# Difference between revisions of "SHA-1"

## 1 General Description

SHA-1 is an iterated hash function.

### 1.1 Compression Function

The compression function takes as input a 512-bit message block and a 160-bit chaining variable, and produces a 160-bit chaining value. The compression function is described as follows:

### 1.3 Initial Value and Constants

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## 3 Security Anaylsis

• Best know attack: $2^{63}$ by Wang et.al.
• Best known collision example: 64-step collision by De Canniere and Rechberger

something like: best know attack to date: kind of attack, which variant has been looked at (e.g. round-reduced), complexity, and reference to paper and abstract.

may be make here a new page with the other cryptanalysis results.