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Crypto 101 – Introductory course on cryptography

crypto101.io

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Re: Crypto 101 – Introductory course on cryptography

#21

Post by okbake »

nemild wrote: post #11
kanzure wrote: post #7

Also here is is a Dan Boneh cryptography playlist https://www.youtube.com/playlist?list=PL9oqNDMzcMClAPkwrn5dm...

And as context, Professor Dan Boneh teaches the main introductory crypto class at Stanford (CS255) - it's a great intro for someone with some good CS fundamentals. The course syllabus is here: http://crypto.stanford.edu/~dabo/cs255/syllabus.html (Disclosure, I took the class a few years ago)

This is a great course. I also took it a few years ago and have been waiting for his Crypto 2 course since then. It seems like it's always "Coming Soon Fall 201x" though.

Re: Crypto 101 – Introductory course on cryptography

#26

Post by gmluke »

stcredzero wrote: post #12

When I was taking Aikido, there was a day when the sensei was going through all of our techniques and showed how the uke (initiator of the attack, receiver of the technique) could turn things around on the tori . (receiver of the attack, initiator of the technique) It seemed like there were a half dozen ways each that a technique could go seriously wrong, and that many of them didn't require much skill, only determin…

This is slightly tangential since you specified a conspirator on the inside, but how easy is it to break a homegrown encryption algorithm if you don't have the source code? I assume there are tools (what are they?) that will break a simple caesar cipher if you have more than a sentence or so of plain text to work with. But if you strung together 2-3 broken algorithms and your attacker doesn't know which ones, is it still trivial to decrypt?

Re: Crypto 101 – Introductory course on cryptography

#27

Post by andrewflnr »

stcredzero wrote: post #12

When I was taking Aikido, there was a day when the sensei was going through all of our techniques and showed how the uke (initiator of the attack, receiver of the technique) could turn things around on the tori . (receiver of the attack, initiator of the technique) It seemed like there were a half dozen ways each that a technique could go seriously wrong, and that many of them didn't require much skill, only determin…

Aikido in particular seems to be very subtle, both in my experience and the opinion of an aikido black belt I've asked about it. If you restrict yourself to aikido techniques and your attacker has no such reservations, you have to be extremely good. I think it would be a mistake to give up on self-defense in general because of that. In any case, you have to go into it knowing it's not a guarantee, it just increases your odds.

Re: Crypto 101 – Introductory course on cryptography

#28

Post by [deleted] »

stcredzero wrote: post #12

When I was taking Aikido, there was a day when the sensei was going through all of our techniques and showed how the uke (initiator of the attack, receiver of the technique) could turn things around on the tori . (receiver of the attack, initiator of the technique) It seemed like there were a half dozen ways each that a technique could go seriously wrong, and that many of them didn't require much skill, only determin…

[deleted]

Re: Crypto 101 – Introductory course on cryptography

#29

Post by reitanqild »

gmluke wrote: post #26
stcredzero wrote: post #12

When I was taking Aikido, there was a day when the sensei was going through all of our techniques and showed how the uke (initiator of the attack, receiver of the technique) could turn things around on the tori . (receiver of the attack, initiator of the technique) It seemed like there were a half dozen ways each that a technique could go seriously wrong, and that many of them didn't require much skill, only determin…

This is slightly tangential since you specified a conspirator on the inside, but how easy is it to break a homegrown encryption algorithm if you don't have the source code? I assume there are tools (what are they?) that will break a simple caesar cipher if you have more than a sentence or so of plain text to work with. But if you strung together 2-3 broken algorithms and your attacker doesn't know which ones, is it s…

Also interested.

Is there a general way to attack naive ciphers?

I fall of at even a proper Vigenère cipher, although I guess I could hack together a terribly inefficient python script to test all options and then print them line by line and start visually scanning for patterns :-/

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