# Chaining random permutations

*From*: Ertugrul Söylemez <es@xxxxxxxx>*Date*: Mon, 9 Feb 2009 17:20:48 +0100

Hello group,

Given a source for truely random numbers, you can construct a truely

random permutation for blocks of a small size, say 16 bits, by

enumeration. You can use cipher block chaining to apply this

permutation securely to larger blocks of plaintext. If your plaintext

is suitably small, such that the chaining doesn't start to leak

information, wouldn't that make a secure block cipher? I'm not asking

for perfect secrecy, just for reasonable security.

Greets,

Ertugrul.

--

nightmare = unsafePerformIO (getWrongWife >>= sex)

http://blog.ertes.de/

.

**Follow-Ups**:**Re: Chaining random permutations***From:*Thomas ***in

**Re: Chaining random permutations***From:*Kristian Gjøsteen

**Re: Chaining random permutations***From:*Unruh

**Re: Chaining random permutations***From:*Phil Carmody

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