doublenc

doublenc is a command-line utility designed for encrypting and decrypting files. It utilizes the NaCl (Networking and Cryptography library) library, specifically the `secretbox` primitive, to provide authenticated encryption. This means that both the confidentiality and integrity of the data are protected. When encrypting a file, doublenc generates a random nonce and prepends it to the ciphertext. During decryption, this nonce is used to verify that the ciphertext has not been tampered with.

The primary use case for doublenc is to securely share sensitive files. A user can encrypt a file with a passphrase, and then share the encrypted file along with the passphrase. The recipient can then use doublenc and the same passphrase to decrypt and access the original file. The tool is known for its simplicity and focus on a single, robust encryption scheme. It avoids many of the complexities and potential pitfalls found in older or more feature-rich encryption tools, making it a straightforward option for basic file encryption needs. doublenc is typically available on Unix-like systems and can be compiled from source. Its reliance on the well-regarded NaCl library lends it a degree of trust within the cryptographic community.