Cryptography using varying sized symbol sets

A system for symmetric cryptography using varying sized symbol sets, the system comprising:

• a transmitting device configured to perform operations comprising:
• accessing a first symmetric key and a first cryptography configuration data item corresponding to the first symmetric key, the first cryptography configuration data item identifying at least a first symbol set including a first number of unique symbols and a second symbol set including a second number of unique symbols, the first number being different than the second number;
• encrypting a data item with the first symmetric key according to the first cryptography configuration data item, yielding an encrypted data item, wherein encrypting the first data item comprises:
• encrypting a first portion of the data item based on the first symbol set;
• and
• encrypting a second portion of the data item based on the second symbol set;
• and
• transmitting the encrypted data item to a receiving device that has been allocated the first symmetric key and the first cryptography configuration data item, the receiving device decrypting the encrypted data item with the first cryptography configuration data item according to the first cryptography configuration data item.

A machine-readable medium storing instructions that, when executed by one or more computer processors of a transmitting device, cause the transmitting device to perform operations for symmetric cryptography using varying sized symbol sets, wherein the instructions, the instructions comprising:

• accessing a first symmetric key and a first cryptography configuration data item corresponding to the first symmetric key, the first cryptography configuration data item identifying at least a first symbol set including a first number of unique symbols and a second symbol set including a second number of unique symbols, the first number being different than the second number;
• encrypting a data item with the first symmetric key according to the first cryptography configuration data item, yielding an encrypted data item, wherein encrypting the first data item comprises:
• encrypting a first portion of the data item based on the first symbol set;
• and
• encrypting a second portion of the data item based on the second symbol set;
• and
• transmitting the encrypted data item to a first receiving device that has been allocated the first symmetric key and the first cryptography configuration data item, the first receiving device decrypting the encrypted data item with the first cryptography configuration data item according to the first cryptography configuration data item.