Cryptography for Software and Web Developers
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- Lizbeth Bishop
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1 Cryptography for Software and Web Developers Part 5: Don t believe the crypto hype Hanno Böck / 10
2 The NSA scandal was the biggest boost for snake oil crypto of all time Threema, Telegram, Cryptocat, whistle.im, chiffry, tutanota, myenigma, Hike, Kontalk,... 2 / 10
3 At the moment a lot of people will try to sell you the latest easy-to-use super-secure crypto solution In most cases these should not be considered trustworthy 3 / 10
4 Telegram has a contest: They ll pay you $ if you can decrypt their sample messages Sounds good, right? But it only applies to passive attacks. No sidechannels, authentication issues, software bugs like buffer overflows, known-plaintext-attacks,... Moxie Marlinspike challenged the Telegram developers with a similar contest by defining a completely insecure protocol. They haven t responded. 4 / 10
5 Threema is proprietary But they provide a validation feature: App can log data packages and a small tool that s available in source form can verify if that s really the message encrypted with the corresponding private key How do you know if the logged package is the same that was sent? How do you know they don t embed secret data in the nonce? You just don t. The whole Threema validation is a scam. 5 / 10
6 We really could need some better crypto message systems Some people will tell you: What s the matter, we have PGP and Jabber with OTR, that s all you need Except that they re mostly unusable for normal users and have tons of strange properties PGP doesn t encrypt the Subject, has two modes where only one protects certain metadata, doesn t provide forward secrecy OTR only works if your communication partner is online, else it will be unencrypted 6 / 10
7 From everything I ve seen lately there are only two systems I find interesting: Pond and Textsecure Free software, source available Well documented strong crypto technologies that seem to make sense Created by people who know a lot about crypto 7 / 10
8 I find it hard to believe, but this is a real problem Made in Germany, SecurITy made in Germany / TeleTrusT etc. Peter Tauber (member of german parliament, CDU) wants german encryption Recently got a mail proposing a secure chat and phone system that uses german elliptic curves with 512 bit. (I assume they mean the Brainpool curves, however Brainpool has no curve with 512 bit) Don t use AES, it s a US-standard from the NSA - except that it has been created by researchers from Belgium 8 / 10
9 Crypto is good when it has been created in a trustworthy process It doesn t matter what kind of passport the researcher / developer creating the system has And finally: Be aware that Germany does not have a lot of high profile cryptographers. 9 / 10
10 Some reasonable questions you may ask: Crypto is hard. Do you have a crypto expert in your development team or has your software been reviewed by a crypto expert? Can I see the tecchnical details of the protocol? Can I see the source code? If the answer to any of these is No just ignore it 10 / 10
11 TextSecure Pond 11 / 10
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