Kryptos
Encrypt inside any messenger: the keyboard encrypts, the screen decrypts
新版本 2.4
IMPORTANT: 2.4 is not compatible with older versions, both sides have to update.
Brazilian Portuguese. The language key is now a globe, hold it to switch keyboards. Comma key instead of emoji. New settings: vibration, key text size, key enlargement, automatic capitals. The cursor moves with a finger. Chats can go into the backup. Settings are stored encrypted. The keyboard and on-screen decryption lock 5 minutes after you leave. Libraries updated. Many fixes.
Brazilian Portuguese. The language key is now a globe, hold it to switch keyboards. Comma key instead of emoji. New settings: vibration, key text size, key enlargement, automatic capitals. The cursor moves with a finger. Chats can go into the backup. Settings are stored encrypted. The keyboard and on-screen decryption lock 5 minutes after you leave. Libraries updated. Many fixes.
Kryptos encrypts messages directly inside the chat, so you never have to switch between apps.
The Kryptos keyboard installs like any other system keyboard: enable it once, and it will be available everywhere you type. Write a message in WhatsApp, Telegram, or SMS, tap the lock icon, and the text in the input field is instantly replaced with ciphertext ready to send. Incoming messages are decrypted automatically, directly on top of the chat as you scroll, with no copying or app switching required. Both the keyboard and on-screen decryption are built into the system, so they work in any app.
Encryption: the Signal Protocol, powered by the official Signal libsignal library, a new key for every message, and protection against future quantum computers. Contacts can be verified using a safety code. If a full chat protocol is more than you need, there is a simple mode based on a shared password. PGP is also built in for users who rely on it. To the messenger, the encrypted message looks like nothing more than a meaningless string of characters with no recognizable markers.
Steganography hides the very fact that a message was written. Encrypted text can be hidden inside an ordinary photo or disguised as a harmless-looking sequence of real words. Without the password, the hidden content cannot be extracted from the image.
Nothing connects to the internet: the app contains no networking code. Kryptos requests only the permissions it needs for QR code scanning, vibration, and overlay functionality. No accounts, phone numbers, servers, or analytics. Keys are generated directly on the device, stored in Android’s secure keystore, and never leave it.
Access to the app can be protected with biometrics or a password. There is also a panic-wipe password: entering it into the same password field permanently deletes all stored data. The clipboard is cleared automatically, messages can be set to disappear after a timer, and screenshots and the app preview in the recent-apps screen can be blocked. All your keys can also be exported to a single password-protected file for transfer to a new phone.
Also included: light and dark themes, multiple app languages, a step-by-step guide with answers to frequently asked questions, emoji support, and fully offline autocorrect for English, Russian, German, and Persian, plus pinyin input for Chinese.
The Kryptos keyboard installs like any other system keyboard: enable it once, and it will be available everywhere you type. Write a message in WhatsApp, Telegram, or SMS, tap the lock icon, and the text in the input field is instantly replaced with ciphertext ready to send. Incoming messages are decrypted automatically, directly on top of the chat as you scroll, with no copying or app switching required. Both the keyboard and on-screen decryption are built into the system, so they work in any app.
Encryption: the Signal Protocol, powered by the official Signal libsignal library, a new key for every message, and protection against future quantum computers. Contacts can be verified using a safety code. If a full chat protocol is more than you need, there is a simple mode based on a shared password. PGP is also built in for users who rely on it. To the messenger, the encrypted message looks like nothing more than a meaningless string of characters with no recognizable markers.
Steganography hides the very fact that a message was written. Encrypted text can be hidden inside an ordinary photo or disguised as a harmless-looking sequence of real words. Without the password, the hidden content cannot be extracted from the image.
Nothing connects to the internet: the app contains no networking code. Kryptos requests only the permissions it needs for QR code scanning, vibration, and overlay functionality. No accounts, phone numbers, servers, or analytics. Keys are generated directly on the device, stored in Android’s secure keystore, and never leave it.
Access to the app can be protected with biometrics or a password. There is also a panic-wipe password: entering it into the same password field permanently deletes all stored data. The clipboard is cleared automatically, messages can be set to disappear after a timer, and screenshots and the app preview in the recent-apps screen can be blocked. All your keys can also be exported to a single password-protected file for transfer to a new phone.
Also included: light and dark themes, multiple app languages, a step-by-step guide with answers to frequently asked questions, emoji support, and fully offline autocorrect for English, Russian, German, and Persian, plus pinyin input for Chinese.
捐助
版本
雖然在下方可選擇下載 APK 檔案，但要留意這樣的安裝方式將不會收到更新通知，是一種較不安全的下載方法。建議您先安裝 F-Droid 用戶端使用。
下載 F-Droid-
arm64-v8aarmeabi-v7a此版本需要 Android 8.0 或更高的版本。
此套件包由原開發者建置和簽署，並保證與此原始碼 Tarball 保持一致。
-
arm64-v8aarmeabi-v7a此版本需要 Android 8.0 或更高的版本。
此套件包由原開發者建置和簽署，並保證與此原始碼 Tarball 保持一致。
-
arm64-v8aarmeabi-v7a此版本需要 Android 8.0 或更高的版本。
此套件包由原開發者建置和簽署，並保證與此原始碼 Tarball 保持一致。
新版本 2.3.3
Kryptos 2.3.3
New features
- Persian language
- Voice input has been added to the keyboard
- Keyboards have been adjusted to the system size. Larger letters, taller keys, wider spacing
- App lock has been redesigned
Bug fixes
- When launching Kryptos, it no longer contacts Google services to load the emoji font
- Re-adding a contact with the same saved key no longer permanently breaks the conversation in one direction
- Other fixes
New features
- Persian language
- Voice input has been added to the keyboard
- Keyboards have been adjusted to the system size. Larger letters, taller keys, wider spacing
- App lock has been redesigned
Bug fixes
- When launching Kryptos, it no longer contacts Google services to load the emoji font
- Re-adding a contact with the same saved key no longer permanently breaks the conversation in one direction
- Other fixes
新版本 2.3.2
Chinese: interface and a keyboard layout with pinyin input.
Rude and unsafe words are out of the text steganography dictionaries, still 4096 words per language. Covers made by the word and sentence modes cannot be read by versions before 2.3.2, both sides have to update.
Keyboard: bigger buttons, adjustable field size, the badge can be hidden.
Send after encrypting now works in messengers with their own send button.
Profiles and contacts can be renamed.
Around twenty fixes.
Rude and unsafe words are out of the text steganography dictionaries, still 4096 words per language. Covers made by the word and sentence modes cannot be read by versions before 2.3.2, both sides have to update.
Keyboard: bigger buttons, adjustable field size, the badge can be hidden.
Send after encrypting now works in messengers with their own send button.
Profiles and contacts can be renamed.
Around twenty fixes.