SHA256: Difference between revisions
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SHA-2 (Secure Hash Algorithm 2) is a set of cryptographic hash functions designed by the United States National Security Agency (NSA) and first published in 2001.<ref>https://en.wikipedia.org/wiki/SHA-2</ref> | SHA-2 (Secure Hash Algorithm 2) is a set of cryptographic hash functions designed by the United States National Security Agency (NSA) and first published in 2001.<ref>https://en.wikipedia.org/wiki/SHA-2</ref> | ||
SHA256 is complex. Watch this video for an appreciation: | |||
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<iframe width="560" height="315" src="https://www.youtube.com/embed/S9JGmA5_unY" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe> | |||
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Even a small change in the message will (with overwhelming probability) result in a mostly different hash, due to the avalanche effect. For example, adding a period to the end of the following sentence changes almost half (111 out of 224) of the bits in the hash: | Even a small change in the message will (with overwhelming probability) result in a mostly different hash, due to the avalanche effect. For example, adding a period to the end of the following sentence changes almost half (111 out of 224) of the bits in the hash: | ||
Revision as of 17:34, 8 March 2020
Advanced programming[1]
SHA-2 (Secure Hash Algorithm 2) is a set of cryptographic hash functions designed by the United States National Security Agency (NSA) and first published in 2001.[2]
SHA256 is complex. Watch this video for an appreciation:
Even a small change in the message will (with overwhelming probability) result in a mostly different hash, due to the avalanche effect. For example, adding a period to the end of the following sentence changes almost half (111 out of 224) of the bits in the hash:
SHA224("The quick brown fox jumps over the lazy dog")
0x 730e109bd7a8a32b1cb9d9a09aa2325d2430587ddbc0c38bad911525
SHA224("The quick brown fox jumps over the lazy dog.")
0x 619cba8e8e05826e9b8c519c0a5c68f4fb653e8a3d8aa04bb2c8cd4c