There is a great article about Position-Based Quantum Cryptography at Science Daily.
The idea behind location-based cryptography is that only a recipient at a precise geographic location can receive an encrypted message, the location itself acts as the credential required for generating an encryption key.
This type of cryptography could be useful in several settings. For example, one could communicate with a military base with a guarantee that only someone physically present at the base will have access to the information. Furthermore, the location-based method eliminates the need for distributing and storing keys, one of the most difficult tasks in cryptography.
A central tool in location-based cryptography is secure location verification, which is a method for verifying the geographical position of a device in a secure manner, according to Rafail Ostrovsky, a UCLA professor of computer science and mathematics.
Read the full article at Science Daily.
[Source: Science Daily]