Avamprogetto 2a

Technical requirements for the handover interfaces for the execution of telecommunications surveillance

4.3.3.1.3 Message flow for email cancellation order processing for real-time interceptions

The following figure shows the message flow in case of a cancellation order.

CSP PTSS

Admin. Admin.

Function Function

Adm. Adm.

Cancellation Order

(e-mail)

Encryption: KCpub1 and KPpub1

Signed: KPpr11

Subject: Interception Type & reference

Content: XML (HI-1, Update Request, LITask)

+ Order form

Order reception confirmation

Encryption: KPpub1 and KCpub1

Signed: already signed

2 Subject: Re: Interception Type &

reference

Content: None

Confirmation of execution

Encryption: KPpub1

Signed: KCpr1

3 Subject: Re: Interception Type &

reference

Content: XML (HI-1, Update Response, LITask)

+ Order form

Acknowledgement of confirmation of execution

Encryption: KCpub1 and KPpub1

Signed: already signed4

Subject: Re: Re: Interception Type &

reference

Content: none

Used OpenPGP keys:

KPpub1 = public key from PTSS / KPpr1= private key from PTSS

KCpub1 = public key from CSP / KCpr1= private key from CSP

Figure 4-14: Message flow for email cancellation order processing for real-time interceptions

The PTSS may cancel an interception activation order that has already been sent to the CSP, as long as the CSP has not yet executed the order, i.e. for real-time interceptions if the interception was not yet activated in the CSP's systems.

In order to be effective, the cancellation order must be issued immediately by PTSS in order to avoid that the CSP activates the interception. For that purpose the PTSS must immediately contact the CSP by telephone and request the cancellation of the order. If the CSP confirms that the activation order can be cancelled then the initial cancellation request made by telephone must be promptly confirmed by PTSS in writing by sending a complete cancellation order to the CSP.