeing fiction, not reality.

Unless it's incredibly weak encryption that can be brute-forced in short order, the only way a "hacker" might get access is to guess the passphrase that generated the key, which itself can be done via social engineering or brute force only for weak passwords.

Solid encryption with a strong password is unbreakable.

I was with him up until the rope and clock thing. Then he went hyperdrive on my ass .

Yeah everything's groovy except for the fact that Alice and Bob should be higher mathematicians =D

I was going to say this was real easy to understand, but that was before it started getting numerical. Really informative video regardless, enjoyed watch.

The title is wrong. It should say something like Public Key Cryptography.
Here is a more fun explanation:
https://www.youtube.com/watch?v=_f-5aJcRNrU&feature=related

I think he failed to explain the "mod" function well enough so that it's easier to understand.
"46 mod 12" simply means the REMAINDER of the 46/12 operation, if you take how many times 12 (as a whole) goes into 46. It's three times (36) with 10 remaining.


It's much easier to understand with 10:
"<any number> mod 10" gives you a single digit, the last digit of the original number. This is the remainder of a division by 10.
"46 mod 10" = 6, because 10 goes into 46 four times, with 6 as the remainder.



An interesting example is a "x mod 2" operation.
"<any number> mod 2" results in either 1 or 0.
If it's even, the remainder will be zero, otherwise 1, hence determining whether the number is odd or even

46 mod 2 is 0 because 2 goes into 46 23 times without any remainder.
47 mod 2 is 1 because 2 goes into 47 23 times with a 1 remainder.

The result is always either 1 or 0 and one can quickly check a number's parity with a simple "mod 2" operation :p

Why the sign''='' has 3 lines? Is it some sort more equal then equal ?

#14 that is a special equality for congruence relation.
http://en.wikipedia.org/wiki/Congruence_relation

#12 well, not really, it has something to do with PKI but in this case it's just about exchanging a secret key (diffie-hellman)...

#2 this is why computer scientists get paid many times more than you to work on computer algorithms. Most people have your same mentality, yet enjoy online banking/facebook/private ims/non-public email.

ok, i've wrapped my rope round the clock, cut it to a random length and found my number. now what? do i send the rope to my mate or the clock or the number? oh hang it, i'll see him at work tomorrow and just tell him.