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Which of the following would have assured that the bid …

Company A submitted a bid on a contract to do work for Company B via email. Company B was insistent that
the bid did not come from Company A. Which of the following would have assured that the bid was submitted
by Company A?

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A.
Steganography

B.
Hashing

C.
Encryption

D.
Digital Signatures

Explanation:
A digital signature is similar in function to a standard signature on a document. It validates the integrity of the
message and the sender. The message is encrypted using the encryption system, and a second piece of
information, the digital signature, is added to the message.

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One Comment on “Which of the following would have assured that the bid …

  1. meac says:

    So company B claims that company A never sent an email but says that the bod never actually come from Company A.
    So the message was
    1) Sent by company A
    2) Received by company B
    3) Yet company B challenges the fact that it was company A which in fact sent the bid

    So we are looking on here at the principle of non-repudiation.

    First, let’s start with a process of Elimination:

    A) Steganography would further hide the message. It makes no sense as it only makes matters worse. Why would anyone send a bid hidden inside an image?
    B) Hashing deals with the integrity of the message, but it does not guarantee of delivery and of non-repudiation
    C) Encryption protects the message but it does not guarantee proof of delivery or non-repudiation

    Only D-Digital signatures are a form of proof of delivery
    Digital Signatures
    **A digital signature is used to introduce the qualities of uniqueness and non-deniability to internet communications. Each certificate is digitally signed by a trusted Certificate Authority or CA, and its hash value is encrypted with a private key also held by that same trusted CA.
    **A digital signature is similar in function to a standard signature on a document. It validates the integrity of the message and the sender. The message is encrypted using the encryption system, and a second piece of information, the digital signature, is added to the message.




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