Digital Signature

Hassenstein Thema 4

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Kartei Details

Karten	33
Sprache	English
Kategorie	Informatik
Stufe	Universität
Erstellt / Aktualisiert	03.01.2019 / 31.01.2019
Lizenzierung	Keine Angabe
Weblink	https://card2brain.ch/box/20190103_digital_signature
Einbinden	<iframe src="https://card2brain.ch/box/20190103_digital_signature/embed" width="780" height="150" scrolling="no" frameborder="0"></iframe>

Flip-Modus

Recap: What do certificates provide?

- integrity

- authentication

- non-repudiation

Recap: Why are digital signatures important?

And what can be signed? (at least 3 answers)

- PDF, MS-Word

- XML docs

- emails

- image-/binary-files

Recap: Tell the 3 most common algorithms to create a digital signature?

- RSA

- DSA

- ECDSA

Recap: What part of a message is singed?

And which hashing algorithm family should be used?

- the message digest (rather than the message itself)

- SHA-2, SHA-3

Recap: What must a Digital Certificate include? (4 answers)

- bind public key to identity

- Path Validation up to root CA / Log Verification (CT-log)

- CP/CPS Policy (for what the cert should be used - ex. encryption, authentication or signing)

- Web Trust (http://www.webtrust.org/item64428.aspx) -->can provide assurance services to evaluate and test whether the services provided by a particular Certification Authority meet these principles and criteria.

CMS (Cryptographic Message Syntax) SignedData:

in which notation the CMS is presented?

what contains a cms signed message? (3 parts)

- ASN.1

- digital signature (encrypted hash)

- infromation about the signer (subject name

- serial number