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

2020-09-17

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.

Rot13 ↺ Edg13 (5@4) 0 $Contains no trackers known to us \o/$ LastUpdate: 2017-03-15
CaesarCipher (5@1) 0 $Contains no trackers known to us \o/$
Caesar (4.9@8) 2 2 LastUpdate: 2018-01-13
ROT13 (4.5@27) 0 $Contains no trackers known to us \o/$ LastUpdate: 2013-12-24
Caesar cipher - Encryption / automatic decryption (4.4@103) 2 $Contains no trackers known to us \o/$
Caesar Cipher Disk (4.3@169) 3 $Contains no trackers known to us \o/$ LastUpdate: 2019-03-15
ROT13 Translator (4.3@88) 0 $Contains no trackers known to us \o/$ LastUpdate: 2014-07-20
Caesar cipher (4.3@13) 2 1 LastUpdate: 2013-02-26
Pijaret (0@0) 0 $Contains no trackers known to us \o/$ LastUpdate: 2016-09-27 Github

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

2020-09-18

Morse Mania: Learn Morse Code (4.7@4,492) Ǥ 6 3
Morse Trainer for Ham Radio (4.6@329; ~EUR 3.25) 3 $Contains no trackers known to us \o/$ LastUpdate: 2018-01-06
Morse Code Trainer (4.2@4,929) 1 $Contains no trackers known to us \o/$ LastUpdate: 2013-07-22
Morse Mentor (4.2@247) 3 2
Morse App (Learn Morse code) (4.1@1,754) Ǥ 7 1 LastUpdate: 2014-11-27
Morse code - learn and play (4.1@548) 6 2 / Morse code - learn and play - Premium (4.5@112; ~EUR 2.00) 3 $Contains no trackers known to us \o/$
Learn Morse Code - G0HYN Learn Morse (4@71) 2 $Contains no trackers known to us \o/$
Mors. : The Morse Code Trainer (3.8@339) 2 4
Morse Audio - Morse Code Learn (3.8@39) Ǥ 3 $Contains no trackers known to us \o/$ LastUpdate: 2015-01-30
Morse Code Trainer & Learning Game - 2019 (2.3@9) 3 1
MorseTrainer (0@0) 0 $Contains no trackers known to us \o/$ Github

General Morse apps

2020-09-17

Scout: Morse Translator (5@13) Ǥ 5 2
BF4 Lantern & Morse Solver (4.8@944) 5 1
Morse Code Translator (4.7@74) 2 3
TwitMorse -Tweet morse code!- (4.5@17) Ǥ 4 5
Morse Code (4.4@5,330) 7 2
M³ Translator: Morse code (4.4@4,154) Ǥ 12 2
Morse Transmitter (4.3@1,076) 1 $Contains no trackers known to us \o/$ LastUpdate: 2012-10-16
Morse Torch (4.3@18) 2 $Contains no trackers known to us \o/$ LastUpdate: 2018-11-30
Pocket Talk (4.3@6) 5 LastUpdate: 2016-01-13
Morse (4.2@1,576) 5 2 LastUpdate: 2018-01-26
morsee : Enjoy Morse code (4.2@588) Ǥ 6 4
Morse Translator - Morse Code & Editable Alphabet (4.2@59) 7 2
Morse (4.2@5) 2 $Contains no trackers known to us \o/$ Github
Morse Code Translator (4.1@2,058) Ǥ 11 9
Morse Code Translator (3.9@1,259) 4 4 LastUpdate: 2017-02-15
Morse Code (3.9@380) 3 $Contains no trackers known to us \o/$ LastUpdate: 2014-08-04
SMS-Morse (3.8@16) 0 $Contains no trackers known to us \o/$
Morse Code Reader (3.7@1,684) 2 $Contains no trackers known to us \o/$ LastUpdate: 2013-08-27
Morse Me (3.7@79) Ǥ 9 4
Morse From RSS News Feeds (3.7@6) 2 $Contains no trackers known to us \o/$
Morse Decoder for Ham Radio (3.3@187; ~EUR 5.50) 6 $Contains no trackers known to us \o/$ LastUpdate: 2017-03-15

Morse Keyboards

2020-09-17

DotDash Keyboard (3.8@246) 1 $Contains no trackers known to us \o/$ LastUpdate: 2015-12-14 Github
Morse Code Keyboard (3.8@83) Ǥ 5 3 LastUpdate: 2018-12-08
MouseCode Keyboard (3.7@3) 1 $Contains no trackers known to us \o/$ LastUpdate: 2017-03-01
Morse Code Keyer (3.6@133) 4 2
Morse Straight Key (3.3@198) 1 $Contains no trackers known to us \o/$ LastUpdate: 2014-06-28

Multiple text-encryption methods

2020-09-17

Cryptography Fun (5@5) 0 $Contains no trackers known to us \o/$ LastUpdate: 2016-04-09 Caesar, Vigenere, Affine, Matrix, R.S.A.
Coooder - encode & encrypt (5@1) Ǥ 5 4 LastUpdate: 2019-02-09
Cipher - Decipher (4.6@33) 2 2 LastUpdate: 2017-06-09 Caesar Cipher, Vigenere Cipher, Playfair Cipher …
Ciphertext Tools - Classical Cryptography (4.5@11) 2 1
Cryptography - Collection of ciphers and hashes (4.4@2,923) Ǥ 8 2
Cipher Solver (4.4@181) 0 $Contains no trackers known to us \o/$ LastUpdate: 2016-11-10 Caesar, Vigenère …
Cipher Decoder Cipher Solver (4.3@2,365) Ǥ 7 4
⭐Message/Text Encryptor - Secure Encryption.⭐ (4.3@20) 3 1
Cipher Sender (4.2@90) 3 1 LastUpdate: 2017-07-05 Caesar Shift, Morse Code, Rail Fence, Rot13, Monoalphabetic Substitution, Vigenere, Letter-Number Code, Atbash, Keyboard Code;
Cipher Tool (4.2@16) 0 $Contains no trackers known to us \o/$
Decrypto (4.1@3,418) 4 2 LastUpdate: 2017-09-30 / DecryptoPro (4.3@197; ~EUR 1.75) 5 $Contains no trackers known to us \o/$ LastUpdate: 2017-09-30
Cipher tools (4.1@832) 1 $Contains no trackers known to us \o/$ LastUpdate: 2012-05-09 vigenere, mobile cipher, morse code, ascii code, binary code, oct code, hex code, base64 code, digital sum, reverse words or text, ROT cipher, roman numbers, braille decoder, fake text, front to back text, mathias sandorf, playfair
Universal Encoding Tool (4@147) 0 $Contains no trackers known to us \o/$ LastUpdate: 2018-09-22
CryptoTool (3.9@15) Ǥ 7 1 LastUpdate: 2016-11-08
Cryptography Tools - Ciphertext, Hashing, Encoding (3.8@13) 2 2
Encrypt Decrypt Tools (3.7@275) Ǥ 7 3
Cryptography Mean™ - Encryption, decryption tools (3.7@3) Ǥ 5 1 LastUpdate: 2018-07-24

Text encryption with PGP

2020-09-18

Latebra cryptographic app (4.6@8) Ǥ 21 5 encrypt SMS/Email
Tessercube (4.5@16) 20 $Contains no trackers known to us \o/$ Github
OpenKeychain: Easy PGP (4.3@3,227) Ǥ 20 1 Github; Kurzvorstellung 7/2015; Video Howto 9/2016 (DE); Howto 12/2017 | 2/2019; Wikipedia DE | EN
APG (4.2@13) 6 $Contains no trackers known to us \o/$ LastUpdate: 2014-04-04 Github; Description and Howto; Wikipedia (EN); Files + Mails
PGPClipper (4.1@11) 3 $Contains no trackers known to us \o/$ LastUpdate: 2018-12-12 Github
PGP SMS lite (3.9@156) 8 $Contains no trackers known to us \o/$ LastUpdate: 2016-05-30
PGPTools (3.5@110; ~EUR 1.00) 3 $Contains no trackers known to us \o/$ LastUpdate: 2017-11-14 / PGPFiles (2.5@20; ~EUR 1.00) 3 $Contains no trackers known to us \o/$ LastUpdate: 2017-04-25
PGP KeyRing (Trial Version) (2.8@38) 5 $Contains no trackers known to us \o/$ LastUpdate: 2018-10-31 / PGP KeyRing (3.6@57; ~EUR 3.00) 6 $Contains no trackers known to us \o/$ LastUpdate: 2018-10-31 maintain your PGP keyrings
OkcAgent (0@0; ~EUR 1.00) 2 $Contains no trackers known to us \o/$ Github; make OpenKeychain available in your Termux shell

Encryption with AES/DES

2020-09-18

DCipher (4.7@6) 2 Github
Notepad with password FREE (4.6@3,255) Ǥ 7 3 / Notepad with password PRO (4.3@75; ~EUR 3.00) 2 $Contains no trackers known to us \o/$
Encrypt It - MkII (4.6@38) 0 $Contains no trackers known to us \o/$ LastUpdate: 2014-05-14
Private Notepad - safe notes & lists (4.5@36,979) Ǥ 14 8
Encrypt text with CryptMax (4.4@75) 2 1 LastUpdate: 2017-01-18
SSE - File/Text Encryption & Password Vault (4.3@3,043) Ǥ 5 $Contains no trackers known to us \o/$ Password-Safe, texts, files, and more; cross-platform (Windows, Linux, Mac OS X, …); Open Source
AES Message Encryptor for SMS (4.3@130) 0 $Contains no trackers known to us \o/$ LastUpdate: 2017-01-15
Cryptool (4.3@105) 1 $Contains no trackers known to us \o/$ Github
SealNote Secure Encrypted Note (4.2@3,046) 2 $Contains no trackers known to us \o/$ LastUpdate: 2017-04-13 Github; Video Intro 4/2017
Sec Notes- Free Secure Notepad (4.2@1,242) Ǥ 10 3
DES Encryption (4.1@7) 0 $Contains no trackers known to us \o/$ LastUpdate: 2015-01-29
AES Encryption App FREE (4@44) 2 $Contains no trackers known to us \o/$ LastUpdate: 2014-06-20 / AES Encryption App Pro (4.9@9; ~EUR 0.75) 0 $Contains no trackers known to us \o/$ LastUpdate: 2014-06-20
Secure notes - Notepad (4@23) Ǥ 14 4 LastUpdate: 2018-06-13
Encrypt It (3.5@124) $Contains no trackers known to us \o/$ LastUpdate: 2013-08-22
CrocodileNote (3.5@14) 2 $Contains no trackers known to us \o/$ LastUpdate: 2015-03-13 Github; AES-256 encrypted notes
SimpleTextCrypt (0@0) 0 $Contains no trackers known to us \o/$ LastUpdate: 2015-12-29 Github
Encrypt Text (0@0) 0 $Contains no trackers known to us \o/$ Github

Various other encryption apps

2020-09-18

Cryptogram (4.7@809) 0 $Contains no trackers known to us \o/$ LastUpdate: 2012-05-31
Enigma Simulator (4.6@2,050) Ǥ 3 $Contains no trackers known to us \o/$ LastUpdate: 2017-07-14
Latebra cryptographic app (4.6@8) Ǥ 21 5 encrypt SMS/Email
Crypto - Tools for Encryption & Cryptography (4.4@631) Ǥ 12 2
TXTcrypt (4.4@79) 0 $Contains no trackers known to us \o/$ LastUpdate: 2016-06-28
Cryptogram Puzzle Quotes Game (4.3@1,485) Ǥ 5 3 LastUpdate: 2018-01-19
Kryptomat (4.3@27) 2 $Contains no trackers known to us \o/$ LastUpdate: 2014-08-14
Safe Notes is a secure notepad (4.2@5,191) 11 4
SEED Encryption App Free (4.2@18) 2 $Contains no trackers known to us \o/$ LastUpdate: 2014-06-20 / SEED Encryption App PRO (4@1; ~EUR 0.75) 0 $Contains no trackers known to us \o/$ LastUpdate: 2014-06-20
PGPClipper (4.1@11) 3 $Contains no trackers known to us \o/$ LastUpdate: 2018-12-12 Github
Oversec (4@218) Ǥ 4 $Contains no trackers known to us \o/$
Crypto - RSA encryption by Cronkhinator (4@19) 1 $Contains no trackers known to us \o/$
Enigma Trial - Cryptograms (3.2@182) 0 $Contains no trackers known to us \o/$ LastUpdate: 2017-12-09 / Enigma - Cryptograms (4.4@168; ~EUR 1.00) 0 $Contains no trackers known to us \o/$ LastUpdate: 2017-12-09
Encrypt Editor (3.2@33) 5 3
PixelKnot: Hidden Messages (2.6@1,113) 3 $Contains no trackers known to us \o/$ LastUpdate: 2017-02-19 Github; Details; Steganography (text hidden inside image, unlock with passphrase)
EnigmAndroid (0@0) 0 $Contains no trackers known to us \o/$ LastUpdate: 2019-01-03 Github; Enigma Simulation

Further Readings:

Category Encryption of Files and Folders
Category Messenger & Conferences

2020-09-25

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