How to Qualify Electronic Signatures and Time Stamps

Abstract. In this work we will show how non-qualified electronic signatures and time stamps can be efficiently enhanced in order to equip them with similar features as qualified ones. In particular we will show how non-qualified electronic signatures can be used in business processes which require the written form. Furthermore we will show how to construct ”interval-qualified” (IQ) time stamps which may serve as cost efficient alternative to qualified time stamps issued by a trusted authority. An IQ time stamp issued at time ti is linked to two qualified time stamps issued at time T1 and T2, in a way that one is able to prove that T1 < ti < T2.

• Type: Conference
• Year: 2004
• Where: EUROPKI
• Authors: Detlef Hühnlein
• Keywords: EUROPKI 2004, Non-qualified Electronic Signatures, Qualified Time Stamps, Security Privacy, Time Stamps