On Fri, Jan 10, 2014 at 04:13:29AM -0800, gwen hastings wrote:
From the README...
DESCRIPTION
Pretty Curved Privacy (pcp1) is a commandline utility which can be used to encrypt files. pcp1 uses eliptc curve cryptography for encryption (CURVE25519 by Dan J. Bernstein). While CURVE25519 is no worldwide accepted standard it hasn't been compromised by the NSA - which might be better, depending on your point of view.
sounds like my pbp:
https://github.com/stef/pbp
except with a 'c' and less features, from the readme:
v0.2 - experimental
PBP[0] is a simple python wrapper and a command line interface around
libsodium, to provide basic functionality resembling PGP. It uses
scrypt for a KDF and a much simpler packet format, which should be
much harder to fingerprint, pbp also provides an experimental forward
secrecy mode and a multi-party DH mode.
Installation
pip install pbp
you possibly need to run (or an equivalent command) sudo apt-get install git
python-virtualenv gcc python-dev libffi-dev to satisfy all basic dependencies.
Design goals:
1. use modern crypto
2. provide similar functionality to PGP
3. be extensible
4. difficult to identify based on fingerprinting
5. provide extensive testing
6. strive for security
Crypto
Cryptographic primitives are based on the NaCl library from
http://nacl.cr.yp.to. The KDF used is scrypt.
PGP-like
Provides basic public key encrypt/decrypt, sign/verify and secret key
encrypt/decrypt modes, as well as the ability to sign, verify, list,
generate, export and import keys.
Extensibility
using pbp and the underlying pysodium[1] library it's easy to extend
pbp. Some examples are the experimental forward secrecy mode (see
description in docs/chaining-dh.txt), the support for ECDH key
exchanges from the command-line and generation of arbitrarily large
random byte streams.
[1] https://github.com/stef/pysodium also available on
https://pypi.python.org/pypi/pysodium
Fingerprinting
pbp tries to avoid to store any sensitive plaintext info, the
encrypted files all should look like random noise. for a description
of the packet formats see docs/fileformats.txt.
Testing
All py files come with their internal tests, unit tests are in
tests.py, and commandline functionality is tested in test.sh.
Security
pbp locks the process memory, so it cannot be swapped to disk. Also
pbp uses SecureString[2] to overwrite sensitive key material after
usage in memory, so keys have a short window of opportunity to leak.
[2] https://github.com/dnet/pysecstr
Usage
Generate a key
pbp -g -n alice
sending howdy.txt using public key encryption from alice to bob
pbp -c -S alice -r bob -i howdy.txt
decrypt an encrypted file using public key crypto
pbp -d -S bob -i howdy.txt.pbp
sending howdy.txt using secret key encryption
pbp -c -i howdy.txt
decrypt an encrypted file using secret key crypto
pbp -d -i howdy.txt.pbp
sign howdy.txt
pbp -s -S alice -i /howdy.txt
verify howdy.txt
pbp -v -i howdy.txt.sig
sign bobs key
pbp -m -S alice -n bob
check sigs on carols key
pbp -C -n carol
alice encrypts howdy.txt to bob using experimental forward secret mode
pbp -e -S alice -r bob -i howdy.txt -o ./secret-message
bob decrypts howdy.txt from alice using experimental forward secret mode
pbp -E -S bob -r alice -i ./secret-message
initiate ECDH key exchange
pbp -D1
respond to ECDH key exchange
pbp -D2 -Dp 'public component from D1'
finish ECDH key exchange
pbp -D3 -Dp 'public component from D2' -De 'secret exponent from D1'
random streaming 23GByte of cryptographic randomness
pbp -R -Rs 23G -o /mnt/huge_fs/random_data
participate in a 4-way DH exchange, 1st message
pbp -Ds -Dp 4 -S alice -n 'friends001' -i oldkeychain -o newkeychain
participate in a 4-way DH exchange, 2nd message
pbp -De -S alice -n 'friends001' -i oldkeychain -o newkeychain
this is one big pipe that creates a 3-way ECDH secret between alice, bob and carol:
pbp -Ds -S alice -Dp 3 -n 'test-dh' -i /dev/null |
pbp -Ds -S bob -Dp 3 -n 'test-dh' |
pbp -Ds -S carol -Dp 3 -n 'test-dh' |
pbp -De -S alice -Dp 3 -n 'test-dh' |
pbp -De -S bob -Dp 3 -n 'test-dh'
of course instead of a pipe you could use any kind of transport mechanism
(c) 2013, stf