Abstract: According to an example, security indicator access determination may include determining a security indicator that is received from a first entity by a security indicator sharing platform for sharing with a second entity. A rule associated with identification of a third entity that has access to the security indicator may be analyzed. The third entity may be different from the second entity, and if the second entity belongs to a community, the third entity may not be in the community of the second entity. A determination may be made as to whether to identify the third entity based on the analysis of the rule. In response to a determination that the third entity is to be identified or not to be identified, the third entity may be identified to the first entity, or not identified to the first entity.

Abstract: Providing a targeted security alert can include collecting participant data from a plurality of participants within a threat exchange community, calculating, using a threat exchange server, a threat relevancy score of a participant among the plurality of participants within the threat exchange community using the collected participant data, and providing, from the threat exchange server to the participant, the targeted security alert based on the calculated threat relevancy score via a communication link within the threat exchange community.

Abstract: A method of establishing a secure channel between a human user and a computer application is described. A secret unique identifier (“PIN”) is shared between a user and an application. When the user makes a request that involves utilizing the PIN for authentication purposes, the application renders a randomly selected identifier. The randomly selected identifier is in a format that is recognizable to a human but is not readily recognizable by an automated agent. The randomly selected identifier is then presented to the human user. The user identifies the relationship between the randomly selected identifier and the PIN. If the user's input reflects the fact that the user knows the PIN, then the user is authenticated.

Abstract: Systems and methods are provided for authentication by combining a Reverse Turing Test (RTT) with password-based user authentication protocols to provide improved resistance to brute force attacks. In accordance with one embodiment of the invention, a method is provided for user authentication, the method including receiving a username/password pair associated with a user; requesting one or more responses to a first Reverse Turing Test (RTT); and granting access to the user if a valid response to the first RTT is received and the username/password pair is valid.

Abstract: According to an example, conditional security indicator sharing may include analyzing a security indicator that is received from a first entity by a security indicator sharing platform for sharing with a second entity. A determination may be made as to whether to share the security indicator with a third entity based on a condition. In response to a determination that the security indicator is to be shared or not to be shared with the third entity based on the condition, the security indicator may be respectively shared with the third entity, or not shared with the third entity.

Abstract: Example implementations relate to a security information sharing platform that enables sharing of security information among a plurality of members. For example, in an implementation, a system may determine that a first member of a community of a security information sharing platform is entitled access to a first set of encrypted information shared by a second member of the community. The system may also receive a request, from the first member, to access the first set of encrypted information, the request including a masked parameter. The system may also determine that the masked parameter matches an access parameter for accessing the first set of encrypted information and provide the first member access to the first set of encrypted information in response to determining that the masked parameter matches the access parameter.

Abstract: Systems and methods are provided for authentication by combining a Reverse Turing Test (RTT) with password-based user authentication protocols to provide improved resistance to brute force attacks. In accordance with one embodiment of the invention, a method is provided for user authentication, the method including receiving a username/password pair associated with a user; requesting one or more responses to a first Reverse Turing Test (RTT); and granting access to the user if a valid response to the first RTT is received and the username/password pair is valid.

Abstract: Example embodiments disclosed herein relate to determining threat scores for threat observables. Information about multiple threat observables are received from providing entities. The information about the threat observables include at least one attribute about a respective threat associated with the threat observable. Threat scores are determined for the respective threat observables for multiple entities. In one example, a first score of a first one of the threat observables is determined and is different than a second score of the first threat observable for a second entity based on a treatment of the attribute(s).

Abstract: Examples disclosed herein relate to data objects associated with private set intersection (PSI). Some examples disclosed herein may enable identifying a set of server elements and a set of data objects. Each data object of the set of data objects may be associated with at least one server element of the set of server elements. Some examples further enable sending the set of server elements and the set of data objects to a client computing device that has a set of client elements. A private set intersection (PSI) between the set of server elements and the set of client elements may be inaccessible by the client computing device, and a subset of the set of data objects that are associated with the PSI may be accessible by the client computing device.

Abstract: Examples disclosed herein relate to visualization of associations among data records in a security information sharing platform. Some examples may enable creating, in the security information sharing platform, an association between a first data record comprising a security indicator, and a second data record. Some examples may further enable providing a visual representation of the first data record, the second data record, and the association, wherein the first data record represents a first node in the visual representation, the second data record represents a second node in the visual representation, and the association represents an edge that connects the first node and the second node.

Abstract: Examples disclosed herein relate to generating communities on a security information sharing platform. Some examples may enable identifying a set of community attributes to be used to generate a community on the security information sharing platform that enables sharing of security information among a plurality of communities. Some examples may enable authorizing a first user to access community-based security information of the community where the first user is associated a set of user attributes that satisfy the set of community attributes. A security indicator may be obtained from the first user of the community. Information related to the security indicator may be obtained from a second user of the community. Some examples may enable including the security indicator and the information related to the security indicator in the community-based security information of the community.

Abstract: Examples disclosed herein relate to encryption of community-based security information. Some examples may enable authorizing a user of a community to access an encrypted data item (e.g., at least an encrypted portion of community-based security information of that community) using a decryption key. The community may be generated on a security information sharing platform based on a set of community attributes. The decryption key may comprise a private key corresponding to each user attribute of a set of user attributes that are associated with the authorized user where the set of user attributes satisfy the set of community attributes.

Abstract: Examples disclosed herein relate to strength of associations among data records in a security information sharing platform, Some examples may enable creating, in the security information sharing platform, an association between a security indicator comprising an observable, and a data record. Some examples may further enable determining strength of the association between the security indicator and the data record based on at least one of: a likelihood of change in the association; a creator of the association; an aging rate of the association; or a quality of evidence that supports the association.

Abstract: Examples disclosed herein relate to sharing of community-based security information. Some examples may enable generating a first community on a security information sharing platform that enables sharing of security information among a plurality of communities; obtaining a first security indicator from a first user of the first community; providing the first security indicator to the first community; obtaining contextual information related to the first security indicator from a second user of the first community; including the first security indicator and the contextual information related to the first security indicator in the security information of the first community; and encrypting a portion of the security information of the first community with an encryption key, wherein the encryption key is unavailable to users outside of the first community.

Abstract: In one example in accordance with the present disclosure, a method for threat score determination includes detecting a change in malicious activity for a security object. The method also includes identifying an indicator that provides contextual information for the security object and determining a linked resource that is associated with a database record of the security object. The method also includes determining a first threat score associated with the security object and determining a relationship between the linked resource and the security object. The method also includes determining a second threat score associated with the linked resource based on the indicator, the threat score of the linked object and the relationship between the linked resource and the security object.

Abstract: Examples of implementations relate to privacy preservation in a security information sharing platform. For example, a system of privacy preservation comprises a physical processor that executes machine-readable instructions that cause the system to compare, in a security information sharing platform that enables sharing of security information among a plurality of users, a set of profiles wherein each profile is associated with an individual user; identify, based on the comparison, a profile element of a particular profile that is predictive of an identity of a user associated with the particular profile; and provide information about the profile element to the user of the particular profile.

Abstract: Systems and methods are provided for authentication by combining a Reverse Turing Test (RTT) with password-based user authentication protocols to provide improved resistance to brute force attacks. In accordance with one embodiment of the invention, a method is provided for user authentication, the method including receiving a username/password pair associated with a user; requesting one or more responses to a first Reverse Turing Test (RTT); and granting access to the user if a valid response to the first RTT is received and the username/password pair is valid.

Abstract: Example embodiments disclosed herein relate to update a rating of threat submitters. Information is received of threat observables from threat submitters. Information about the threat observables is provided to one or more entities. Feedback about a threat observable is received from one of the entities. A rating of the threat submitter associated with the feedback is updated.

Abstract: Example implementations relate to performance tracking in a security information sharing platform. For example, the security information sharing platform may enable sharing of security information among a plurality of users. A method of performance tracking in the security information sharing platform may include monitoring user behavior in the security information sharing platform, comparing the user behavior against a plurality of performance objectives in the security information sharing platform, and assigning a badge to a user among the plurality of users, for achievement of a performance objective among the plurality of performance objectives, based on the comparison.

Abstract: Updating ground truth data in a security management platform is disclosed. One example is a system including at least one processor and a memory storing instructions executable by the at least one processor to receive, in a security management platform, event data relating to a plurality of events corresponding to operation of a computing arrangement in a current time interval, and computing ground truth data for the current time interval based on the received event data, and threat intelligence data from time intervals preceding the current time interval. A prediction model is applied to generate predictions for the current time interval based on the received event data. Ground truth data is re-computed for the time intervals preceding the current time interval based on a comparison of the generated predictions and the computed ground truth data.