SipHash Generator

Generate SipHash cryptographic hashes with our secure online tool. SipHash is optimized for short inputs and provides protection against hash-flooding attacks.

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Key-Based Hashing

Secure hashing with customizable keys for added security

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Fast & Efficient

Optimized for performance with short inputs and messages

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DoS Protection

Designed to prevent hash-flooding denial-of-service attacks

🔒 Client-Side Processing
All hashing is done in your browser using JavaScript. Your data and keys never leave your device, ensuring maximum privacy and security.

Text Input

File Upload

Enter text to hash

Upload a file to hash

SipHash Key (16-byte hex string, optional)

SipHash Version

Your SipHash will appear here...

💡 For developers: SipHash usage examples:

// Python

import siphash

key = b'0123456789ABCDEF' # 16 bytes

hash = siphash.SipHash_2_4(key, b'message').hash()

// JavaScript (Node.js)

const siphash = require('siphash24');

const key = Buffer.from('0123456789ABCDEF0123456789ABCDEF', 'hex');

const hash = siphash(Buffer.from('message'), key);

// Rust

use siphash::{SipHasher24, SipHasher};

let key: [u8; 16] = [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15];

let mut hasher = SipHasher24::new_with_key(&key);

hasher.write(b"message");

let hash = hasher.finish();

About SipHash Algorithm

SipHash is a family of pseudorandom functions (PRFs) optimized for speed on short inputs. It was designed by Jean-Philippe Aumasson and Daniel J. Bernstein in 2012 as a secure alternative to non-cryptographic hash functions when protection against hash-flooding attacks is required.

SipHash Characteristics

• Keyed hash function: Requires a 128-bit key
• 64-bit output size (16 hex characters)
• Optimized for short messages (typically under 128 bytes)
• Configurable compression rounds (c) and finalization rounds (d)
• Designed to be secure against hash-flooding DoS attacks

✅ Security Status: SipHash is considered cryptographically secure for its intended purposes. It provides strong protection against collision attacks and hash-flooding DoS attacks when used with a secret key.

Common Uses of SipHash

SipHash is widely used in software and systems where protection against hash-flooding attacks is crucial:

Application	Usage
Python	Hash tables for strings and other objects
Ruby	Hash function for hash tables since version 2.1
Rust	Default hasher for HashMap and HashSet
SystemD	Journal file hashing and other internal uses

SipHash Variants Comparison

Variant	Compression Rounds (c)	Finalization Rounds (d)	Security/Speed
SipHash-1-3	1	3	Fastest, reduced security
SipHash-2-4	2	4	Recommended balance
SipHash-4-8	4	8	Highest security, slower

SipHash vs Other Hash Algorithms

Algorithm	Output Size	Keyed	Primary Use
SipHash	64 bits	Yes	Hash tables, DoS protection
MD5	128 bits	No	Checksums (broken for security)
SHA-256	256 bits	No	Cryptography, certificates
HMAC-SHA256	256 bits	Yes	Message authentication

💡 Important: For SipHash to provide security benefits, the key must be kept secret. When using SipHash in hash tables, generate a random key at application startup and keep it confidential.