Purpose of Pre-Boot Authentication (PBA)

  • Article ID: 109333
  • Updated: 29 May 2009


Product
Sophos SafeGuard Disk Encryption 4.60

Client OS

Windows 2000 Professional SP4, Windows XP SP3

Server OS

None

Question

What does Pre-Boot Authentication (PBA) do ?

Answer

Pre-Boot Authentication is a logon function that requires the user to authenticate himself before the boot process will start. Booting up the operating system without valid Sophos SafeGuard Disk Encryption logon data is not possible.

To prevent unauthorized access, invalid logins cause rapidly increasing response delays in the PBA screen. The mathematical formula for this delay is n³ (n to the power of 3).

- 1. false login leads to 1 second delay
- 2. false login leads to 8 seconds delay
- 3. false login leads to 27 seconds delay
- 4. false login leads to 64 seconds delay...


For security reasons, you should never deactivate the Pre-Boot Authentication !

For more information about Pre-Boot Authentication, please read "System Boot and Logon" in the Sophos SafeGuard Disk Encryption manual.


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If you need more information or guidance, then please contact technical support.

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