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Documentation of Safeguard LanCrypt file format

MichaelMessner

Hello Sophos community,

 during an internal evaluation of Sophos LanCrypt I was wondering if there is some documentation of the encrypted file format that Safeguard LC uses/generates. Do you have some resources to documentation on that format?

Thank you very much,

Mike



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  • 0

    Hello Mike,

    If you're talking about the encryption algorithm LanCrypt uses to encrypt the files the clients can be configured to use XTS-AES or AES encryption.

  • 0 in reply to Toby_DataEncryption

    Hello Toby,

     thanks for answering. I am more interested in the meaning of the different bytes within the encrypted file. For example you can identify the encrypted blog quite easy and then there is a header with some clear text which gives you the information that it is a SafeGuard FileEncryption file. Then you can identify the key identifier and so on, but there are some other areas/bytes that are not that clear.

    Is there some documentation which describes every byte in the file?

    Best,

    Mike

  • 0 in reply to MichaelMessner

    MichaelMessner said:

    Is there some documentation which describes every byte in the file?

    I am not sure if this is publicly available information. The first 4K is always our file encryption header, so encrypted files and the GUID of their KEK can always be identified.