✳️ DIGITAL RIGHTS | PRIVACY ✳️

France wants to ban public Wi-Fi and Tor in wake of Paris attacks

French law enforcement wants to ban the use of public Wi-Fi and the secure web network Tor when a state of emergency is declared.

http://mashable.com/2015/12/07/france-ban-tor-wifi/

#tor #wifi #censorship #privacy

✳️ TELEGRAM | OFFICIAL UPDATES ✳️

Telegram's next update comes out today! Good times for Sticker Lovers ;)
You can read here the full update:

http://telegramgeeks.com/2015/12/clearing-cache-and-reordering-stickers/

✳️ TELEGRAM | TIPS ✳️


☎️ When is my phone number visible ☎️

1⃣ If you add someone (adding the person as a phone contact) and write them a message, the recipient will be able to see your number.
2⃣ If you contact another user via a username, forwarded message or group, your numbers remain 'unknown', until shared.
3⃣ Once the number is shared, you will always see it — even if you delete it from your contacts list. No reason to hide it again.

#tips

❎ CHANNELS | NEW CHANNEL RELEASED ❎

Hi guys, we'd like to share with you a Telegram Channel you may like ;)
@tlgrmChannels

👇👇👇

Nice implementation of #tabs at Telegram Plus Messenger.

Official client needs that too.

❎ TABS | Plus Messenger Tabs implemented in Telegram ❎

This is how Plus Messenger tabs would look like in Telegram.
@newsTelegram

✳️ IDEAS | PINNING MESSAGES ✳️

David Rivera, from Santo Domingo did a conceptual art for his idea:

Pinning messages or files in a group chat

Full gallery: https://www.behance.net/gallery/32005399/Telegram-Message-Pinning-Concept


#idea #conceptArt #pin

✳️ SECURITY | CRYPTOGRAPHY ✳️

Computer Science Master's thesis
Aarhus University Denmark 🇩🇰
_________________
🔧 A practical cryptanalysis of the Telegram messaging protocol
_________________
👥 Author: Jakob Bjerre Jakobsen
👥 Supervisor: Claudio Orlandi
_________________
Full document: http://cs.au.dk/~jakjak/master-thesis.pdf

#security #cryptography #cryptanalysis #MTProto

✳️ SECURITY | CRYPTOGRAPHY ✳️


‼️ CONCLUSIONS ‼️

▶️ In this work we have shown that Telegram, with its use of aging primitives, does not manage to provide data integrity of ciphertexts nor authenticated encryption, and is vulnerable to chosen-ciphertext attacks.

▶️ The attempt to mitigate known attacks has introduced new vulnerabilities, and we suggest that the Telegram team updates its protocol to use strong, modern primitives.

▶️ For message authentication codes it should use a good HMAC, use a proper key derivation function, and up date the key exchange to use elliptic curve Diffie-Hellman based on Curve25519. Telegram has a great emphasis on computational performance of its protocol, which is why CTR with its parallelization seems to be the logical choice of encryption mode. We suggest using CTR instead of IGE mode, as IGE offers no benefits over CTR.

▶️Overall, we can conclude yet again that homegrown cryptography is a bad approach.

#security #cryptography #cryptanalysis #MTProto

✳️ SECURITY | CRYPTOGRAPHY ✳️

📕 ABSTRACT 📕


▶️Telegram is a popular messaging app which supports end-to-end encrypted communication. In Spring 2015 we performed an audit of Telegram's source code. This short paper summarizes our findings.

▶️ Our main discovery is that the symmetric encryption scheme used in Telegram -- known as MTProto -- is not IND-CCA secure, since it is possible to turn any ciphertext into a different ciphertext that decrypts to the same message.

▶️ We stress that this is a theoretical attack on the definition of security and we do not see any way of turning the attack into a full plaintext-recovery attack. At the same time, we see no reason why one should use a less secure encryption scheme when more secure (and at least as efficient) solutions exist.

▶️ The take-home message (once again) is that well-studied, provably secure encryption schemes that achieve strong definitions of security (e.g., authenticated-encryption) are to be preferred to home-brewed encryption schemes.

#security #cryptography #cryptanalysis #MTProto

❎ TELEGRAM | APPLE BLOCKING ❎

Apple forces Telegram to block @vkmusic_bot

http://telegramgeeks.com/2015/12/apple-forces-telegram-to-block-a-music-bot/

#apple #censorship #iOS

Hack to avoid iOS block: Just add the bot into a group. | #hack via @paquebot developer

💥 BREAKING! | WHATSAPP BLOCKING IN BRAZIL💥

http://telegramgeeks.com/2015/12/justice-determines-whatsapp-lock-in-brazil-for-48-hours/

#brazil #blocking #whatsapp #48H

🚀 TELEGRAM | 500.000 NEW USERS IN BRAZIL 🚀

🤘The Official Telegram twitter account informs that 'more than 1.000.000 new users joining Telegram from Brazil today and growing. If you've just joined, check this out: https://t.co/x1haKyjvzQ '

🚨 Two guys rescued thanks to Telegram 🚨

Even better news :)
http://telegramgeeks.com/2015/12/two-guys-rescued-thanks-to-telegram/

✳️ ANDROID |TIPS ✳️

📱 Recurring Notifications on Android 📱

❗️ Problem: When you have unread personal messages, Android notifications will repeat every hour until you open the message.

✅ Solution: Go to Settings -> Notifications and Sounds -> Repeat Notifications and select a repeat period or turn repeated notifications off altogether.

#tips #android