Hashing and Digital Certificates

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What are some characteristics of hash functions?

Condenses arbitrary messages to fixed size, usually public and not keyed, used to detect changes to message, usually used to create digital signature

What are some of the commonly used hash algorithms?

MD5, SHA, SHA-1

What are some things that a certificate includes?

Name of Entity being Certified, Public key, Name of Certificate Authority, Serial Number, Expiration Date, Digital signature of the issuer

What are the different techniques for certificate dissemination?

Out-of-band, Public repositories, In-band, Issues

What is an example of chaining?

Passport having the seal of the government

What are some key issues in Key Pair Generation?

Performance, Assurance, Legal/Liabilities

What are the steps for issuing a digital certificate?

Registration, Key Pair Generation, Creation, Distribution

What is the subject name?

The entity whose public key is included in the certificate

Hash Functions can be applied to any sized message

True

Hash functions produce fixed-length output

True

What is industry standard certificate authority?

Verisign

What is a digital signature?

a data item which accompanies or is logically associated with a digitally encoded message

what is a message digest?

a fingerprint for a document

What are the two goals of digital signatures?

a guarantee of the source of the data, proof that the data has not been tampered with

what is a digital signature created with?

a persons private key

What is a digital signature verified with?

a persons public key

What is a digital certificate?

a signed statement by a trusted party that another party's public key to them

Who can start a certificate authority?

anyone

What is the valid time period?

begin time and end time

What is Chaining?

practice of signing a certificate with another private key that has a certificate public key

What is the subjects public key?

public key and public key method

what is the issuer name?

the entity whose private key signed the certificate

What is the signature method of a certificate?

the method used to sign the digital certificate

What is the purpose of the message digest?

to provide proof that a document has not been tampered with


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