Change default Redis keys for SecurityInfo storage

CONTRIBUTING.md

@@ -2,6 +2,6 @@
 
 If you plan to contribute to Leshan please take few minutes to read our [Contribution Guide](https://github.com/eclipse/leshan/wiki/How-to-contribute).
 
-If you are confortable with **java**, **maven**, **git** and **github PR flow**,  you can just read the [legal stuff](https://github.com/eclipse/leshan/wiki/How-to-contribute#legal-stuff-) and our [code&design guidelines](https://github.com/eclipse/leshan/wiki/Code-&-design-guidelines).
+If you are comfortable with **java**, **maven**, **git** and **github PR flow**, you can just read the [legal stuff](https://github.com/eclipse/leshan/wiki/How-to-contribute#legal-stuff-) and our [code&design guidelines](https://github.com/eclipse/leshan/wiki/Code-&-design-guidelines).
 
 Thanks a lot !

leshan-server-redis/src/main/java/org/eclipse/leshan/server/redis/RedisSecurityStore.java

@@ -35,8 +35,12 @@
 
 /**
  * A {@link SecurityStore} implementation based on Redis.
- *
- * Security info are stored using the endpoint as primary key and a secondary index is created for psk-identity lookup.
+ * <p>
+ * Security info are stored using the endpoint as primary key and a secondary index is created for endpoint lookup by
+ * PSK identity.
+ * <p>
+ * By default, uses {@code SEC#EP#} key prefix to find security info by endpoint and {@code EP#PSKID} key to get the
+ * endpoint by PSK ID. Leshan v1.x used {@code SEC#EP#} and {@code PSKID#SEC} keys for that accordingly.
  */
 public class RedisSecurityStore implements EditableSecurityStore {
 
@@ -49,7 +53,7 @@ public class RedisSecurityStore implements EditableSecurityStore {
     private final List<SecurityStoreListener> listeners = new CopyOnWriteArrayList<>();
 
     public RedisSecurityStore(Pool<Jedis> pool) {
-        this(pool, "SEC#EP#", "PSKID#SEC");
+        this(pool, "SEC#EP#", "EP#PSKID");
     }
 
     public RedisSecurityStore(Pool<Jedis> pool, String securityInfoByEndpointPrefix, String endpointByPskIdKey) {