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Kensington VeriMark IT Fingerprint Reader and Scanner for Windows 10 Hello, Biometric Security Scanner for Business K64704EUKensington VeriMark IT Fingerprint Reader and Scanner for Windows 10 Hello, Biometric Security Scanner for Business K64704EU
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Yubico Security Key NFC - Two Factor Authentication USB and NFC Security Key, Fits USB-A Ports and Works with Supported NFC Mobile Devices - FIDO U2F and FIDO2 Certified - More Than a PasswordYubico Security Key NFC - Two Factor Authentication USB and NFC Security Key, Fits USB-A Ports and Works with Supported NFC Mobile Devices - FIDO U2F and FIDO2 Certified - More Than a Password
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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

2021-01-08

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

2021-01-08

General Morse apps

2021-01-08

Morse Keyboards

2021-01-09

Multiple text-encryption methods

2021-01-09

Text encryption with PGP

2021-01-09

Encryption with AES/DES

2021-01-09

Various other encryption apps

2021-01-09

Further Readings:

2021-01-15