How to sha checksum mac
If I ever want to add more data for that subject, I can readily work out their hash key again, but I cannot browse the database and use a hash key to work out the name of that subject.
So to perform effective and one-way anonymisation, all I need do is compute the SHA-1 hash key for a subject’s name, and then refer to that data in my database by the hash key. This is more reliable than using a CRC32 checksum, giving you greater assurance that no-one has tampered with the update, and is described here. To verify that its SHA-1 hash key is indeed as stated, and thus that the file is ‘good’.
Openssl dgst -sha1 MacOSXUpdate10.4.2.dmg
When you had downloaded that file, you could have used the Terminal command
How to sha checksum mac update#
You will see these quoted by Apple on an update page – for example, for the 10.4.2 update it states “SHA1= MacOSXUpdate10.4.2.dmg= 5a11375c29f1f656061189b9467cf9291153de46”. So I needed a one-way method of generating a unique key for each subject name that would not permit the reverse process, of working out the name for a given key: something known as a ‘one-way hash key’, and widely used to fingerprint files (such as OS X security patches) whose integrity needs to be checked. Unfortunately this was not a suitable solution, as I wanted to be able to add more data about both new and existing subjects in the future.Ĭreating an index file, which would allow me to look up the unique subject identifier for a given subject name, was not a good answer either, as it would enable reverse lookup: anyone using the anonymised database could then use the index file to identify whose data were whose, defeating the purpose of anonymisation. I could of course simply number each subject, and only store that number, instead of data fields that could be used to identify them. Under the Data Protection Act 1998, one robust approach is to render those data anonymous before performing any analysis on them, so I was looking for a secure way of achieving that. I recently wanted to carry out a survey involving sensitive personal information. สร้าง Project Vue.No matter how well you get to know OS X, its comprehensive capabilities never cease to surprise and delight.
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