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- How to verify the checksum of a downloaded file (pgp, sha, etc. )?
A checksum simply verifies with a high degree of confidence that there was no corruption causing a copied file to differ from the original (for varying definitions of "high") In general a checksum provides no guarantee that intentional modifications weren't made, and in many cases it is trivial to change the file while still having the same
- authentication - Is signing a file better than issuing a checksum, and . . .
You are correctly though that, if a machine is doing all the work, you probably don't need to have both a checksum and a signature, as the signature will perform the checksum for you However, as other commenters have mentioned, it can be useful to have a checksum if humans will be involved, as verifying a sha256sum is typically a lot easier
- Whats to stop someone from just MITMing a checksum?
Checksum solves the problem of integrity, you know that what you just downloaded is correct, but you do not know from who it comes If someone is operating a MitM attack, they obviously will try to replace the checksum of whatever download you required with the checksum of the binary they want you to have instead
- What is the difference between the sig files and the checksum files . . .
The file's fingerprint (checksum) is there to tell you that the file is not altered An attacker may host a malicious version of PuTTY on his website and makes it available to download Verifying the checksum in this case is useless: the only way for you to be sure that you did not download a malicious version of PuTYY is to check its signature(s)
- Which hashing algorithm shoud I use for a safe file checksum?
To protect the integrity of the work I have done and to guarantee it has never been modified, I intend to add a checksum to my documentation which will be provided with the file Since MD5 and SHA-1 are not secure for a long time now, I was wondering if we were still using them for this purpose or if there are better algorithms which could do
- Does a Files Checksum Change after it is Digitally Signed?
Since the signature is included in the file, it will change the checksum if you pass it through a regular hashing program like MD5SUM File Signing is format specific -- i e the way to check it for PDF is different from word etc But since the signature is always packaged into the file itself, it will change the checksum of the file –
- checksum简单校验和是如何计算的？ - 知乎
IP首部的checksum只计算IP首部的数据20个字节，每两个字节组成一个数，这当然比较好分配 然而像ICMP首部中的checksum计算的是首部和数据部分，有可能有奇数个字节，每2个字节组成一个数，最后还会剩下一个字节，这最后一个字节是简单地相加吗？
- Is a SHA checksum enough to verify integrity and authenticity?
The practice of releasing a checksum together with a file predates the widespread use of HTTPS Furthermore, the storage media you might copy your data to might be unreliable (think optical disks, etc ), and as such having a checksum already at hand that you can assume to be genuine is a good idea
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