这基本上取决于您的内核,因此“ See / proc / crypto ”应该是“答案”。cryptsetup手册页说:
NOTES ON SUPPORTED CIPHERS, MODES, HASHES AND KEY SIZES
The available combinations of ciphers, modes, hashes and key sizes depend
on kernel support. See /proc/crypto for a list of available options. You
might need to load additional kernel crypto modules in order to get more
options.
For the --hash option, if the crypto backend is libgcrypt, then all algo‐
rithms supported by the gcrypt library are available. For other crypto
backends some algorithms may be missing.
但是,我/proc/crypto
没有提到任何蛇,也没有提到xts(aes),所以我建议您查看哪些cryptsetup benchmark
报告(它也会显示(ram)速度)。例如:
$ cryptsetup benchmark
# Tests are approximate using memory only (no storage IO).
PBKDF2-sha1 292752 iterations per second
PBKDF2-sha256 221362 iterations per second
PBKDF2-sha512 142010 iterations per second
PBKDF2-ripemd160 277124 iterations per second
PBKDF2-whirlpool 155727 iterations per second
# Algorithm | Key | Encryption | Decryption
aes-cbc 128b 164.7 MiB/s 164.5 MiB/s
serpent-cbc 128b 119.5 MiB/s 205.0 MiB/s
twofish-cbc 128b 163.5 MiB/s 208.6 MiB/s
aes-cbc 256b 148.4 MiB/s 147.9 MiB/s
serpent-cbc 256b 128.1 MiB/s 205.3 MiB/s
twofish-cbc 256b 202.3 MiB/s 213.1 MiB/s
aes-xts 256b 165.4 MiB/s 145.3 MiB/s
serpent-xts 256b 150.0 MiB/s 194.5 MiB/s
twofish-xts 256b 206.4 MiB/s 206.9 MiB/s
aes-xts 512b 149.4 MiB/s 147.5 MiB/s
serpent-xts 512b 181.7 MiB/s 195.0 MiB/s
twofish-xts 512b 207.1 MiB/s 208.6 MiB/s
哈希是前几行(sha1,sha256,sha512,tripmd160,漩涡)。密码位于“算法”标题下。
查看默认值是什么也可以让您对“相当好”有所了解:
$ cryptsetup --help|tail -n 8
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)
Default compiled-in device cipher parameters:
loop-AES: aes, Key 256 bits
plain: aes-cbc-essiv:sha256, Key: 256 bits, Password hashing: ripemd160
LUKS1: aes-xts-plain64, Key: 256 bits, LUKS header hashing: sha1, RNG: /dev/urandom
并且使用更大的键大小(带有--key-size
)应该更强一点,如果稍微慢一点。
--key-size, -s <bits>
Sets key size in bits. The argument has to be a multiple of 8.
The possible key-sizes are limited by the cipher and mode used.
See /proc/crypto for more information. Note that key-size in
/proc/crypto is stated in bytes.