What is SHA-512?
SHA-512 is a message-digest algorithm. It's used to compute a
hash value in cryptography. So what's an hash function then?
Simply put, a hash function takes a block of data and returns a
fixed-size bit string (hash value). The data used by hash
functions is referred to as a "message", while the computed hash
value is referred to as the "message digest".
When to use SHA-512?
SHA-512, like other hash functions, is used in digital
signatures, message authentication codes, to index data in hash
tables, for finger-printing, to detect duplicate data, uniquely
identify files, and as checksums to detect accidental data
How big is a SHA-512 hash value?
SHA-512 produces a 512-bit (64 bytes) hash value. It's usually
represented as a hexadecimal number of 128 digits.
How can I decrypt SHA-512?
You can't! SHA-512 is NOT an encryption algorithm! A lot of
people are under the impression that SHA-512 encrypts data. It
does no such thing. All it does is compute a hash value for a
given set of data.
How do I reverse SHA-512?
You can't! SHA-512 is NOT reversible. Hash functions are used
as one-way methods. They take the data (messages) and compute
hash values (digests). The inverse can't be done.
To better explain why a SHA-512 is NOT reversible, here's very
Using SHA-512 on text data of 750,000 characters, we obtain a
mere 128 digits digest. Now if I wanted to revert this, how could
I possibly determine with exactitude which 750,000 characters
were used from just 128 digits?!? This would be the BEST
compression algorithm in the world