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Asked: 2016-01-06 22:46:36 +0800 CST

Maximum length of a LUKS passphrase

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Anyone know the maximum length of a LUKS passphrase?

The passphrase will be randomly generated, and I can create one with any length.

I am using CentOS 6 with Linux kernel 2.6.32-573.12.1.el6.x86_64, and cryptsetup-luks version 1.2.0-11.el6.x86_64

luks

1 Answers

  1. The built-in help function should display what options/limits were used: 

    cryptsetup --help

    ...
    Default compiled-in key and passphrase parameters:
    Maximum keyfile size: 8192kB,
    Maximum interactive passphrase length 512 (characters)
    Default PBKDF2 iteration time for LUKS: 1000 (ms)

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