Microsoft excel encryption algorithm

A digit numerical password is stored in Active Directory and protected by Lockbox. AES external key is stored in a Secret Safe. The SharePoint Online Content Database is protected by database access controls and encryption at rest. These secrets are at the service level for SharePoint Online, not at the tenant level. These secrets sometimes referred to as the master keys are stored in a separate secure repository called the Key Store. TDE provides security at rest for both the active database and the database backups and transaction logs.

When customers provide the optional key, the customer key is stored in Azure Key Vault, and the service uses the key to encrypt a tenant key, which is used to encrypt a site key, which is then used to encrypt the file level keys. Essentially, a new key hierarchy is introduced when the customer provides a key. Each piece of data is encrypted using a different randomly generated bit key. The encryption key is stored in a corresponding metadata XML file, which is also encrypted by a per-conference master key.

The master key is also randomly generated once per conference. Each mailbox is encrypted using a data encryption policy that uses encryption keys controlled by Microsoft on roadmap or by the customer when Customer Key is used. Opportunistic TLS supporting multiple cipher suites.

TLS 1. Microsoft uses an internally managed and deployed certification authority for server-to-server communications between Microsoft datacenters. Managed by Microsoft.

Plan for Microsoft security and information protection capabilities. Top 10 ways to secure Microsoft for business plans. Microsoft Stream Video level encryption and playback flow. Skip to main content. This browser is no longer supported. Download Microsoft Edge More info. Contents Exit focus mode.

Is this page helpful? Please rate your experience Yes No. Any additional feedback? Submit and view feedback for This product This page. View all page feedback. In this article. Files on a device. These files can include email messages saved in a folder, Office documents saved on a computer, tablet, or phone, or data saved to the Microsoft cloud. Sometimes, old standards are deprecated as they become out of date and less secure.

This article describes currently supported cipher suites and other standards and details about planned deprecations. TLS, and SSL that came before TLS, are cryptographic protocols that secure communication over a network by using security certificates to encrypt a connection between computers. Office supports TLS version 1. Be aware that TLS versions deprecate, and that deprecated versions should not be used where newer versions are available. If your legacy services do not require TLS 1.

Office stopped supporting TLS 1. We have completed disabling TLS 1. We began disabling TLS 1. To maintain a secure connection to Office and Microsoft services, all client-server and browser-server combinations use TLS 1.

You might have to update certain client-server and browser-server combinations. For information about how this change impacts you, see Preparing for the mandatory use of TLS 1. This option is on by default in Office Excel and off by default in all other Office applications, and it is off by default in all applications in the Office system and newer versions. This option is on by default in Office Excel and off by default in all other Office applications, and it is off by default in all applications in the Office system, Office and Office This is stored encrypted within the element as follows.

It is possible to use alternate encryption algorithms, and for best results, a block cipher supporting ECB mode is recommended. Additionally, the algorithm ought to convert one block of plaintext to one block of encrypted data, where both blocks are the same size.

This information is for guidance only, and it is possible that if alternate algorithms are used, the applications in the Office system, Office and Office might not open the document properly or that information leakage could occur.

While an implementation is not required to use CryptoAPI, if an implementation is required to interoperate with the Office system, the Office system, Office and Office on the Windows XP operating system, Windows Vista operating system, Windows 7 operating system, Windows 8 operating system and Windows 8. Cryptographic service provider CSP : A library containing implementations of cryptographic algorithms.

Required AlgID values are specified in the remainder of this document. Required AlgIDHash values are specified in the remainder of this document.

For encryption operations, the hashing algorithm is fixed and cannot vary from the algorithms specified. The following cryptographic providers are recommended to facilitate interoperability across all supported versions of Windows:. An implementation needs to treat these providers as equivalent when attempting to resolve a CSP on a Windows system. The other providers listed support up to bit key lengths.