OneTime is described as 'Open source encryption program that uses the one-time pad algorithm to allow two parties to communicate privately. It has features to assist with the bureaucracy of pad management, and comes with built-in help. OneTime requires Python 2' and is an app in the security & privacy category. There are more than 25 alternatives to OneTime for a variety of platforms, including Windows, Mac, Linux, Android and OpenPGP apps. The best OneTime alternative is TrueCrypt, which is free. Other great apps like OneTime are GnuPG, GPG4Win, Kleopatra and Axcrypt.
[TrueCrypt is not exactly "Open Source", but the source is available. See the reviews to get more information.]
TrueCrypt is the most popular Windows, Mac & Linux alternative to OneTime.
TrueCrypt is the most popular free alternative to OneTime.
GnuPG allows to encrypt and sign your data and communication, features a versatile key management system as well as access modules for all kinds of public key directories. GnuPG, also known as GPG, is a command line tool with features for easy integration with other applications.
GnuPG is the most popular Open Source alternative to OneTime.
Gpg4win enables users to securely transport emails and files with the help of encryption and digital signatures. Encryption protects the contents against an unwanted party reading it. Digital signatures make sure that it was not modified and comes from a specific sender.
Offers robust file encryption with AES-256 for premium and AES-128 for free users, integrated password manager, intuitive interface, support for cloud storage, multilingual options, offline security, group management tools, and secure file deletion features.
Axcrypt is the most popular Android, iPhone & iPad alternative to OneTime.
Enigmail is a security extension to Mozilla Thunderbird and SeaMonkey. It enables you to write and receive email messages signed and/or encrypted with the .
Easily encrypt files with user-friendly software using the powerful AES standard for security on Windows, macOS, and Linux, featuring robust 256-bit encryption for safeguarding sensitive data from unauthorized access, ideal for secure data storage, email transmission, and internet uploads.
AES Crypt is the most popular Android Tablet alternative to OneTime.
AES Crypt is the most popular commercial alternative to OneTime.
Multron File Guardian - A File Encrypter/Decrypter With Many Encryption Algorithm.
Encrypto lets you encrypt files before sending them to friends or coworkers. Just drop a file into Encrypto, set a password, and then send it however you normally would — but this time with added security. It’s free for both Mac and Windows.
FreeOTFE is a free, open source, "on-the-fly" (OTFE) disk encryption program for PCs running MS Windows and Windows Mobile PDAs (FreeOTFE4PDA).
Platform-independent password-based authenticated encryption of files & folders.
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