Databases
StackOverflow2013
Postsdbo
PO
Body
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    text
    copied!<p>The Secure Hash Algorithm (SHA) algorithm takes a message of less than 264 bits in length and produces a 160-bit message digest. The algorithm is slightly slower than MD5, but the larger message digest makes it more secure against brute-force collision and inversion attacks. The algorithm specified in the Secure Hash Standard (SHS, FIPS 180), was developed by NIST. SHA-1 is a revision to SHA that was published in 1994; the revision corrected an unpublished flaw in SHA. Its design is very similar to the MD4 family of hash functions developed by Rivest. SHA-1 is also described in the ANSI X9.30 standard.</p> <p>RSA is an algorithm for public-key cryptography. It is the first algorithm known to be suitable for signing as well as encryption, and one of the first great advances in public key cryptography. RSA is widely used in electronic commerce protocols, and is believed to be secure given sufficiently long keys and the use of up-to-date implementations.</p> <p><strong>The most notable difference is that SHA is an encryption algorithm whereas RSA is both an encryption as well as signing algorithm.</strong></p> <p>On 8/16/2005 it was announced that it is possible to find a collision in SHA-1 in 2^63 operations. This research result is due to Professor Xiaoyun Wang of Tsinghua University in Beijing, together with Professors Andrew Yao and Frances Yao. It extends the work of Wang, Yin, and Yu, which demonstrated that a collision could be found in 2^69 operations. What that means is that it is easier for a collision to occur in SHA than in RSA - but notably, no two similar keys have ever been found that collided.</p>
 

Querying!

 
Guidance
An individual column

Larger individual text columns get their own page to allow for proper reading.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload