Cossack Labs Blog

11 Feb 2016

Fixing Secure Comparator

After publishing Secure Comparator paper, we've received a number of concerns from the cryptographic community about possible security breach, in case, where one of the parties is intentionally falsifying the protocol. We've adressed these concerns, and, in this blog post and paper update would like to elaborate how and why. 


9 Dec 2015

Introducing Secure Comparator

Secure Comparator is a novel authentication technique we're proposing the cryptographic community to evaluate. It can be used as any id/secret pair authenticator in environments, where no trust relationships exist between two parties.


20 Nov 2015

WeakDH/LogJam vs Secure Session

Being asked several times 'Is Secure Session prone to attacks similar to WeakDH/LogJam', we've decided to outline some principal differences, which render Secure Session really secure from these attacks.


18 Nov 2015

Armoring ed25519 to meet extended security challenges

When developing new, advanced features of Themis library, we had to extend some of the ECC cryptography available in open source with our own implementation to provide simple point multiplication with random (unknown in advance) point. To achieve that, we've extended Daniel J. Bernstein's implementation of ed25519 with our own math and code. This blog post outlines our direction of thinking.


4 Nov 2015

Introducing Themis 0.9.2

Introducing updated and polished Themis, release 0.9.2.


1 Oct 2015

Building encrypted chat service with Themis and mobile websocket example

This tutorial shows simple ways of integrating cryptographic services presented by Themis cryptographic library into your already existing multi-platform application.


22 Sep 2015

Notes on adding cutting edge features

Some important notes on intruducing experimental, bleeding edge features to Themis, changes in Themis build system in the regard of these features, and a tease of new things to come.


3 Jun 2015

Releasing Themis into public: usability testing

How we did usability testing for Themis when releasing the open source library into public.

Being ready to release Themis, we've gathered a few colleagues and decided to make a test run on unsuspecting developers - how would the library blend into their workflows?


18 May 2015

Introducing Themis

We are proud to present Themis, a novel cryptographic services library.

Every good work of software starts by scratching a developer's personal itch. (The Cathedral and the Bazaar)


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