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Re^4: What A Wonderful World: Bitmasks!

by ikegami (Pope)
on Jun 22, 2005 at 05:12 UTC ( #468910=note: print w/replies, xml ) Need Help??

in reply to Re: Re: Re: What A Wonderful World: Bitmasks!
in thread What A Wonderful World: Bitmasks!

I think XOR is still at the base of modern symetric (i.e. private key) encryption algorithms. They create a stream which is XORed with the plaintext. The difference between the simple XOR encryption of which you are surely thinking and these better algorithm is that the stream these new algorithms create is not periodic.

If I remember correctly, one end of an HTTPS connection uses public key encryption to distribute a private key to its peer, and then they switch to symetric (private key) encryption. It does this because symetric is faster, and XOR surely plays a part in that.

Feel free to correct me. This subject is far from fresh in my mind.

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[Corion]: ambrus: Well, for mathematical notation, I find blackboard much more convenient than a computer. But when inserting text or moving text around, the computer wins obviously
[ambrus]: But either of these is a big problem in practice, so I'd need to spend like thirty years of my life to solve (a) and five more years to solve (b)
[ambrus]: Corion: yes, CURRENTLY the blackboard is more convenient
[ambrus]: and it's not like I want to ban blackboards anyway
[ambrus]: you already have blackboards and a canvas for projector or overhead transparencies (or positive film slide projector, not used for maths) canvas in the same lecture halls today, and switch in a few minutes between presentations,
[ambrus]: they're only difficult to use together.
[ambrus]: overhead transparencies are a nice convenience by the way that mix the two slides, because you can write them in advance and edit them during the presentation easily. but they're not very much in fasion these days.
[ambrus]: you can even print them.
[Discipulus]: ambrus i'm trying out MremoteNG which wrap putty and rdp and many other things..
[Corion]: ambrus: Yes, ideally you would have the ease of overhead projection transparencies and pens drawing on them, combined with the computer generated slide text...

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