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Researchers Warn Against Continuing Use Of SHA-1 Crypto Standard
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TejGandhi1986
TejGandhi1986,
 User Rank: Apprentice
10/9/2015 | 10:37:17 PM
SHA1 vulnerable
As computers evolve its becoming aier to break into aglorithms.It appears that upgrading the algorithm to SHA2 and SHA3 be the rigt way to go ahed.As quantum computers evolve it is just a  matter of time when algorithms like SHA2 and SHA 3 can also be broken.
SimhaluK693
SimhaluK693,
 User Rank: Apprentice
10/14/2015 | 3:56:45 PM
Re: SHA1 vulnerable
Timline
MD4
------
1990  by Ron Rivest based on Merkle Damgard

1991 Boer and Bosselaers - psuedo collisions
Same message with two different sets of initial values.
Linear attack on last 2 rounds.
1 millisecond on a 16 Mhz IBM PS/2

1996 Dobbertin - Semi freestart collisions.
Few seconds on a PC with Pentium processor.

1997 Dobbertin - Found preimages
Takes less than 1 hr on a PC.

2005 Wang - Full Collisions
Uses 2 blocks(1024 bits)
IBM P690 takes about 1 hour to find pair of first blocks.
Fastest cases take only 15 minutes.
15 seconds to 5 minutes to find the pair of second blocks.

SHA-0  
----------
1993 by NIST based on MD4
2004 Biham and Chen near-collision
2004 Joux - 4 block full collision - 2^ 51 hash ops
80,000 hours of CPU hrs on a supercomputer with 256 Itanium
2 processors.

2008 boomerang attack
2 ^ 33.6
Takes less than 1 hour of PC

MD5
--------
1991 Ron Rivest
128-bit hash value

1996 Dobbertin - Semi - FreeStart Collisions
2005 Wang - Full collisions

SHA-1
----------
1995  by NIST based on MD4
160-bit hash value

2005 Wang 2005  - Theoretical collision attack

2015 Stevens - Semi- Freestart collisions
All 80 steps
Takes 10 days using
16 * 4 GTX-970 GPUs, 1 Haswell i5-4460 processor and 16GB of RAM
----


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