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- W47893825 abstract "In this paper we define a notion of leak extraction from a block cipher. We demonstrate this new concept on an example of AES. A result is LEX: a simple AES-based stream cipher which is at least 2.5 times faster than AES both in software and in hardware. In this paper we suggest a simple notion of a leak extraction from a block cipher. The idea is to extract parts of the internal state at certain rounds and give them as the output key stream (possibly after passing an additional filter function). This idea applies to any block cipher but a careful study by cryptanalyst is required in each particular case in order to decide which parts of the internal state may be given as output and at what frequency. This mainly depends on the strength of the cipher's round function and on the strength of the cipher's key-schedule. For example, ciphers with good diffusion might allow to output larger parts of the internal state at each round than ciphers with weak diffusion. In this paper we describe our idea on an example of 128/192/256 bit key AES. Similar approach may be applied to the other block-ciphers, for exam- ple to Serpent. Interesting lessons learnt from LEX so far are that: LEX setup and resynchronization which are just a single AES key-setup and a single AES encryption are much faster than for most of the other stream ciphers (see per- formance evaluation of eSTREAM candidates (8)). This is due to the fact that many stream ciphers aimed at fast encryption speed have a huge state which takes very long time to initialize. Also, the state of the stream ciphers has to be at least double of the keysize in order to avoid tradeoff attacks, but on the other hand it does not have to be more than that. Moreover unlike in a typical stream cipher, where all state changes with time, in LEX as much as half of the state does not need to be changed or may evolve only very slowly." @default.
- W47893825 created "2016-06-24" @default.
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- W47893825 date "2007-01-01" @default.
- W47893825 modified "2023-09-24" @default.
- W47893825 title "Block and Stream Ciphers and the Creatures in Between" @default.
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