Negate certificate in xhtml

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Aug 6th, 2022
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How to negate certificate in xhtml

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We would like to add digital signatures to the course accomplishment certificates that would allow someone who knows KU,CA, the public key of our certificate authority, to validate that a certificate was generated by Udacity and earned by the person whose name is in the certificate. Assume m is the certificate string. For example, amp;quot;Certificate of accomplishment with highest distinction earned by Alice Hacker in CS587.amp;quot; Assume E is a strong public key encryption algorithm, H is a cryptographic hash function, and r si a random nonce. Which of these schemes would allow Udacity to generate unforgable, verifiable, signed certificates. Check all that are valid.

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You can either enter the URL of your web page, upload your HTML file, or paste your code directly into the validator. Once you choose your option, click on the Check button and wait for the results. The validator will show you a summary of the validation status, and a list of errors and warnings, if any.
In order to validate an XHTML document, a Document Type Declaration, or DOCTYPE, may be used. A DOCTYPE declares to the browser the Document Type Definition (DTD) to which the document conforms. A Document Type Declaration should be placed before the root element.
XHTML is considered obsolete.
Here are the rules to XHTML : XHTML documents must have a tags, tags, tags and tags. XHTML tag elements must always close; Either like XHTML tag elements must always be lowercase.
Every XHTML document is validated against a Document Type Definition. Before validating an XHTML file properly, a correct DTD must be added as the first or second line of the file. Once you are ready to validate your XHTML document, you can use W3C Validator to validate your document.
To preserve all the characters for some elements, use the xml:space attribute or the PRE element (only valid for XHTML documents). The possible values for the xml:space attribute are default and preserve . The value default means that an applications default white-space treatment is acceptable for these elements.
That is, the attribute alone is enough, so that when the attribute is set without a value, it counts as true. In XML-based languages, attribute minimization is disallowed and attributes must have a value; for example, in XHTML, checked is invalid, and must be written checked=checked .

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