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Videoconferencing and instant messenger. Android version is experimental Alpha release. Among the aspects considered were: Telegram was rated 'critical' kritisch overall. The organization was favorable to Telegram's secure chats and partially open source code, but criticized the mandatory transfer of contact data to Telegram's servers and the lack of an imprint or address on the service's website.
It noted that while the message data is encrypted on the device, it could not analyse the transmission due to a lack of source code. Telegram's default chat function received a score of 4 out of 7 points on the scorecard. It received points for having communications encrypted in transit, having its code open to independent review, having the security design properly documented, and having completed a recent independent security audit. Telegram's default chat function missed points because the communications were not encrypted with keys the provider didn't have access to, users could not verify contacts' identities, and past messages were not secure if the encryption keys were stolen.
Telegram's optional secret chat function, which provides end-to-end encryption, received a score of 7 out of 7 points on the scorecard. In December , two researchers from Aarhus University published a report in which they demonstrated that MTProto does not achieve indistinguishability under chosen-ciphertext attack IND-CCA or authenticated encryption.
Nevertheless, they said they saw "no reason why [Telegram] should use a less secure encryption scheme when more secure and at least as efficient solutions exist". In April , accounts of several Russian opposition members were hijacked by intercepting the SMS messages used for login authorization. In June , Pavel Durov claimed publicly that U. Telegram has organized two cryptography contests to challenge its own security. Third parties were asked to break the service's cryptography and disclose the information contained within a secret chat between two computer-controlled users.
Both of these contests expired with no winners. The article also noted that "some users are concerned that Telegram's willingness to comply with Iranian government requests might mean future complicity with other Iranian government censorship, or even allow government access to Telegram's data on Iranian users".
Only requests regarding public content bots and sticker packs will be processed. In July , it was reported that China blocked access to Telegram Messenger. After week-long negotiations and seeming imminent blockage of the service, the conflict ceased after high officials pulled some strings with the regulator. On December 30, , during anti-government demonstrations across Iran , Telegram has shut down a channel of the Iranian opposition that published calls to use Molotov cocktails against the police, after receiving a complaint from the Iranian government.
Pavel Durov explained that the reason for the blocking was a "no calls to violence" policy and confirmed that criticizing local authorities, challenging the status quo and engaging in political debate were seen as "OK" by the platform, while "promoting violence" was not. Channels of the opposition remain operational. In March , Iran's chairman for the Committee for Foreign policy and National Security Alaeddin Boroujerdi announced that Telegram has been targeted to be fully blocked in Iran by 20 April , [] citing Telegram's role in facilitating the winter protests and the need to promote local apps.
On 13 April , Telegram was banned in Russia by a Moscow court, due to its refusal to grant the Federal Security Service FSB access to encryption keys needed to view user communications as required by federal anti-terrorism law. However, this led to unintended collateral damage due to usage of the platforms by other services in the country, including retail, Mastercard SecureCode, and Mail. Users ended up needing to use VPN to access the service as a result of the internet censorship.
App Store and Play Store refused the request of Russian government. On 28 March , Roskomnadzor reportedly [] sent a legally binding letter to Apple asking it to remove the app from its Russian App Store and block it from sending push notifications to local users who have already downloaded the app.
ISIS's media wing subsequently posted a video on Telegram, showing the pair pledging allegiance. In June , the Russian communications regulator Roscomnadzor hinted at the possibility of blocking Telegram in Russia due to its usage by terrorists.
In July , Director General of Application and Informatics of the Indonesian Ministry of Communication and Informatics , Semuel Abrijani Pangerapan, said eleven Telegram DNS servers were blocked because many channels in the service promoted radicalism, terrorism, hatred, bomb assembly, civil attack, disturbing images, and other propaganda contrary to Indonesian laws and regulations. Media related to Telegram Messenger at Wikimedia Commons. From Wikipedia, the free encyclopedia.
For other uses, see Telegram disambiguation. Telegram running on Android Lollipop. Blocked partially some ISPs or audio traffic. Information technology portal Cryptography portal Telecommunications portal Free software portal Freedom of speech portal Terrorism portal.
Retrieved 21 April Retrieved 8 April Retrieved 25 March Retrieved 31 January Retrieved 11 May Retrieved 20 March Retrieved 12 April Committee to Protect Journalists. Retrieved 20 July Retrieved 7 July Retrieved 11 December The New York Times. Retrieved 19 November Retrieved 18 March Retrieved 25 February Retrieved 31 March Retrieved 11 October Retrieved 22 December Retrieved March 31, Retrieved 23 February Archived from the original on 19 December Retrieved 2 December Retrieved 23 October Retrieved 18 May Retrieved 4 May Archived from the original on 25 April Hackers accessed Telegram messaging accounts in Iran - researchers".
Retrieved 3 August Retrieved 28 August Admins can use advanced permissions and butler bots to keep the peace". Retrieved 17 January Retrieved 25 October Retrieved 9 January Retrieved 17 March Retrieved 25 July When to Freak Out and When to Chill". Retrieved 8 January Retrieved 12 February So benutzt man den Messenger" in German. Retrieved 7 December Retrieved 23 January Retrieved 10 September Datenschutz im Test" [WhatsApp and alternatives: Stiftung Warentest in German.
Retrieved 2 March Retrieved 9 December Retrieved 15 June Retrieved 24 October Archived from the original on 7 March Retrieved 29 October Though it is claimed by many that the Telegram is banned, but it is operating normally in Iran. Retrieved 30 August Retrieved 14 September Retrieved 31 May Retrieved 1 February Retrieved 13 April Retrieved 20 October Retrieved 15 December Retrieved 26 June