Abstract: Digital data sanitization is disclosed. An indication that a data sanitization process should be performed is received. The data sanitization process is performed. Performing the data sanitization process includes determining an amount of free space on a storage device. Performing the data sanitization process further includes performing a set of one or more write operations, where performing the write operations decreases the amount of free space on the storage of the device.

Abstract: The present disclosure describes techniques for storing encrypted files in a secure file repository and transferring those encrypted files to one or more recipients. A user selects a file to upload to a secure file repository. A secure collaboration app on the user's device generates a first encryption key that is used to encrypt the file. The encrypted file is then uploaded to the secure file repository, which provides the secure collaboration app with a random file name and a location of the encrypted file. The secure collaboration app updates locally stored metadata of the first encrypted file. To securely transfer the file, the user generates a second encryption key, encrypts the metadata with the second encryption key, and transmits the encrypted metadata to one or more receivers. The one or more receivers decrypt the encrypted metadata and use the decrypted metadata to retrieve the file and decrypt it.

Abstract: A public/private key pair is generated on a client device for an application. A device identifier for the client device is generated. An application identifier for the application is generated on the client device. At least one of the public key, the device identifier, and the application identifier are transmitted to a server.

Abstract: A variety of techniques for performing identity verification are disclosed. As one example, a verification request is received from a remote user. The verification request pertains to a cryptographic key. In response to receiving a confirmation from a local user of the local device, a verification process is initiated. A result of the verification process is transmitted to the remote user. As a second example, a verification request can be received at the local device, from a local user of the device. A verification process with respect to the local user is initiated, and a result of the verification process is transmitted to a remote user that is different from the local user.

Abstract: A pool of public keys, having a pool size, is received from a first device. The pool size reflects a target number of keys to be included in the pool. One of the received public keys included in the pool of keys is designated as a reserve key. A public key is selected from the pool of received public keys for use in conjunction with encrypting a communication to the first device. The selecting includes preferentially selecting a public key that is not designated as a reserve key, if at least one such key is present in the pool in addition to the reserve key. The size of the pool can be dynamically adjusted.

Abstract: A digital security bubble encapsulation is received from a sender. The encrypted digital security bubble encapsulation includes an encrypted message, an encrypted first key, and an identifier associated with an intended recipient. The encrypted digital security bubble encapsulation is decrypted. The received identifier and a device identifier are compared. The encrypted first key is decrypted in response to a determination that the identifier received in the digital security bubble encapsulation matches the device identifier. The encrypted message is decrypted using the first key.

Abstract: The secure messaging app described herein allows a user to create a secure social feed in order to share content with just a few friends or thousands of recipients. The user encrypts their content and then publishes the encrypted content to the secure social feed. Accordingly, only authorized recipients can decrypt and view the content. Furthermore, the user may administer the secure social feed to manage the addition and/or removal of users from the secure social feed. Further, the user periodically updates the parameters of the secure social feed to manage users' access to the feed.

Abstract: The present disclosure describes techniques for storing encrypted files in a secure file repository and transferring those encrypted files to one or more recipients. A user selects a file to upload to a secure file repository. A secure collaboration app on the user's device generates a first encryption key that is used to encrypt the file. The encrypted file is then uploaded to the secure file repository, which provides the secure collaboration app with a random file name and a location of the encrypted file. The secure collaboration app updates locally stored metadata of the first encrypted file. To securely transfer the file, the user generates a second encryption key, encrypts the metadata with the second encryption key, and transmits the encrypted metadata to one or more receivers. The one or more receivers decrypt the encrypted metadata and use the decrypted metadata to retrieve the file and decrypt it.

Abstract: The present disclosure describes techniques for storing encrypted files in a secure file repository and transferring those encrypted files to one or more recipients. A user selects a file to upload to a secure file repository. A secure collaboration app on the user's device generates a first encryption key that is used to encrypt the file. The encrypted file is then uploaded to the secure file repository, which provides the secure collaboration app with a random file name and a location of the encrypted file. The secure collaboration app updates locally stored metadata of the first encrypted file. To securely transfer the file, the user generates a second encryption key, encrypts the metadata with the second encryption key, and transmits the encrypted metadata to one or more receivers. The one or more receivers decrypt the encrypted metadata and use the decrypted metadata to retrieve the file and decrypt it.

Abstract: A variety of techniques for performing identity verification are disclosed. As one example, a verification request is received from a remote user. The verification request pertains to a cryptographic key. In response to receiving a confirmation from a local user of the local device, a verification process is initiated. A result of the verification process is transmitted to the remote user. As a second example, a verification request can be received at the local device, from a local user of the device. A verification process with respect to the local user is initiated, and a result of the verification process is transmitted to a remote user that is different from the local user.

Abstract: A digital security bubble encapsulation is disclosed. A first key and a device identifier of at least one recipient is requested from a first server. A message containing one or more components is encrypted using a second key. The second key is encrypted using the first key. The encrypted message, the encrypted second key, and the device identifier are encapsulated in a digital security bubble encapsulation. The digital security bubble encapsulation is transmitted to a second server.

Abstract: Techniques for determining whether to allow access to a calendar invite and a meeting are disclosed. In this regard, a calendar invite and meeting message are received from a sender. A first time-to-live (TTL) value and a second TTL value associated with the calendar invite and meeting, respectively, are determined. A determination is made that the first and second TTL values have not been exceeded and, if they have not, allowing access to the calendar invite and the meeting. However, when the TTL values have been exceeded, denying access to the calendar invite and the meeting.

Abstract: Techniques for determining whether to allow access to a calendar invite and a meeting are disclosed. In this regard, a calendar invite and meeting message are received from a sender. A first time-to-live (TTL) value and a second TTL value associated with the calendar invite and meeting, respectively, are determined. A determination is made that the first and second TTL values have not been exceeded and, if they have not, allowing access to the calendar invite and the meeting. However, when the TTL values have been exceeded, denying access to the calendar invite and the meeting.

Abstract: A public/private key pair is generated on a client device for an application. A device identifier for the client device is generated. An application identifier for the application is generated on the client device. At least one of the public key, the device identifier, and the application identifier are transmitted to a server.

Abstract: A digital security bubble encapsulation is disclosed. A first key and a device identifier of at least one recipient is requested from a first server. A message containing one or more components is encrypted using a second key. The second key is encrypted using the first key. The encrypted message, the encrypted second key, and the device identifier are encapsulated in a digital security bubble encapsulation. The digital security bubble encapsulation is transmitted to a second server.

Abstract: An automatic tactical light bar includes a body having a plurality of illuminated sides including at least a first illuminated side and a second illuminated side arranged around a central chamber; a plurality of illumination elements fixed to the illuminated sides with at least one illumination element per illuminated side; an electric circuit in communication with the illumination elements and the central chamber, the circuit including at least one orientation sensor; an electric power source in the central chamber and in communication with the plurality of illumination elements through the electric circuit, wherein the at least one orientation sensor controls one of plurality of illumination elements according to the electric circuit, wherein each of the at least one orientation sensors are arranged inside the body to selectively supply power to the at least one illumination elements corresponding to the first illuminated side.

Abstract: A digital security bubble encapsulation is disclosed. A public key and a device identifier of at least one recipient is requested from a first server. A message containing one or more components is encrypted using a symmetric key. The symmetric key is encrypted with a public key received in response to the request. The encrypted message, the encrypted symmetric key, and the device identifier are encapsulated in a digital security bubble encapsulation. The digital security bubble encapsulation is transmitted to a second server.

Abstract: A rotationally symmetric surgical instrument for use with a computer aided surgery system which is adapted so that it is easy to check its calibration and methods of checking the calibration of such instruments are described. The instrument includes a body having a working end which includes a working point which characterises the location in space of the working end. The instrument also has a location at which a marker can be attached to the instrument. Only a single formation is located toward the working end which provides a calibration reference point for engaging with a trackable instrument. The single formation has a fixed position relative to the working point. The position of the calibration reference point relative to the marker array can be determined so as to check whether the calibration of the instrument is still accurate.

Abstract: An audio visual homing marker includes a shock-resistant housing with a power supply, audio speaker and LED array inside the housing. A power switch is attached to the housing and the power supply. The housing includes a plurality of bulkheads that create a plurality of chambers. The power supply, the audio speaker and the LED array are each contained within separate chambers. The power switch is biased to the on position. The housing is a generally cylindrical polycarbonate structure and may be a transparent material. The LED array may include a plurality of LEDs attached around the perimeter of the housing. The audio speaker can be a siren or other loud speaker. The LED array may emit a visible or non-visible light. A variety of holders and dispensers make it easy to deploy the markers from a car or aircraft.

Abstract: A vehicle immobilization system has an electronically controlled locking mechanism which requires interconnection with an electrical supply for it to be switched between a locked state and an unlocked state. The locking mechanism remains in the state to which it is switched when disconnected from the electrical supply. The immobilization system includes control means which operates to connect the locking mechanism to the electrical supply to switch it from one state to the other, and to disconnect the locking mechanism from the electrical supply when the vehicle engine is running or the vehicle is moving. The immobilization system also includes means to prevent cranking of the engine when the locking mechanism is in it's locked state.