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Mar
17
comment Can a file be maliciously changed in a way that maintains its original SHA-1 Hash?
The question is about second-preimage attacks, but your answer is about collisions. Preimage attacks against SHA-1 — and even MD5 — are absurdly impractical. (There's a 2^123 preimage attack against MD5, but with SHA-1 you're stuck with a 2^160 brute-force.)
Dec
8
answered What is the value of MD5 checksums if the MD5 hash itself could potentially also have been manipulated?
Dec
8
comment What is the value of MD5 checksums if the MD5 hash itself could potentially also have been manipulated?
@BigChris I'm not sure what you mean, but it sounds wrong. Cryptographic hash algorithms like MD5 are completely about the message data. Two random messages of the same length will almost certainly have different hashes.
Sep
19
comment Is it safe to download and burn a disc image on an infected PC?
@Zoredache It's easy to create two files with the same MD5 hash. However, there are no known feasible first- or second-preimage attacks against MD5 -- there is no known way to create a new file that matches the hash of an existing file.
May
26
comment How to whois new TLDs?
IANA's Root Zone Database includes whois servers, along with other information for TLDs. (It's near the bottom of a TLD's entry.)
May
24
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Jan
10
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Jan
10
answered Detecting source of memory usage on a Linux box