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  • Main Subject - How Spammers Fool Rule-based and Signature-Based Spam Filters

    Effectively stopping spam over the long-term requires much more than blocking individual IP addresses and creating rules based on keywords that spammers typically use. The increasing sophistication of spam tools coup
    According to USFDA, a combination product is one composed of any combination of a drug and device; biological product and device; drug and biological product
    led with the increasing number of spammers in the wild has created a hyper-evolution in the variety and volume of spam. The old ways of blocking the bad guys just don’t work anymore.

    Examining spam and spam-blocking
    ; or drug, device, and biological product and fixed dose combination would include two or more combinations of drug.

    Examples of combination products may in
    technology can illuminate how this evolution is taking place and what can be done to combat spam and reclaim e-mail as the efficient, effective communication tool it was intended to be.

    Heuristics (Rule-based Filte
    lude drug-coated devices, drugs packaged with delivery devices in medical kits, and drugs and devices packaged separately but intended to be used together.

    ring)

    One method used to combat spam is Rule-based, or Heuristic Filtering. Rule-based filters scan email content for predetermined words or phrases that may indicate a message is spam. For example, if an email admi
    here is enormous increase in the number of combination products entering the market in the recent years. Combination products have proven advantages but fixe
    nistrator includes the word "sex" on a company’s rule-based list, any email containing this word will be filtered.

    The major drawback of this approach is the difficulty in identifying keywords that are consistently
    d dose combinations are still in the process of convincing regulatory authority on their advantages over the single ingredient formulations.

    Combination pro
    indicative of spam. While spammers may frequently use the words “sex” and ‘Viagra” in spam emails, these words are also used in legitimate business correspondence, particularly in the healthcare industry. Additionall
    ucts have become life saving products for the pharmaceutical companies who doesn’t have many innovative molecules in their product pipeline and have been inc
    y, spammers have learned to obfuscate suspect words by using spellings such as "S*E*X", or "VI a a GRR A".

    It is impossible to develop dictionaries that identify every possible misspelling of "spammy" keywords. Addi
    easingly used in the product life cycle management. Even the companies having product patents are trying to extend their product life cycle through the combi
    ionally, because filtering for certain keywords produces large numbers of false positives, many organizations have found they cannot afford to rely solely on rule-based filters to identify spam.

    Signature-Based Spam
    nation products and maximize the revenues. But the companies involved in this practice are overlooking that they are burdening the patients both economically
    Filters

    Another method used to combat spam is Signature-based Filtering. Signature-based filters examine the contents of known spam, usually derived from honey pots, or dummy email addresses set up specifically to
    and physically. They need to rightly judge the benefits of the combination products and they have to even look at the risks involved when combining the produ
    collect spam. Once a honey pot receives a spam message, the content is examined and given a unique identifier. The unique identifier is obtained by assigning a value to each character in the email. Once all character
    ts. Some of the combination products were well accepted by physicians while others suffered. Companies involved in development of combination products are fi
    s have been assigned a value, the values are totaled, creating the spam’s signature. The signature is added to a signature database and sent as a regular update to the email service’s subscribers. The signature is co
    ding difficulty in defining their combination products and facing various challenges from selecting a combination to marketing it.

    Following aspects would a
    mpared to every email coming in to the network and all matching messages are discarded as spam.

    The benefit of signature-based filters is that they rarely produce false-positives, or legitimate email incorrectly ide
    dd to the challenges in developing combination products:

    Which markets to tap where the combination products can do fairly well?
    Which combination prod
    ntified as spam. The drawback of signature-based filters is that they are very easy to defeat. Because they are backward-looking, they only deal with spam that has already been sent. By the time the honey pot receive
    cts are meaningful and rational?
    Which therapeutic categories to select?
    Which Combinations can address unmet needs of the patients?
    Do combin
    s a spam message, the system assigns a signature, and the update is sent and installed on the subscribers’ network, the spammer has already sent millions of emails. A slight modification of the email message will ren
    tions increase the patient compliance?
    What would be the developing cost?
    How to tackle the risks encountered during combination product developmen
    er the existing signature useless.

    Furthermore, spammers can easily evade signature-based filters by using special email software that adds random strings of content to the subject line and body of the email. Becaus
    t?

    As combination products don't fit into the traditional categories of drugs, medical devices, or biological products, the USFDA is in the process of devel
    e the variable content alters the signature of each email sent by the spammer, signature-based spam filters are unable to match the email to known pieces of spam.

    Developers of signature-based spam filters have lear
    ping new procedures for reviewing their safety, efficacy and quality.

    Professional from academic institutions, pharmaceutical industries, health care indust
    ned to identify the tell-tale signs of automated random character generation. But as is often the case, spammers remain a step ahead and have developed more sophisticated methods for inserting random content. As a re
    y and representatives from various regulatory agencies are working out to design the regulatory requirements for manufacture and sale of combination products
    sult, most spam continues to fool signature-based filters.

    The Solution

    When used individually, each anti-spam technique has been systematically overcome by spammers. Grandiose plans to rid the world of spam, such
    .

    As there is an increasing trend of the combination products companies manufacturing such products should be able to tackle the problems involved in the de
    as charging a penny for each e-mail received or forcing servers to solve mathematical problems before delivering e-mail, have been proposed with few results. These schemes are not realistic and would require a large
    elopment. They need to be wiser in analyzing the market trends and the regulatory requirements.

    Companies that provide selfless information through particip
    percentage of the population to adopt the same anti-spam method in order to be effective. You can learn more about the fight against spam by visiting our website at www.ciphertrust.com and downloading our whitepapers


    tion in industry events and feedback to regulatory authorities would be able to face the challenges and will be successful in developing combination products

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