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The cryptsetup command-line interface, by default, does not write any headers to the encrypted volume, and hence only provides the bare essentials: encryption settings have to be provided every time the disk is mounted (although usually employed with automated scripts), and only one key can be used per volume; the symmetric encryption key is directly derived from the supplied passphrase.
Modern hard drives feature an ability to recover from some read/write errors by internally remapping sectors and performing other forms of self-test and recovery. The process for this can sometimes take several seconds or (under heavy usage) minutes, during which time the drive is unresponsive.
In particular, the POSIX specification and the Linux man page signal (7) require that all system functions directly or indirectly called from a signal function are async-signal safe. [ 6 ] [ 7 ] The signal-safety(7) man page gives a list of such async-signal safe system functions (practically the system calls ), otherwise it is an undefined ...
Alternatives to prevent jobs from being terminated include nohup and using a terminal multiplexer. A job running in the foreground can be stopped by typing the suspend character . This sends the "terminal stop" signal (SIGTSTP) to the process group. By default, SIGTSTP causes processes receiving it to stop, and control is returned to the shell.
On a Linux system, the boot partition (/boot) may be encrypted if the bootloader itself supports LUKS (e.g. GRUB). This is undertaken to prevent tampering with the Linux kernel. However, the first stage bootloader or an EFI system partition cannot be encrypted (see Full disk encryption#The boot key problem). [14]
Starting with version 4.0, the alternative command line processors 4DOS and NDOS supported /F and the corresponding CritFail=Yes directive in 4DOS.INI/NDOS.INI as well. The option was also supported by the COMMAND.COM of PTS-DOS 6.51 and S/DOS 1.0, as well as by DR-DOS 7.02 and higher.
Scramdisk 4 Linux Hans-Ulrich Juettner 2005-08-06 [30] GPL: No SecuBox Aiko Solutions 2007-02-19 Proprietary: Yes SECUDE Secure Notebook SECUDE 2003 Proprietary: Yes Seqrite Encryption Manager Quick Heal Technologies Ltd. 2017 Proprietary: Yes Sentry 2020: SoftWinter 1998 [31] Proprietary: No Softraid / RAID C OpenBSD 2007-11-01 [32] BSD: Yes ...
Enhanced symmetric encryption utilities are available for Linux (and should also be portable to any other Unix-like system) including mcrypt and ccrypt. [4] While these provide support for much more sophisticated and modern algorithms, they can be used to encrypt [ 5 ] and decrypt files which are compatible with the traditional crypt(1) command ...