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Compare cryptographic hashes securely with timing-safe comparison. Verify hash integrity, compare multiple algorithms, and validate hash formats with advanced security features.
Hash comparison is the process of verifying whether two hash values are identical. This is crucial for data integrity verification, password validation, file authentication, and security auditing.
Regular string comparison can leak information through timing attacks. Timing-safe comparison takes constant time regardless of where differences occur.
Verify downloaded software matches the official hash to ensure it hasn't been tampered with or corrupted during download.
Compare user-provided password hash with stored hash to authenticate users without storing actual passwords.
Ensure legal documents, contracts, or records haven't been modified by comparing their hash values.
Verify blockchain transactions and blocks by comparing computed hashes with stored values.
Check if database records have been modified by comparing current hash with baseline hash.
Find duplicate files or content by comparing their hash values instead of byte-by-byte comparison.
A timing attack exploits the time it takes to compare two values. If comparison stops at the first mismatch, an attacker can measure response times to guess the correct value character by character.
Problem: Takes longer when more characters match. Attacker can measure timing to guess correct values.
Solution: Takes constant time regardless of where differences occur. Prevents timing attacks.
Generate MD5, SHA-256, SHA-512 hashes from text or files
Create secure salted hashes for password storage
Calculate and verify file checksums for integrity
Encode and decode Base64 strings securely
Decode and verify JSON Web Tokens
Generate strong, secure random passwords
| Algorithm | Length | Example | Pattern |
|---|---|---|---|
| MD5 | 32 hex chars | 5d41402abc4b2a76b9719d911017c592 | [0-9a-f]{32} |
| SHA-1 | 40 hex chars | aaf4c61ddcc5e8a2dabede0f3b482cd9aea9434d | [0-9a-f]{40} |
| SHA-256 | 64 hex chars | 2c26b46b68ffc68ff99b453c1d30413413422d706... | [0-9a-f]{64} |
| SHA-512 | 128 hex chars | f7fbba6e0636f890e56fbbf3283e524c6fa3204ae... | [0-9a-f]{128} |
Timing-safe comparison prevents timing attacks where attackers measure how long it takes to compare values. This is critical for password verification, API tokens, and cryptographic signatures where leaked timing information could help attackers guess correct values. Regular string comparison stops at the first mismatch, taking different amounts of time based on where differences occur, while timing-safe comparison always takes constant time.
No. Hashes from different algorithms (e.g., MD5 vs SHA-256) will never match even for the same input because they produce different output lengths and use different mathematical operations. MD5 produces 32 hex characters, SHA-256 produces 64, and SHA-512 produces 128. Always compare hashes from the same algorithm.
Hash values are typically represented in hexadecimal, which can be uppercase or lowercase. Our tool performs case-insensitive comparison by default, so "ABC123" and "abc123" are considered identical. However, the actual hash bytes are the same regardless of case representation.
If hashes don't match, it means: 1) The input data is different, 2) Different algorithms were used, 3) One hash is corrupted or incorrect, or 4) The data has been modified. Even a single bit difference in input produces completely different hashes due to the avalanche effect in cryptographic hash functions.
Yes! Our tool supports batch comparison where you can paste multiple hash pairs and compare them all at once. This is useful for verifying multiple files, validating large datasets, or checking software package integrity across multiple downloads.
Yes. All comparisons are performed client-side in your browser using JavaScript. No data is sent to any server. However, remember that hashes themselves don't contain the original data, so comparing hashes is generally safe even for sensitive information. The tool uses timing-safe comparison algorithms to prevent timing attacks.