#数据库
在中国做数据库的，多少都听过 萨师煊 教授的名字，他撰写的《数据库系统概论》第一版于1983年出版，是中国大陆第一本讲解数据库系统实现的专著，人民大学在数据库领域也是内地最强的几所高校之一。
今天看到《萨师煊教授：国产数据库学科的拓荒人与奠基者》一文中提及他的家世，才知道这么显赫：
* 萨氏源于山西雁门萨氏先祖，已有六七百年的历史，祖先是蒙古色目人。
* 最早的先祖是元代四大诗人之一的萨都剌，曾官至南台侍御史，钦赐萨姓，此为萨氏家族立姓之始。
* 萨都剌的孙子萨仲礼是元统年间（1333年）的进士，官至福建行中书省检校，举家由晋迁闽，子孙繁衍渐成望族。
* 后人中包括：爱国海军将领 萨镇冰、中山舰长 萨师俊，物理学家 萨本栋、化学家 萨本铁、微电子学家 萨支唐、数学家 萨支汉等等。
BY codedump的电报频道
elegram is updating its messaging app with options for auto-deleting messages, expiring invite links, and new unlimited groups, the company shared in a blog post. Much like Signal, Telegram received a burst of new users in the confusion over WhatsApp’s privacy policy and now the company is adopting features that were already part of its competitors’ apps, features which offer more security and privacy. Auto-deleting messages were already possible in Telegram’s encrypted Secret Chats, but this new update for iOS and Android adds the option to make messages disappear in any kind of chat. Auto-delete can be enabled inside of chats, and set to delete either 24 hours or seven days after messages are sent. Auto-delete won’t remove every message though; if a message was sent before the feature was turned on, it’ll stick around. Telegram’s competitors have had similar features: WhatsApp introduced a feature in 2020 and Signal has had disappearing messages since at least 2016.
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.
codedump的电报频道 from br