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Special Forums Cybersecurity Is ccrypt AES 256 bit crypto secure enough? Post 302887067 by Perderabo on Wednesday 5th of February 2014 12:43:27 PM
Old 02-05-2014
I have never heard of ccrypt and your link does not convince me that AES-256 is in use. I mostly use gpg for AES-256 bit encryption. Like this:

Code:
gpg -c --cipher-algo aes256 secret.txt

and to decrypt the file:

Code:
gpg secret.txt.gpg

Your link talks about using Rijndael, not AES. Read the AES page on wikipedia. Only 3 members of the Rijndael family are used in AES and all of them have a block size 128 bits. Your link says ccrypt is using a blocksize of 256 bits. I wonder if you have block size and key size confused? ccrypt may be good enough for your purposes, but based on your llink I will stay with gpg.
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GPG-ZIP(1)							 GNU Privacy Guard							GPG-ZIP(1)

NAME
gpg-zip - Encrypt or sign files into an archive SYNOPSIS
gpg-zip [options] filename1 [ filename2, ... ] directory1 [ directory2, ... ] DESCRIPTION
gpg-zip encrypts or signs files into an archive. It is an gpg-ized tar using the same format as used by PGP's PGP Zip. OPTIONS
gpg-zip understands these options: --encrypt -e Encrypt data. This option may be combined with --symmetric (for output that may be decrypted via a secret key or a passphrase). --decrypt -d Decrypt data. --symmetric -c Encrypt with a symmetric cipher using a passphrase. The default symmetric cipher used is CAST5, but may be chosen with the --cipher-algo option to gpg. --sign -s Make a signature. See gpg. --recipient user -r user Encrypt for user id user. See gpg. --local-user user -u user Use user as the key to sign with. See gpg. --list-archive List the contents of the specified archive. --output file -o file Write output to specified file file. --gpg gpgcmd Use the specified command gpgcmd instead of gpg. --gpg-args args Pass the specified options to gpg. --tar tarcmd Use the specified command tarcmd instead of tar. --tar-args args Pass the specified options to tar. --version Print version of the program and exit. --help Display a brief help page and exit. EXAMPLES
Encrypt the contents of directory 'mydocs' for user Bob to file 'test1': gpg-zip --encrypt --output test1 --gpg-args -r Bob mydocs List the contents of archive 'test1': gpg-zip --list-archive test1 DIAGNOSTICS
The program returns 0 if everything was fine, 1 otherwise. SEE ALSO
gpg(1), tar(1), The full documentation for this tool is maintained as a Texinfo manual. If GnuPG and the info program are properly installed at your site, the command info gnupg should give you access to the complete manual including a menu structure and an index. GnuPG 2.0.22 2014-06-10 GPG-ZIP(1)
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