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Easy-Secure is a digital certificate-issuing authority (CA) - NSC Information Technology - Question 2 - 2017 - Paper 1
Question 2
Easy-Secure is a digital certificate-issuing authority (CA). Online traders can apply for a digital certificate. You need a program to test the validity of existing ... show full transcript
Worked Solution & Example Answer:Easy-Secure is a digital certificate-issuing authority (CA) - NSC Information Technology - Question 2 - 2017 - Paper 1
Step 1
Write code for a constructor method that will receive the name of the certificate holder, the expiry date, the security code and the issue number as parameters.
Answer
public TDigCertificate(String holder, String expiry, String security, int issue) {
this.certHolder = holder;
this.expiryDate = expiry;
this.securityCode = security;
this.issueNr = issue;
}
Step 2
Step 3
Write code for a method called resetExpiryDate that will reset the expiry date attribute of the digital certificate to the new expiry date of the digital certificate as set by the system date. Ensure that it is valid FOR ONE year.
Answer
public void resetExpiryDate() {
String newExpiry = $SysDate;
// Add 1 year to the current expiry date logic here
expiryDate = newExpiry;
}
Step 4
Step 5
Write code to complete the method called generateSecurityCode to compile a security code using randomly selected hexadecimal values.
Answer
public String generateSecurityCode() {
StringBuilder securityCode = new StringBuilder();
// Generate 10 random hex characters
for(int i = 0; i < 10; i++) {
securityCode.append("0123456789ABCDEF".charAt((int)(Math.random() * 16)));
}
// Insert 4 colons
for(int i = 0; i < 3; i++) {
securityCode.insert((i+1)*3, ':'); // Adds colons
}
return securityCode.toString();
}
Step 6
Write code to complete the given toString method that will return a string with attributes in the following format:
Answer
public String toString() {
return "Digital certificate information:\n" +
"Certificate holder: " + certHolder + "\n" +
"Expiry date: " + expiryDate + "\n" +
"Security code: " + securityCode + "\n" +
"Issue number: " + issueNr + ";";
}
Step 7
If the text file exists, search for the name of the certificate holder in the text file.
Answer
boolean found = false;
try {
BufferedReader reader = new BufferedReader(new FileReader("certificates.txt"));
String line;
while((line = reader.readLine()) != null) {
if(line.contains(certHolderName)) {
found = true;
break;
}
}
reader.close();
} catch (IOException e) {
// Handle error
}
Step 8