This is evident from the subponea received by Signal from Eastern District of Virginia to provide details about two signal numbers. On the flip side, due to lack of aspirations for data monetization, Signal collects minimal meta data which is only required to effectively deliver its service. may collect metadata such as your IP address, devices and Telegram apps you've used, history of username changes, etc. , if collected, is stored for a maximum of 12 months before being deleted. This data if collected is stored for a span of 12 months before being deleted. Telegram’s privacy policy states that as a part of their spam and abuse prevention procedure they collect information such as IP addresses, device details, history of username changes, and more. The local database is encrypted with SQLCipher. Signal on the other hand stores messages in a local SQLite database once they are decrypted. Therefore, the entire security model of Telegram cloud relies upon trust in a centralized authority which from security standpoint is a flawed approach. The amount of popularity of Telegram especially in Authoritarian regimes makes Telegram a lucrative target for nation states. Secondly, in event of of compromise of Telegram’s infrastructure, an adversary can obtain security keys to decrypt conversations. There are still a couple of problems with this approach, first and foremost, since the encryption keys are stored on the server, technically Telegram can decrypt conversations stored on its cloud. The security key is distributed across different jurisdiction to prevent information disclosure from one country or small group of allies to request for data or key. Telegram claims to have data stored across distributed infrastructure with, it’s cloud data heavily encrypted. Where-as group chats for telegram are not encrypted.īy default, Telegram chats are stored on cloud unless secret chat is enabled. Group chats for Signal are encrypted with end to end encryption by using Multi-party Off-the-Record Messaging (mpOTR). Telegram describes the reason being "convenience" as Telegram normal conversations are stored encrypted in the cloud and can be synced across multiple devices, where-as a secret has to be backed up manually. This makes Telegram's default conversations even less secure than WhatsApp as E2E is applied by default on WhatsApp for all conversations. Both, Signal and Telegram support End to end encryption (E2E), however, the Signal has E2E is enabled by default, where-as in the case of Telegram a secret chat has to be initiated to enable E2E on the conversation to conversation basis. First and foremost, in security, we rely upon technologies that are secure by default.
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