Is SHA-1 still secure for modern applications?

No. Since the successful SHAttered collision attack in 2017, SHA-1 is deprecated for digital signatures, SSL certificates, and security-critical systems.

Why does Git use SHA-1?

Git operates as a content-addressable storage system using hashes to verify integrity. While SHA-1 was the original choice, Git has actively incorporated SHA-256 support.

What is the key difference between SHA-1 and MD5?

SHA-1 generates a 160-bit (40-hex) output, while MD5 produces a 128-bit (32-hex) output. SHA-1 offers higher collision resistance than MD5, but both are deprecated for cryptographic security.

SHA-1 Hash

Try the free SHA-1 Hash tool in the Hash category provided by WebToolBox right in your browser. Process your tasks quickly and securely without any installation.

Input

Output

What is SHA-1 Hash?

SHA-1 (Secure Hash Algorithm 1) is a cryptographic hash function published by NIST in 1995 as a U.S. Federal Information Processing Standard (FIPS PUB 180-1). It transforms input data into a 160-bit (40-character hexadecimal) hash digest.

SHA-1 was widely deployed across SSL/TLS certificates, software distribution, and version control systems. Notably, Git historically relied on SHA-1 hashes to uniquely identify commits and tree objects.

In 2017, Google and CWI Amsterdam produced the first practical collision attack (SHAttered), proving that two different PDF documents could produce the identical SHA-1 hash. Consequently, modern security standards mandate upgrading to SHA-256 or SHA-512.

How to Use

Type or paste your data into the input box.
The 160-bit SHA-1 hash is computed automatically as you type.
Click the 'Copy' button to transfer the hash digest to your clipboard.
Click 'Sample' to load sample text instantly.

FAQ

Is SHA-1 still secure for modern applications?: No. Since the successful SHAttered collision attack in 2017, SHA-1 is deprecated for digital signatures, SSL certificates, and security-critical systems.
Why does Git use SHA-1?: Git operates as a content-addressable storage system using hashes to verify integrity. While SHA-1 was the original choice, Git has actively incorporated SHA-256 support.
What is the key difference between SHA-1 and MD5?: SHA-1 generates a 160-bit (40-hex) output, while MD5 produces a 128-bit (32-hex) output. SHA-1 offers higher collision resistance than MD5, but both are deprecated for cryptographic security.

Hash — Tool Navigation

MD5 Hash

Try the free MD5 Hash tool in the Hash category provided by WebToolBox right in your browser. Process your tasks quickly and securely without any installation.

SHA-256 Hash

Try the free SHA-256 Hash tool in the Hash category provided by WebToolBox right in your browser. Process your tasks quickly and securely without any installation.

SHA-384 Hash

Try the free SHA-384 Hash tool in the Hash category provided by WebToolBox right in your browser. Process your tasks quickly and securely without any installation.

SHA-512 Hash

Try the free SHA-512 Hash tool in the Hash category provided by WebToolBox right in your browser. Process your tasks quickly and securely without any installation.