Avalanche effect

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This article is about cryptography; for other meanings, see snowball effect and avalanche (disambiguation).

In cryptography, the avalanche effect refers to a desirable property of cryptographic algorithms, typically block ciphers and cryptographic hash functions. The avalanche effect is evident if, when an input is changed slightly (for example, flipping a single bit) the output changes significantly (eg, half the output bits flip). In the case of quality block ciphers, such a small change in either the key or the plaintext should cause a drastic change in the ciphertext. The actual term was first used by Horst Feistel, although the concept dates back to at least Shannon's diffusion.

If a block cipher or cryptographic hash function does not exhibit the avalanche effect to a significant degree, then it has poor randomization, and thus a cryptanalyst can make predictions about the input given only the output. This may be sufficient to partially or completely break the algorithm. It is thus not a desirable condition — at least from one point of view.

Constructing a cipher or hash to exhibit a substantial avalanche effect is one of the primary design objectives. This is why most block ciphers are product ciphers. It is also why hash functions have large data blocks. Both these features allow small changes to propagate rapidly through iterations of the algorithm, such that every bit of the output should depend on every bit of the input before the algorithm terminates.

1 Strict avalanche criterion
- 1.1 Definition
2 Bit independence criterion
3 See also
4 References

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Strict avalanche criterion

The Strict Avalanche Criterion (SAC) is a property of boolean functions of relevance in cryptography. The SAC builds on the concepts of completeness and avalanche and was introduced by Webster and Tavares in 1985.

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Definition

A function is said to satisfy the strict avalanche criterion if, whenever a single input bit is complemented, each of the output bits should change with a probability of one half.

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Bit independence criterion

The Bit independence criterion (BIC) states that output bits j & k should change independently when any single input bit i is inverted, for all i, j and k.

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