SHA1 Hash Generator

This online tool will take a string and hash it using the SHA-1 algorithm. This is a quick way to verify that the hash you are working with is correct. Make sure to include salt in the string if you are using it.


SHA-1 is a cryptographic hash function that creates a 40 byte hash value for an input. It is one-way, meaning that the original input cannot be determined from the hash value. SHA-1 is collision resistant, meaning that two different inputs cannot have the same hash value.

SHA-1 is a hash function which takes an input and produces a 160-bit hash value known as a message digest. It was designed by the United States National Security Agency, and is a U.S. Federal Information Processing Standard.

As of 2005, SHA-1 is no longer considered secure against well-funded opponents. Many organizations have recommended its replacement as of 2010. NIST formally deprecated the use of SHA-1 in 2011 and disallowed its use for digital signatures in 2013. As of 2020, chosen-prefix attacks against SHA-1 are practical. As such, it is recommended to remove SHA-1 from products as soon as possible and instead use SHA-2 or SHA-3. Replacing SHA-1 is especially urgent where it is used for digital signatures.

As of 2017, all major web browser vendors have stopped accepting SHA-1 SSL certificates. In February 2017, CWI Amsterdam and Google announced that they had successfully performed a collision attack against SHA-1 by creating two dissimilar PDF files that resulted in the same SHA-1 hash. However, SHA-1 is still considered to be secure for HMAC purposes.

Microsoft is no longer supporting SHA-1 code signing for Windows Update as of August 7, 2020.

SHA-1 creates a message digest that is similar to the MD2, MD4, and MD5 message digest algorithms designed by Ronald L. Rivest of MIT. However, SHA-1 generates a larger hash value (160 bits vs. 128 bits).

SHA-1 is a hashing algorithm that was developed as part of the U.S. Government's Capstone project. The algorithm was first published in 1993 in the Secure Hash Standard, FIPS PUB 180, by the U.S. National Institute of Standards and Technology. The SHA-0 algorithm was published in 1993 and was later withdrawn by the NSA. A revised version, SHA-1, was published in 1995. SHA-1 is different from SHA-0 only in the way that its compression function's message schedule is rotated by a single bit. The NSA says that this was done to fix a security flaw in the original algorithm, but they didn't explain any further. Publicly available techniques showed that SHA-0 could be compromised in 2004, before SHA-1 was compromised in 2017.

Online tool to generate random hash data. The generated data can be used to crack passwords and encryption keys. The tool can generate random hash data using multiple algorithms.