Possible fix for #77 to use v4 UUID session_id as per RFC-4122.

Warning: NOT tested.

pubd/Cargo.toml

@@ -10,6 +10,7 @@ derive_more     = "^0.13"
 rand            = "^0.5"
 rpki            = "^0.5"
 serde           = { version = "^1.0", features = ["derive"] }
+uuid            = "0.7"
 
 [dependencies.krill_commons]
 path = "../commons"

pubd/src/lib.rs

@@ -6,6 +6,7 @@ extern crate rand;
 extern crate rpki;
 #[macro_use]
 extern crate serde;
+extern crate uuid;
 extern crate krill_commons;
 
 pub mod publishers;

pubd/src/repo.rs

@@ -34,10 +34,8 @@ pub struct RrdpInitDetails {
 
 impl RrdpInitDetails {
     pub fn init_new(base_uri: uri::Https, repo_dir: PathBuf) -> RrdpInit {
-        use rand::{thread_rng, Rng};
-        let mut rng = thread_rng();
-        let rnd: u32 = rng.gen();
-        let session = format!("{}", rnd);
+        use uuid::Uuid;
+        let session = format!("{}", Uuid::new_v4());
 
         StoredEvent::new(
             &id(),