An attestation letter is a statement or declaration from an independent third party that lends credibility to the part of the organization undergoing review. It is a written statement that confirms something is true or authentic. Attestation letters can take different forms depending on their purpose. Here are some examples:

• Executive Summary Report: This type of attestation letter is often required as part of an ongoing audit, which is in and of itself a type of attestation. It is a statement from an independent third party that lends credibility to a specific part of the organization undergoing review.

• Penetration Testing or Security Assessment Report: This type of attestation letter is provided to publicly validate that the organization performed well during said testing or review process. It confirms that after evaluating the security posture of the organizations infrastructure, network, applications, etc., the organization was adequately protected, with the appropriate controls and based on industry information security standards and regulations.

• Letter of Attestation for Practice Option: This type of attestation letter confirms that a diplomate was the position or job on a quality improvement project.

• Verification of Document or Signature: This type of attestation is the process through which a competent authority verifies the legitimacy of a document or signature. Typically, this is performed by a notary public, an attorney, or another authorized professional. The attestant compares the document or signature to the original, and then signs and stamps the document to attest that it is an accurate copy or that the signature is authentic.

Attestation letters are typically written as formal business letters. They should be formatted in a readable font, such as Times New Roman or Arial, and should include an introduction that explains who the writer is and their relationship to the subject of the letter. The letter should also include a summary of the purpose of the attestation and any applicable certifications. Finally, the letter should be sent to the recipient in their preferred method, which may be mail, email, or fax.