Use this generator to easily calculate the SHA-256 hash of a given string. Generate SHA-256 checksums.
What is SHA-256?
The above SHA-256 generator allows you to easily compute hashes and checksums, but what are they exactly? SHA256 is a part of the SHA-2 (Secure Hash Algorithm 2) family of one-way cryptographic functions, developed in 2001 by the United States National Security Agency (NSA). Hashing functions are cryptographic devices that take as input any string of characters or a file of any type, and then output a computed collision-resistant hash. Collision resistance means that nobody should be able to find two different inputs that produce the same hash.
Below are some examples of SHA256 hashes from different strings, all with a length of 256 bits (spread over several lines to prevent horizontal scrolling).
|The quick brown fox jumps over the lazy dog||d7a8fbb307d7809469ca9a
|The quick brown fox jumps over tha lazy dog||77125ec2f977a62aaca3bf
The above table was produced using our SHA-256 generator.
There are two documents by the IETF that describe how the message digest should be computed: RFC 4634: "US Secure Hash Algorithms (SHA and HMAC-SHA)" released in 2006, which was replaced in 2011 by RFC 6234 "US Secure Hash Algorithms (SHA and SHA-based HMAC and HKDF)".
Practical Usage of the SHA256 algorithm
SHA-256 is implemented in widely used security applications like TLS, PGP, SSH, IPsec, DKIM, in Unix/Linux systems for password hashing, and others. It is required by law for use in certain government agency applications and is coming in place of the older SHA-1, which is no longer considered secure and deprecated in many widely used applications, including web browsers.
SHA256 functions are available in many programming languages such as PHP, Java, Python, and libraries for them, and used for developing secure apps. When passwords are stored, they are usually salted to prevent an attacker from cracking the passwords of many users who happen to have chosen the same password, at once.
Finally, SHA-256 plays a role in the currently popular Bitcoin network for mining and the creation of Bitcoin addresses. In mining, it is the function used as proof of work. Bitcoin addresses are hashed public keys, which have the advantage of shortness (making them more convenient) and added security.
Cite this calculator & page
If you'd like to cite this online calculator resource and information as provided on the page, you can use the following citation:
Georgiev G.Z., "SHA256 Online Generator", [online] Available at: https://www.gigacalculator.com/calculators/sha256-online-generator.php URL [Accessed Date: 24 Mar, 2019].