Computer security, cybersecurity or information technology security (IT security) is the protection of computer systems and networks from the theft of or damage to their hardware, software, or electronic data, as well as from the disruption or misdirection of the services they provide.

• [[networks]]
• [[virus]]

• A Graduate Course in Applied Cryptography
• 信息安全从业者书单推荐
• Micro8 适用于初中级安全从业人员，乙方安全测试，甲方安全自检，网络安全爱好者等，企业安全防护与提高
• OPEN SECURITY TRAINING - Locally Hosted Classes
• International Journal of PoC or GTFO (Proof-of-Concept or Get The Fuck Out)

• Cryptography
• Block cipher mode of operation
• libsodium - A modern and easy-to-use crypto library.
• OpenSSL
• Open Quantum Safe
• Common Crypto

• Diffie–Hellman key exchange
• Oakley protocol

• restic is a backup program that is fast, efficient and secure. It supports the three major operating systems (Linux, macOS, Windows) and a few smaller ones (FreeBSD, OpenBSD).
• BorgBackup (short: Borg) is a deduplicating backup program. Optionally, it supports compression and authenticated encryption.

• age A simple, modern and secure encryption tool with small explicit keys, no config options, and UNIX-style composability. https://age-encryption.org

• Signal is a free, open source, messaging app for simple private communication with friends.
• Telegram is a messaging app with a focus on speed and security, it’s super-fast, simple and free.
  • telegram source code
  • End-to-End Encryption, Secret Chats This article on MTProto's End-to-End encryption is meant for advanced users.

• ProtonMail Secure Email Based in Switzerland
  • ProtonMail/WebClient: Official AngularJS web client for the ProtonMail secure email service.
• Tutanota is the world's most secure email service, easy to use and private by design. Sign up for free to take control of your mailbox.

• I2P (Invisible Internet Project) is an anonymizing network, offering a simple layer that identity-sensitive applications can use to securely communicate. All data is wrapped with several layers of encryption, and the network is both distributed and dynamic, with no trusted parties. This is a mirror of the official Monotone repository. https://geti2p.net
• Tor protects your privacy on the internet by hiding the connection between your Internet address and the services you use.

• Awesome Security, A collection of awesome software, libraries, documents, books, resources and cools stuffs about security.