It starts by first creating a hash of a message with MD5 and then uses a secret key to complete another calculation on the hash.
However, HMAC also uses a shared secret key to add some randomness to the result and only the sender and receiver know the secret key.Īs an example, imagine that one server is sending a message to another server using HMAC- MD5. An HMAC is a fixed-length string of bits similar to other hashing algorithms such as MD5 and SHA-1 (known as HMAC-MD5 and HMAC-SHA1).
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It can create hashes of the same size as SHA-2 (224 bits, 256 bits, 384 bits, and 512 bits).Īnother method used to provide integrity is with a Hash-based Message Authentication Code (HMAC). SHA-3 was created outside of the NSA and was selected in a non-NSA public competition. National Security Agency (NSA) created SHA-1 and SHA-2. SHA-3 (previously known as Keccak) is an alternative to SHA-2.SHA-224 (224-bit hashes) and SHA-384 (384-bit hashes) create truncated versions of SHA-256 and SHA- 512, respectively. SHA-256 creates 256-bit hashes and SHA-512 creates 512-bit hashes.
SHA-2 improved SHA-1 to overcome potential weaknesses.This is similar to the MD5 hash except that it creates 160-bit hashes instead of 128-bit hashes. SHA-1 is an updated version that creates 160-bit hashes.There are several variations of SHA grouped into four families-SHA-0, SHA-1, SHA-2, and SHA-3: Secure Hash Algorithm (SHA) is another hashing algorithm. Hexadecimal characters are composed of 4 bits and use the numbers 0 through 9 and the characters a through f. For example, an MD5 hash is displayed as 32 hexadecimal characters instead of 128 bits. Hashes are commonly shown in hexadecimal format instead of a stream of 1s and 0s. Message Digest 5 (MD5) is a common hashing algorithm that produces a 128-bithash. Get Quality Security+ 501 Practice Test Questions Here
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