SHA1 Checksum Calculator
About SHA1 Hash
SHA1 (Secure Hash Algorithm 1) is a cryptographic hash function that produces a 160-bit (40-character) hash value. While it was once widely used for security purposes, it is now considered cryptographically broken due to collision vulnerabilities. However, it remains useful for non-security-critical applications like checksums and data integrity verification.
Common Use Cases
File Integrity Verification
Used to verify file integrity and detect accidental corruption during file transfers or downloads.
Digital Signatures
Still used in some legacy systems for basic digital signatures and certificate verification.
Version Control Systems
Git and other version control systems use SHA1 for identifying commits and tracking changes.
Frequently Asked Questions
Is SHA1 still secure?
No, SHA1 is not considered cryptographically secure for security-sensitive applications. It is vulnerable to collision attacks, where two different inputs can produce the same hash. For security-critical applications, use SHA-256 or SHA-3 instead.
What's the difference between SHA1 and MD5?
SHA1 produces a 160-bit hash (40 characters) while MD5 produces a 128-bit hash (32 characters). SHA1 is generally considered more secure than MD5, though both are now cryptographically broken.
When should I use SHA1?
SHA1 is still suitable for non-security-critical applications like:
- File integrity verification
- Basic checksums
- Legacy system compatibility
- Version control systems
How to Use
- Enter text in the input field or upload any file
- The SHA1 hash will be generated automatically in two formats:
- Hex format: Standard 40-character hexadecimal representation
- Base64 format: The same checksum encoded in Base64
- Click the copy button next to either format to copy the hash to your clipboard
- Use the hash for data integrity verification