Question 30 Certification as a mean used for qualified e-signature PKI is... Not yet answered Select one: Marked out of 1 a. ... a stable and reliable binding of a AES-key of signer with the signable document using Vernam cipher b. is the same thing as taking time-stamp to a digital signature c. ... a stable and reliable binding of personal data (name and ID-code) of a future signer with his/her public key (as his/her public digital identity) which should be done before any signing d. ... a stable and reliable binding of e-signature with the personal data (name and ID-code) of a signer e. a stable and reliable binding of a signable document with the esignature using symmetric cryptoalgorithm Question 29 Cryptographic hash protects... Not yet answered Select one: Marked out of 1 a. ... only data confidentiality b. ... only data integrity c. ... both data confidentiality and integrity d. ... both data confidentiality and availability e. ... both data integrity and availability