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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)						      General Commands Manual							GPG-ZIP(1)

NAME
gpg-zip - encrypt or sign files into an archive SYNOPSIS
gpg-zip [OPTIONS] filename1 [filename2, ...] directory1 [directory2, ...] DESCRIPTION
This manual page documents briefly the gpg-zip command. gpg-zip encrypts or signs files into an archive. It is an gpg-ized tar using the same format as PGP's PGP Zip. OPTIONS
-e, --encrypt Encrypt data. This option may be combined with --symmetric (for output that may be decrypted via a secret key or a passphrase). -d, --decrypt Decrypt data. -c, --symmetric 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(1). -s, --sign Make a signature. See gpg(1). -r, --recipient USER Encrypt for user id USER. See gpg(1). -u, --local-user USER Use USER as the key to sign with. See gpg(1). --list-archive List the contents of the specified archive. -o, --output FILE" Write output to specified file FILE. --gpg GPG Use the specified command instead of gpg. --gpg-args ARGS Pass the specified options to gpg(1). --tar TAR Use the specified command instead of tar. --tar-args ARGS Pass the specified options to tar(1). -h, --help Output a short usage information. --version Output the program version. DIAGNOSTICS
The program returns 0 if everything was fine, 1 otherwise. 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 SEE ALSO
gpg(1), tar(1) AUTHOR
Copyright (C) 2005 Free Software Foundation, Inc. Please report bugs to <bug-gnupg@gnu.org>. This manpage was written by Colin Tuckley <colin@tuckley.org> and Daniel Leidert <daniel.leidert@wgdd.de> for the Debian distribution (but may be used by others). November 2006 GPG-ZIP(1)
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