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2014-05-28: TrueCrypt currently has security issues and is not recommended.

If you’re running GNU/Linux, dm-crypt with LUKS is the recommended encryption option.

Gentoo GNU/Linux maintains a guide for dm-crypt with LUKS.

Arch GNU/Linux maintains a guide to dm-crypt with LUKS. Also useable for Parabola GNU/Linux.

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DNS
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Google Public DNS permanently logs your ISP and location information for analysis. Your IP address is also stored for 24 hours.

OpenNIC has not adopted an official policy concerning log query privacy/anonymization. More information here.

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Google Public DNS
OpenDNS
Ελεύθερες Προτάσεις
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Gmail
GroupWise
IBM Notes
Microsoft Exchange
Microsoft Outlook
Yahoo! Mail
Yandex.Mail
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Αποθήκευση Αρχείων & Συγχρονισμός
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Why not MEGA? While MEGA is free as in beer, the software is proprietary code.

Why not SpiderOak? SpiderOak is proprietary software.

Why not Tarsnap? Tarsnap is partially proprietary and hosts your data on Amazon Web Services.

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Dropbox
Google Drive
Microsoft OneDrive
Άμεσα μηνύματα
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“Off-the-Record Messaging, commonly referred to as OTR, is a cryptographic protocol that provides strong encryption for instant messaging conversations. OTR uses a combination of the AES symmetric-key algorithm, the Diffie–Hellman key exchange, and the SHA-1 hash function. In addition to authentication and encryption, OTR provides perfect forward secrecy and malleable encryption.

The primary motivation behind the protocol was providing deniability for the conversation participants while keeping conversations confidential, like a private conversation in real life, or off the record in journalism sourcing.”

Wikipedia

Wikipedia

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Discord
Facebook Messenger
Google Hangouts
ICQ
LINE
Skype
Snapchat
Tencent QQ
Viber Messenger
WeChat
WhatsApp
Πλεγματοειδή Δίκτυα
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Ένα πλεγματοειδές δίκτυο είναι ένα αποκεντρωμένο ομότιμο δίκτυο, με συνδέσμους οι οποίοι ελέγχονται από τους χρήστες και συνήθως είναι ασύρματοι.

“Το πλεγματοειδές δίκτυο (τοπολογία) είναι ένας τύπος δικτύωσης όπου κάθε κόμβος πρέπει όχι μόνο να αποθηκεύει και να εκπέμπει τα δικά του δεδομένα, αλλά και να λειτουργεί ως κανάλι για άλλους κόμβους, δηλαδή πρέπει να συνεργάζεται έτσι ώστε να διαχέει τα δεδομένα στο δίκτυο.“

Wikipedia

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Google News
Λειτουργικά Συστήματα
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Apple, Google, and Microsoft are allegedly a part of PRISM. Their proprietary operating systems cannot be trusted to safeguard your personal information from the NSA. We have two free alternatives: GNU/Linux and BSD.

GNU/Linux has a much larger community to help you with the transition. It’s recommended that you begin your explorations by looking for a GNU/Linux distribution that suits your needs. Additionally the Free Software Foundation hosts a list of completely Free distributions.

Debian has a long tradition of software freedom. Contributors have to sign a social contract and adhere to the ethical manifesto. Strict inclusion guidelines make sure that only certified open source software gets packaged in the main repositories.

Fedora is a community edition that serve as the stable basis for enterprise ready GNU/Linux distributions with commercial support. Companies all over the world trust Red Hat Inc. because of their transparency throughout the whole development process.

Canonical’s Ubuntu is not recommended by PRISM Break because it contains Amazon ads and data leaks by default. GNU/Linux distributions based on Ubuntu are also currently not recommended due to several other reasons.

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Παραγωγικότητα
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Riseup also offers email, XMPP, and chat services, all of which are accessible through Tor Hidden Service addresses. The list of these addresses is available here.

ProtectedText encrypts/decrypts text in the browser, and password (or it's hash) is never sent to the server - so that text can't be decrypted even if requested by authorities.

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Doodle
Evernote
Google Docs
GroupWise
Microsoft Outlook
Zoho Docs
Βίντεο & Φωνή
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Discord
Facebook
Skype
TeamSpeak
Ventrilo
Αναζήτηση Web
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DuckDuckGo is a software-as-a-service (SaaS) hosted around the world that provides you with anonymous search results from these sources. DDG open source components are available here.

There is also a DuckDuckGo hidden service at 3g2upl4pq6kufc4m.onion for Tor users.

MetaGer is a SaaS by the German non-profit SUMA e.V. that provides you with anonymous meta search results.

Startpage is a SaaS hosted in the USA and the Netherlands that provides you with anonymous Google search and image results through a free proxy.

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Google Search
Microsoft Bing
Yahoo Search
Yandex Search