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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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FIDO2 Security Key, Thetis Security Key [Foldable] Two Factor Authentication USB (Type A) for Extra Protection in Windows/Linux/Mac OS, Gmail, Facebook, Dropbox, SalesForce, GitHubFIDO2 Security Key, Thetis Security Key [Foldable] Two Factor Authentication USB (Type A) for Extra Protection in Windows/Linux/Mac OS, Gmail, Facebook, Dropbox, SalesForce, GitHub
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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

2023-05-18

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

2023-05-18

General Morse apps

2023-05-18

Morse Keyboards

2023-05-18

Multiple text-encryption methods

2023-05-18

Text encryption with PGP

2023-05-18

Encryption with AES/DES

2023-05-18

Various other encryption apps

2023-05-18

Further Readings:

2023-05-29