2020年4月10日,苹果和谷歌宣布对联合开发的联系人跟踪协议的支持将出现在其iOS和Android操作系统的下一个更新中。
该项目的目的是通过跟踪接触链和及早发现新感染并随后进行快速隔离来减少冠状病毒的传播。

BLE(蓝牙低能耗)技术将用于跟踪联系人。
此联系人跟踪协议的操作原理如下:
iOS Android BLE- service UUID characteristic UUID.
, Bluetooth , Bluetooth- (characteristic UUID), , Apple & Google. .
Bluetooth service UUID characteristic UUID , , .
— , - , .
Bluetooth .
Trace Together 2020 .
, , , 909 , 29 , 74 16 .
1 , , BlueTrace, open-source.
Apple & Google
Apple & Google, BlueTrace, .
email, .
, 10 .
?
- 32- Tracing Key,
- 16- Daily Tracing Key.
HKDF:
dk = HKDF(tk , NULL, (UTF8("CT-DTK")||Di),16)
tk
— ,
Di
— , unix_timestamp div (60*60*24)
, div
—
||
NULL , , 16 — .
, .
10 * Rolling Proximity ID.
16 .
.
HMAC ( 16 ), , :
RPI = Truncate(HMAC(dk, (UTF8("CT-RPI")||Ti)),16)
dk
— ,
Ti
— ,
(unix_timestamp mod (60*60*24)) div (60*10)
, div
— , mod
—
*10 :
TimeIntervalNumber provides a number for each 10-minute window in a 24-hour window as defined by DayNumber)
bluetooth 15-20 , .
- RPI (Rolling Proximity ID) , .
14 , .
, , RPI RPI.
, .
Apple Google Contact Tracing Protocol, Rolling Proximity ID. , - , 14 .
.
Apple Google , , API.
Contact Tracing Framework.
, . Bluetooth .
, , «exposed».
: .
API , COVID-19, , Apple & Google .
14 , API.
:?
?
Apple App Store Google Play Market , COVID-19, . , , Contact Tracing Framework.
Apple Google , COVID-19.
, IT- .
Trace Together 1 , Apple Google .
.
, .
Apple Google, .
, , 100% , 3- .
Open-source
open-source Apple & Google, open-source .

open-source OpenCovidTrace, , Apple & Google, , iOS.
iOS
, Apple & Google, .
( advertising packets) BLE , 16 .
BLE UUID advertising info () BLE .
Core Bluetooth iOS , , BLE .
BLE : , .
, iOS Apple Core Bluetooth .
, Apple & Google, , Apple , .
, .
. - , - .
, .
Apple & Google .
, , , .
Geo- 14 Rolling Proximity ID’s , , .
Rolling Proximity ID’s GPS 14 .
, .
QR-, Bluetooth .
OpenCovidTrace , BlueTrace, Apple & Google, DP-3T, .
Github!
, .
OpenCovidTrace, .
, .
https://www.apple.com/covid19/contacttracing-Apple和Google协议文档https://www.tracetogether.gov.sg/-在新加坡启动的Trace Together应用程序的网站https://bluetrace.io/-技术网站Trace Together基于https ://opencovidtrace.org-我们的开源项目的站点https://github.com/OpenCovidTrace-Github上我们的存储库的站点https://github.com/DP-3T/-是另一个有希望的站点联系人交换协议