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Das inoffizielle Android-HandbuchDas inoffizielle Android-Handbuch
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Gut gerüstet gegen Überwachung im Web - Wie Sie verschlüsselt mailen, chatten und surfen: Wie Sie Verschlusselt Mailen, Chatten Und SurfenGut gerüstet gegen Überwachung im Web - Wie Sie verschlüsselt mailen, chatten und surfen: Wie Sie Verschlusselt Mailen, Chatten Und Surfen
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Nitrokey Storage 64GB (256bit AES 256 encryption)Nitrokey Storage 64GB (256bit AES 256 encryption)
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Yubico - YubiKey 5C NFC - Two Factor Authentication USB and NFC Security Key, Fits USB-C Ports and Works with Supported NFC Mobile Devices - Protect Your Online Accounts with More Than a PasswordYubico - YubiKey 5C NFC - Two Factor Authentication USB and NFC Security Key, Fits USB-C Ports and Works with Supported NFC Mobile Devices - Protect Your Online Accounts with More Than a Password
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Logitech K270 Wireless Keyboard, 2.4 GHz connection via USB Unifying receiver, 8 multimedia and Schortcut keys Splash-proof, 2-year battery life, German QWERTY layout - BlackLogitech K270 Wireless Keyboard, 2.4 GHz connection via USB Unifying receiver, 8 multimedia and Schortcut keys Splash-proof, 2-year battery life, German QWERTY layout - Black
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Benss USB Fingerprint Reader USB Fingerprint Sensor Fingerprint Scanner for PC Windows 10 USB Fingerprint Reader Security Key, 360 Degree Recognition with WQHL CertifiedBenss USB Fingerprint Reader USB Fingerprint Sensor Fingerprint Scanner for PC Windows 10 USB Fingerprint Reader Security Key, 360 Degree Recognition with WQHL Certified
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As of 2021-07-24 09:40
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Text Encryption

Text encryption can be useful for different purposes. There's the "easy hiding" of spoilers (e.g. using Caesar-Chiffre aka "ROT-13", also used with Geo-Caching), or Morse-Codes. And there are more serious things like safe-guarding sensitive information with real encryption. For all this, you can find matching Android apps:

Caesar-Cipher

2021-07-17

Caesar-Cipher is also known as "ROT" (from "rotate"), as the algorithm rotates the letters of the alphabet (e.g. 13 times with ROT-13), which is easily revertable. Caesar is said having used this to encrypt military correspondence, hence the name.

Morse Code

Morse code was used for telegraphy long ago. But it's still active in seafaring today (often as light signals), its best known example probably being the SOS distress signal.

Morse Tutors

2021-07-17

General Morse apps

2021-07-17

Morse Keyboards

2021-07-18

Multiple text-encryption methods

2021-07-18

Text encryption with PGP

2021-07-18

Encryption with AES/DES

2021-07-18

Various other encryption apps

2021-07-18

Further Readings:

2021-07-24