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| Code Block |
|---|
"evaluable": true,
"responseDeclaration": {
"response1": {
"maxScore": 1,
"cardinality": "single",
"type": "integer",
-- To be Trimmed off ----
"correctResponse": {
"value": "0",
"outcomes": {
"SCORE": 1
}
},
-- To be Trimmed off --
#Newly Introduced Attribute
"responseKey": ["#Computed Hash/Encrypted Value of the resultcorrectResponse"]
}
}, |
Question Create API:
It is possible to permanently mark the question to be “evaluable“ in nature. Any evaluable question would automatically qualify for evaluable question Set. These Questions can be part of Evaluable QuestionSet only. Question Read of Evaluable Questions should exhibit the behaviour mentioned above.
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| Code Block |
|---|
{
"request": {
"userId": "843a9940-720f-43ed-a415-26bbfd3da9ef",
"questionSetDigest": "",
"assessments":[
{
"assessmentTs": 1681284869464,
"batchId": "0132677340746629120",
"collectionId": "do_213267731619962880127",
"userId": "843a9940-720f-43ed-a415-26bbfd3da9ef",
"attemptId": "5486724f41afb4997118e6d97695684f",
"contentId": "do_2129959063404544001107"
},
"events":[],
responses:[{
"identifier":"<question-id>",
"questionType": "",
"userResponse":[""],
"responseDeclaration": {},
"responseKey":["<response-key>"]
}]
}],
"contents": [
{
"contentId": "do_2132671468826214401203",
"batchId": "0132677340746629120",
"status": 2,
"courseId": "do_213267731619962880127",
"lastAccessTime": "2023-04-12 12:56:45:687+0530"
},
]
}
} |
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Question Set Response Processing flow
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Question Set Response Processing Hardening
In Order to minimise the possiblity of Exam Response replays or any other kind of malpractices. Following design enhancement is proposed.
Usage of QuestionSetDigest:
A Hash value of “user-id+questionsetid+timestamp“ is generated as questionSetDigest and sent to client as part of Question Hierarchy.
Same Digest is used in QuestionValidation API request payload to validate the userID and questionSetID tampering.
...
QuestionList Validation
In order to check for validity of Question inside a QuestionSet. Design proposes the value to be encrypted based on QuestionID List in hierarchy and persist this information against QuestionSetDigest in Redis.
| Code Block | ||||
|---|---|---|---|---|
| ||||
console.time("dbsave");
var crypto = require('crypto');
var encryptList = [];
var string = "sdgxsoksgdaodjqwdhuwdh";
var count = 0;
var salt = "salty";
for(var i=0;i<1000000;i++) {
var encrypt = crypto.pbkdf2('secret'+i, salt, 10, 64, 'sha512', (err, derivedKey) => {
if (err) throw err;
});
encryptList.push(encrypt);
if(string === encrypt) {
count++;
}
}
console.log(count);
console.log(encryptList.length);
console.timeEnd("dbsave"); |
...