The claimed subject matter includes techniques for storing, retrieving and sharing files. An example system includes a key generator module to generate a secret key. The example system also includes a symmetric encryption module to encrypt raw data by symmetric encryption using the secret key. The example system further includes an asymmetric encryption module to encrypt the secret key and symmetric encryption information by asymmetric encryption using a public key to produce a key block. The examples system also further includes a schema module to generate a ciphertext file with predefined schema including asymmetric encryption information, the key-block, and the encrypted raw data. The example system also includes a storage module to send the ciphertext file including the encrypted raw data to a server for storage.