美国“龙”飞船携滞留宇航员返航 结束近10个月太空滞留
美国太空探索技术公司“龙”飞船于美东时间18日1时05分（北京时间18日13时05分）脱离国际空间站，搭载4名宇航员启程返航，计划当日17时57分（北京时间19日5时57分）在佛罗里达州附近海域溅落。
此次返航的机组中包含因“星际客机”飞船推进器故障滞留太空持续317天的美国宇航员威尔莫尔和威廉姆斯，两人原定2024年6月返航但因推进系统故障被迫延长驻留。
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The super secure UAE-based Telegram messenger service, developed by Russian-born software icon Pavel Durov, is looking to raise $1bn through a bond placement to a limited number of investors from Russia, Europe, Asia and the Middle East, the Kommersant daily reported citing unnamed sources on February 18, 2021.The issue reportedly comprises exchange bonds that could be converted into equity in the messaging service that is currently 100% owned by Durov and his brother Nikolai.Kommersant reports that the price of the conversion would be at a 10% discount to a potential IPO should it happen within five years.The minimum bond placement is said to be set at $50mn, but could be lowered to $10mn. Five-year bonds could carry an annual coupon of 7-8%.
Telegram’s stand out feature is its encryption scheme that keeps messages and media secure in transit. The scheme is known as MTProto and is based on 256-bit AES encryption, RSA encryption, and Diffie-Hellman key exchange. The result of this complicated and technical-sounding jargon? A messaging service that claims to keep your data safe.Why do we say claims? When dealing with security, you always want to leave room for scrutiny, and a few cryptography experts have criticized the system. Overall, any level of encryption is better than none, but a level of discretion should always be observed with any online connected system, even Telegram.
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