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MongoDB深究之ObjectId

ctf 之 objectId

An ObjectId is a 12 byte BSON type and it is in the following structure:

  • The first 4 bytes are the seconds since the unix epoch
  • The next 3 bytes are the machine identifier.
  • The next 2 bytes are the process id.
  • The last 3 bytes are the counter value.

计算ObjectId 4字节时间

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