US Patent 9614668 Conversion schemes for cryptography systems

In a general aspect, a conversion scheme is used with a cryptographic system. In some aspects, a pad bit vector is generated based on a size of a message bit vector, and a record bit vector is generated based on the pad bit vector. The record bit vector indicates the size of the pad bit vector. The record bit vector, the message bit vector, and the pad bit vector are combined to yield a first bit vector. A hash function is applied to the first bit vector, and an encryption function is applied to a portion of the first bit vector. A ciphertext is generated based on the output of the hash function and the output of the encryption function.