Informations about SSL certificates and networks security
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Kalyna is a block cipher that became a Ukrainian national standard in 2015. It supports block and key sizes of 128, 256, and 512 bits. Its structure looks like AES but optimized for 64-bit CPUs, and it has a complicated key schedule. Rounds range from 10-18, depending on block and key sizes. There is some … Read More “Kalyna Block Cipher” »
I have written a paper with Orin Kerr on encryption workarounds. Our goal wasn’t to make any policy recommendations. (That was a good thing, since we probably don’t agree on any.) Our goal was to present a taxonomy of different workarounds, and discuss their technical and legal characteristics and complications. Abstract: The widespread use of … Read More “New Paper on Encryption Workarounds” »
Useful best practices for malware writers, courtesy of the CIA. Seems like a lot of good advice. General: DO obfuscate or encrypt all strings and configuration data that directly relate to tool functionality. Consideration should be made to also only de-obfuscating strings in-memory at the moment the data is needed. When a previously de-obfuscated value … Read More “The CIA's “Development Tradecraft DOs and DON'Ts”” »
The Linux encryption app Cryptkeeper has a rather stunning security bug: the single-character decryption key “p” decrypts everything: The flawed version is in Debian 9 (Stretch), currently in testing, but not in Debian 8 (Jessie). The bug appears to be a result of a bad interaction with the encfs encrypted filesystem’s command line interface: Cryptkeeper … Read More “Cryptkeeper Bug” »
Back in March, Rolf Weber wrote about a potential vulnerability in the WhatsApp protocol that would allow Facebook to defeat perfect forward secrecy by forcibly change users’ keys, allowing it — or more likely, the government — to eavesdrop on encrypted messages. It seems that this vulnerability is real: WhatsApp has the ability to force … Read More “WhatsApp Security Vulnerability” »
New paper: “A Simple Power Analysis Attack on the Twofish Key Schedule.” This shouldn’t be a surprise; these attacks are devastating if you don’t take steps to mitigate them. The general issue is if an attacker has physical control of the computer performing the encryption, it is very hard to secure the encryption inside the … Read More “Twofish Power Analysis Attack” »
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Signal, the encrypted messaging app I prefer, is being blocked in both Egypt and the UAE. Recently, the Signal team developed a workaround: domain fronting. Signal’s new anti-censorship feature uses a trick called “domain fronting,” Marlinspike explains. A country like Egypt, with only a few small internet service providers tightly controlled by the government, can … Read More “How Signal Is Evading Censorship” »
A few days ago, I blogged an excellent essay by Filippo Valsorda on why he’s giving up on PGP. Neal Walkfield wrote a good rebuttal. I am on Valsorda’s side. I don’t like PGP, and I use it as little as possible. If I want to communicate securely with someone, I use Signal. Powered by … Read More “The Pro-PGP Position” »
The Encryption Working Group of the House Judiciary Committee and the House Energy and Commerce Committee has released its annual report. Observation #1: Any measure that weakens encryption works against the national interest. Observation #2: Encryption technology is a global technology that is widely and increasingly available around the world. Observation #3: The variety of … Read More “Encryption Working Group Annual Report from the US House of Representatives” »