PyBitmessage Security Scan on Branch v0.6

May 26 07:23 [raw]

Sure, Granny. Bitmessage sucks mightily, because its code is full of security holes and vulnerabilities exploitable by attackers.

May 26 07:35 [raw]

If there were a highly secure alternative to Bitmessage, with no encoding, regex, database, xss vectors, etc. with proper security auditing and proof of its security, how many people would use it?

May 26 10:35 [raw]

> If there were a highly secure alternative to Bitmessage An alternative to what exactly? To Bitmessage, the protocol, or to PyBitmessage, the reference open-source Python client maintained by Peter Surda?

May 26 18:34 [raw]


May 26 22:58 [raw]

No, it does not mean that. However there are some severe security issues with Bitmessage. 1. Pickle - remove it entirely, use flat text files and pattern matching to sort the data - no external module should be used for sorting data. 2. XML - remove it entirely, use flat text files or monkeypatch - same as pickle - XSS exploits can attack through this module. 3. Eval() - thankfully was removed, should not be used at all. When coding high security software you do not rely on external libraries unless they are certified high security and someone is accountable for it and standing behind the product. You roll your own functions from scratch, tailored to the security application, to eliminate attack surface. OpenSSL is an example. It can't be trusted. Switch to LibreSSL or roll your own. TLS is an example. It can't be trusted. Switch to SSH or roll your own. The BSD crew got it right with crypto security and they stand behind it and are accountable, so it is marginally safe to use their libraries. This is not so for OpenSSL, TLS and most Python libraries.

May 27 05:30 [raw]

> You don't roll your own security functions EVER " . . . anyone concerned with real security probably should consider using something other than the same cipher as everyone else. . . . . . Our opponents operate in secrecy and do not reveal their successes. If they break our cipher and take some care to protect the results, we will continue to use that broken cipher, all the while assuming our data is protected. Confidence from long use is a self-delusion that springs from not specifically being told that our cipher has failed. We hope that our lack of knowledge means that our cipher has not been broken. But if hope were enough, we wouldn’t need cryptography." (Terry Ritter) [] This article is a must read. It debunks the myth that you should not roll your own crypto. What if our enemy is the open source crytpo community itself? What if they have given us ciphers to which they know the back door or quadratic equations to disassemble ciphertexts? Then they tell us, "use our crypto, NEVER roll your own." What if?

May 27 07:47 [raw]

Ritter is right. Herd is wrong. Somebody please read Snowden leaks. NSA spends millions and millions on dedicated HARDWARE to attack crypto. Now think about their "joy" when they discover that their ultra-speed cracking machines are totally useless, because more and more people use "custom crypto". My personal advice for people would be: use also polymorphic cryptography to keep NSA in the dark even more. I know people who replaced ciphers in source code of their in-house SSH implemetations. I know people who use block ciphers without their respective keyschedules, but with loading random bits directly to cipher state. I know people who kept "standard" ciphers and hashes in their SSH/SSL but they patched constants used in these ciphers/hashes to make hardware attacks impossible. These people are not some boy scouts. They were INSIDE TLAs. They told me that these two strategies are a must to be more secure against surveillance.

May 27 09:26 [raw]

"Loading random bits as round keys can significantly decrease strength of the cipher" Not really. Read Applied Cryptography, many ciphers can be strengthened using independent random subkeys. Also, how changing some "nothing in my sleeve" constants in SHA algorith with some purely random ones can make it weaker? SHA security does not depend on exact values of these constants. You can replace Pi with any otrher random data in Blowfish. You can directly load random data to Blowfish state. You can use random subkeys in IDEA. You can skip keyscheduling in TEA ciphers family. And so on. Of course in some ciphers constants and S-Boxes are explicitly predetermined by indispensable mathematical relations and can't be touched. But I am talking only about totally replaceable non-critical values. So one can easily patch his VeraCrypt copy to use non-standard constants and make NSA job a nightmare. And then we can apply such "rogue" ciphers in cascades.

May 27 09:57 [raw]

All of these are weak compared to the bastard nightmare I made.

May 27 10:20 [raw]

Tell me more.

May 27 11:21 [raw]

> Ritter is right. Herd is wrong. +1 Unlike the open source crypto gatekeepers, Ritter actually successfully sold his crypto to businesses and made a living of it. You will not find ego in any of his papers, whereas his detractors scream their own egotism and cultism, and have cult followings. I agree with your suggestion of polymorphism - each cipher should be polymorphic, use different keys, use random padding and xoring to eliminate metadata, and wrap at least 3 algorithms around each other. In addition to polymorphism the element of unavoidable work, where large memory resources are required to encrypt and decrypt, further frustrates brute force of keys and cryptanalysis. For starters key generation from the passphrase should take at least a few seconds and consume a couple hundred megs of ram. Then enciphering or deciphering each block should be difficult to a smaller degree. This makes running a cracker in parallel geometrically more expensive. Highly efficient ciphers with neglibible memory requirements are mathematically much more susceptible to brute forcing key space.

May 27 17:50 [raw]

I like nightmare stories. Spin the tale, dear detective.

May 28 10:50 [raw]

Congrats, now did you want to catch up on the last 20 years ?

May 29 03:19 [raw]

In case you haven't noticed, nothing has changed in 20 years. They're still using the same old crypto. And Ritter is still in business with his private consulting, making money just selling rights, for which businesses gladly pay a hefty sum, so they don't have to use openssl and GNU products.

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