# What encryption algorithm is commutative

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Hi,

I heard some encryption algorithms are commutative. For example, if there
are two keys e_s and e_r,
then E(e_s, E(e_r, P)) = E(e_r, E(e_s, P)). Could you tell me what
encryption algorithms are commutative?

Thanks,

Xiaoxin

## Re: What encryption algorithm is commutative

alt.school.homework-help ?

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Elvis Notargiacomo  master AT barefaced DOT cheek
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My energy-saving light bulb caught fire.  Now I know
the NSA are beaming microwaves at my flat.

## Re: What encryption algorithm is commutative

Could tell me where I can find relevant documents?

Thanks

## Re: What encryption algorithm is commutative

http://www.rot13.com/info.php

ROTn commutes: consider rot(3, (rot(10, P))) ...
strength you can get by repeated applications of this.

and not this one on SSH.

--
Elvis Notargiacomo  master AT barefaced DOT cheek
http://www.notatla.org.uk/goen /
My energy-saving light bulb caught fire.  Now I know
the NSA are beaming microwaves at my flat.

## Re: What encryption algorithm is commutative

At the other end of a Google search?  You could even try the old fashioned
way and look in a library under the "Cryptography" section.

BTW when is the homework due?

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Darren Tucker (dtucker at zip.com.au)
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Good judgement comes with experience. Unfortunately, the experience