Is ccrypt AES 256 bit crypto secure enough? Post: 302887079

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Special Forums Cybersecurity Is ccrypt AES 256 bit crypto secure enough? Post 302887079 by Perderabo on Wednesday 5th of February 2014 01:33:39 PM

02-05-2014

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Yeah, but read that page the OP linked. It's only 2 sentences or so. It says "However, in the AES standard a 128-bit block size is used, whereas ccrypt uses a 256-bit block size." I don't understand how someone can read that and conclude that AES is in use.

gpg (gnu privacy guard) is open source and should be immune to the back door intentionally placed in prodcuts. Your link about key recovery is worrisome. But they need both ciphertext and plaintext to recover the key.

The word here at work is that we are required to AES-256 still. As long as I can convince a security auditor that AES-256 is in use I am covered. I can do that with gpg. I would not want to try with ccrypt.

AES-256 is a symmetric key algorithm. What symmetric key algorithm would you replace AES-256 with? Those longer keys you mention are usually associated with public key encryption.

Our mandate to use AES-256 ultimately comes from the US Department of Defense who seems to feel that it is adequate protection.

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LEARN ABOUT FREEBSD

aesni

AESNI(4)						   BSD Kernel Interfaces Manual 						  AESNI(4)

NAME

     aesni -- driver for the AES accelerator on Intel CPUs

SYNOPSIS

     To compile this driver into the kernel, place the following lines in your kernel configuration file:

	   device crypto
	   device aesni

     Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):

	   aesni_load="YES"

DESCRIPTION

     Starting with some models of Core i5/i7, Intel processors implement a new set of instructions called AESNI.  The set of six instructions
     accelerates the calculation of the key schedule for key lengths of 128, 192, and 256 of the Advanced Encryption Standard (AES) symmetric
     cipher, and provides a hardware implementation of the regular and the last encryption and decryption rounds.

     The processor capability is reported as AESNI in the Features2 line at boot.  The aesni driver does not attach on systems that lack the
     required CPU capability.

     The aesni driver registers itself to accelerate AES operations for crypto(4).  Besides speed, the advantage of using the aesni driver is that
     the AESNI operation is data-independent, thus eliminating some attack vectors based on measuring cache use and timings typically present in
     table-driven implementations.

SEE ALSO

     crypt(3), crypto(4), intro(4), ipsec(4), padlock(4), random(4), crypto(9)

HISTORY

     The aesni driver first appeared in FreeBSD 9.0.

AUTHORS

     The aesni driver was written by Konstantin Belousov <kib@FreeBSD.org>.  The key schedule calculation code was adopted from the sample pro-
     vided by Intel and used in the analogous OpenBSD driver.

BSD
								 September 6, 2010							       BSD