5.4 Flashcards
_________ is a cryptographic mechanism that helps to achieve the security service Data integrity.
Hash Function
______ is values returned by a hash function.
Message Digest
_________ is a signature in digital form for an electronic document.
digital signature
_______ is a trusted entity that handles digital certificate.
Certificate Authority
T or F: Hash functions are hard to compute but easy to reverse.
false, easy to compute but hard to reverse.
A hash function __, applied on input (_), returns a fixed string ___.
H( ), (x), hs
How are Hash function mathematically written?
hs = H(x)
T or F: the hashes can be sent with the message.
true
A ________ is a one-way mathematical function that generates a fixed-length hash value based on the plain text.
Hash Function
What are the main security services achieved through cryptography?
confidentiality, integrity, and non-repudiation
T or F: Encryption is one of the core cryptographic mechanisms.
true
Cryptographic mechanisms such as ________ and hash functions are used to ensure the security service integrity.
digital signatures
Digital Certificates (Digital IDs) are used to achieve the access control component ________.
Authentication
the security service ________ prevents the sender from denying that he or she sent the message.
non-repudiation
T or F: Digital signatures achieve the security service Non-redpudiation.
true
