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Yubico - YubiKey 5 NFC - USB and NFC - Security key with two-factor authentication, suitable for USB-A connections and works with supported NFC mobile devicesYubico - YubiKey 5 NFC - USB and NFC - Security key with two-factor authentication, suitable for USB-A connections and works with supported NFC mobile devices
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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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Kensington K67977WW VeriMark Ultra Secure USB Fingerprint Encryption for Windows Registration (Windows Hello) with Two Factor Authentication (U2F)Kensington K67977WW VeriMark Ultra Secure USB Fingerprint Encryption for Windows Registration (Windows Hello) with Two Factor Authentication (U2F)
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YUBICO Security Key NFCYUBICO Security Key NFC
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As of 2024-07-23 01:13
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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

2024-07-06

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

2024-07-06

General Morse apps

2024-07-06

Morse Keyboards

2024-07-06

Multiple text-encryption methods

2024-07-06

Text encryption with PGP

2024-07-06

Encryption with AES/DES

2024-07-06

Various other encryption apps

2024-07-06

Further Readings:

2024-07-20