Cryptographic Hashing Function (SHA-1 and MD5): Difference between revisions
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==SHA-1== | ==SHA-1== | ||
SHA-1 was designed by the Nation Security Agency (NSA) in 1995. | *SHA-1 was designed by the Nation Security Agency (NSA) in 1995. | ||
Published by The National Institute of Standards and Technology as a Federal Information Processing Standard for the US. | *Published by The National Institute of Standards and Technology as a Federal Information Processing Standard for the US. | ||
SHA-1 is an upgraded version of SHA-0, correcting an error is the hash specification. | *SHA-1 is an upgraded version of SHA-0, correcting an error is the hash specification. | ||
SHA-1 is the most used version of SHA today. It is currently used in many applications and security protocols. | *SHA-1 is the most used version of SHA today. It is currently used in many applications and security protocols. | ||
==MD5== | ==MD5== | ||
MD5 was developed by Ron Rivest in 1991 | *MD5 was developed by Ron Rivest in 1991 | ||
MD5 was published in 1992. | *MD5 was published in 1992. | ||
Its used in many security applications, and is great for checking file integrity. | *Its used in many security applications, and is great for checking file integrity. | ||
==History== | ==History== | ||
There are many versions of Message Digest (MD) Algorithm, including MD2, MD4, MD5, and as of 2008 MD6. | *There are many versions of Message Digest (MD) Algorithm, including MD2, MD4, MD5, and as of 2008 MD6. | ||
Secure Hashing Algorithm (SHA) started with SHA-0, and two years later moved onto SHA-1. The National Institute of Standards and Technology published SHA-2; which are broken into 4 different digest lengths - SHA-224 (224 bits), SHA-256 (256 bits), SHA-384 (384 bits) and SHA-512 (512 bits) | *Secure Hashing Algorithm (SHA) started with SHA-0, and two years later moved onto SHA-1. The National Institute of Standards and Technology published SHA-2; which are broken into 4 different digest lengths - SHA-224 (224 bits), SHA-256 (256 bits), SHA-384 (384 bits) and SHA-512 (512 bits) | ||
SHA-3 is currently being developed in a competition, currently in round 2 and will be moving on to round 3 soon. The winner will be announced in 2012. | *SHA-3 is currently being developed in a competition, currently in round 2 and will be moving on to round 3 soon. The winner will be announced in 2012. | ||
==Differences== | ==Differences== | ||
Revision as of 22:18, 8 December 2010
What is a Cryptographic Hash Function?
A crytographic hashing function is a deterministic procedure that takes a block of code and returns a fixed bit string.
Two widely used hasing functions used today are MD5 and SHA-1
SHA-1
- SHA-1 was designed by the Nation Security Agency (NSA) in 1995.
- Published by The National Institute of Standards and Technology as a Federal Information Processing Standard for the US.
- SHA-1 is an upgraded version of SHA-0, correcting an error is the hash specification.
- SHA-1 is the most used version of SHA today. It is currently used in many applications and security protocols.
MD5
- MD5 was developed by Ron Rivest in 1991
- MD5 was published in 1992.
- Its used in many security applications, and is great for checking file integrity.
History
- There are many versions of Message Digest (MD) Algorithm, including MD2, MD4, MD5, and as of 2008 MD6.
- Secure Hashing Algorithm (SHA) started with SHA-0, and two years later moved onto SHA-1. The National Institute of Standards and Technology published SHA-2; which are broken into 4 different digest lengths - SHA-224 (224 bits), SHA-256 (256 bits), SHA-384 (384 bits) and SHA-512 (512 bits)
- SHA-3 is currently being developed in a competition, currently in round 2 and will be moving on to round 3 soon. The winner will be announced in 2012.
Differences
- MD5 uses 128 bit digests, while SHA-1 has 160 bit digests.
- That being said, SHA-1 has 4 billion times more output space than MD5.
- MD5 is less secure than SHA-1, but processes faster.
- MD5 is heavily used in software to check file integrity (Md5sum) and is commonly used to store passwords.
- SHA-1 and SHA-2 and required by law for some US Goverment applications.