A secure and trusted time stamping authority

Author

Takura, Akira ; Ono, Satoshi ; Naito, Shozo

Author_Institution

NTT Software Labs., Tokyo, Japan

fYear

1999

fDate

1999

Firstpage

88

Lastpage

93

Abstract

A method to construct a secure and trusted time stamping authority is proposed to provide adequate precision and protection for digital time stamping of electronic digital documents. Time for stamping is obtained from a precise clock that is synchronous to two atomic clocks. A digital signature is obtained by using the RSA cryptosystem with 2048-bit modulus, and a secret key of a time stamping authority is stored at distributed servers partially. A ticket is used for screening illegal use. These features are crucial for operating a secure and trusted time stamping authority. A time stamping authority provides a “proof-of-existence” for digital documents at an instant in time. In electronic commerce a “proof-of-existence” is useful for preventing from forging transactions

Keywords

Internet; cryptography; document handling; electronic commerce; telecommunication security; Internet; RSA cryptosystem; atomic clocks; digital documents; digital signature; distributed servers; electronic commerce; proof-of-existence; secret key; trusted time stamping authority; Atomic clocks; Computer Society; Digital signatures; Electronic commerce; Global Positioning System; ISDN; Intellectual property; Protection; Public key cryptography; Synchronization;

fLanguage

English

Publisher

ieee

Conference_Titel

Internet Workshop, 1999. IWS 99

Conference_Location

Osaka

Print_ISBN

0-7803-5925-9

Type

conf

DOI

10.1109/IWS.1999.810997

Filename

810997