Supporting a versioning of parameters

An apparatus comprising at least one processor and at least one memory including computer program code, the at least one memory and the computer program code configured to, with the at least one processor, cause an apparatus at least to perform:

• extract from radio signals, transmitted by a positioning support device and received by a mobile device, data enabling a determination of characteristics of radio signals transmitted by the positioning support device, the characteristics expected to be observable at different locations, wherein the data is at least partially encrypted using an encryption key that is associated with a particular version of a set of values of parameters that was used in assembling the data, wherein the at least partially encrypted data comprises an error detecting code value;
• attempt to decrypt the at least partially encrypted data using at least one encryption key that is accessible to the apparatus;
• determine whether the decryption with a used encryption key was successful based at least in part upon the error detecting code;
• and
• if it is determined that the decryption was successful, select a version of a set of values of parameters that is associated with the encryption key.

A non-transitory computer readable storage medium, in which computer program code is stored, wherein the computer program code is configured, upon execution, to cause an apparatus to:

• extract from radio signals, transmitted by a positioning support device and received by a mobile device, data enabling a determination of characteristics of radio signals transmitted by the positioning support device, the characteristics expected to be observable at different locations, wherein the data is at least partially encrypted using an encryption key that is associated with a particular version of a set of values of parameters that was used in assembling the data, wherein the at least partially encrypted data comprises an error detecting code value;
• attempt to decrypt the at least partially encrypted data using at least one encryption key that is accessible to the apparatus;
• determining whether the decryption with a used encryption key was successful based at least in part upon the error detecting code;
• and
• if it is determined that the decryption was successful, selecting a version of a set of values of parameters that is associated with the encryption key.

A method comprising, performed by at least one apparatus:

• extracting from radio signals, transmitted by a positioning support device and received by a mobile device, data enabling a determination of characteristics of radio signals transmitted by the positioning support device, the characteristics expected to be observable at different locations, wherein the data is at least partially encrypted using an encryption key that is associated with a particular version of a set of values of parameters that was used in assembling the data, and wherein the at least partially encrypted data on a radio image comprises at least one of:
• a non-encrypted error detection code value;
• and/or
• a non-encrypted error detection code value in the form of a cyclic redundancy check value;
• and/or
• a non-encrypted error detection code value for the encrypted part of the at least partially encrypted data before encryption and/or;
• a non-encrypted error detection code value for the encrypted part of the extracted data and a non-encrypted part of the extracted data and/or;
• a non-encrypted identification of the positioning support device and/or;
• a non-encrypted indication of an image offset compared to an origin and/or;
• a non-encrypted indication of an image size and/or;
• an encrypted indication of an origin and/or;
• encrypted selected frequency values of a frequency transform of a radio image representing the characteristics of radio signals expected to be observable at different locations;
• and/or
• encrypted selected and compressed frequency values of a frequency transform of a radio image representing the characteristics of radio signals expected to be observable at different locations;
• attempting to decrypt the at least partially encrypted data using at least one encryption key that is accessible to the apparatus;
• determining whether the decryption with a used encryption key was successful;
• and
• if it is determined that the decryption was successful, selecting a version of a set of values of parameters that is associated with the encryption key.

An apparatus comprising at least one processor and at least one memory including computer program code, the at least one memory and the computer program code configured to, with the at least one processor, cause an apparatus at least to perform:

• extract from radio signals, transmitted by a positioning support device and received by a mobile device, data enabling a determination of characteristics of radio signals transmitted by the positioning support device, the characteristics expected to be observable at different locations, wherein the data is at least partially encrypted using an encryption key that is associated with a particular version of a set of values of parameters that was used in assembling the data, and wherein the at least partially encrypted data on a radio image comprises at least one of:
• a non-encrypted error detection code value;
• and/or
• a non-encrypted error detection code value in the form of a cyclic redundancy check value;
• and/or
• a non-encrypted error detection code value for the encrypted part of the at least partially encrypted data before encryption and/or;
• a non-encrypted error detection code value for the encrypted part of the extracted data and a non-encrypted part of the extracted data and/or;
• a non-encrypted identification of the positioning support device and/or;
• a non-encrypted indication of an image offset compared to an origin and/or;
• a non-encrypted indication of an image size and/or;
• an encrypted indication of an origin and/or;
• encrypted selected frequency values of a frequency transform of a radio image representing the characteristics of radio signals expected to be observable at different locations;
• and/or
• encrypted selected and compressed frequency values of a frequency transform of a radio image representing the characteristics of radio signals expected to be observable at different locations;
• attempt to decrypt the at least partially encrypted data using at least one encryption key that is accessible to the apparatus;
• determine whether the decryption with a used encryption key was successful;
• and
• if it is determined that the decryption was successful, select a version of a set of values of parameters that is associated with the encryption key.

A non-transitory computer readable storage medium, in which computer program code is stored, wherein the computer program code is configured, upon execution, to cause an apparatus to:

• extract from radio signals, transmitted by a positioning support device and received by a mobile device, data enabling a determination of characteristics of radio signals transmitted by the positioning support device, the characteristics expected to be observable at different locations, wherein the data is at least partially encrypted using an encryption key that is associated with a particular version of a set of values of parameters that was used in assembling the data, and wherein the at least partially encrypted data on a radio image comprises at least one of:
• a non-encrypted error detection code value;
• and/or
• a non-encrypted error detection code value in the form of a cyclic redundancy check value;
• and/or
• a non-encrypted error detection code value for the encrypted part of the at least partially encrypted data before encryption and/or;
• a non-encrypted error detection code value for the encrypted part of the extracted data and a non-encrypted part of the extracted data and/or;
• a non-encrypted identification of the positioning support device and/or;
• a non-encrypted indication of an image offset compared to an origin and/or;
• a non-encrypted indication of an image size and/or;
• an encrypted indication of an origin and/or;
• encrypted selected frequency values of a frequency transform of a radio image representing the characteristics of radio signals expected to be observable at different locations;
• and/or
• encrypted selected and compressed frequency values of a frequency transform of a radio image representing the characteristics of radio signals expected to be observable at different locations;
• attempt to decrypt the at least partially encrypted data using at least one encryption key that is accessible to the apparatus;
• determining whether the decryption with a used encryption key was successful;
• and
• if it is determined that the decryption was successful, selecting a version of a set of values of parameters that is associated with the encryption key.