Timestamps. GlobalSign offers three types of timestamps: AATL, SEIKO, and Qualified. A DSS or QTSeals Product Pack includes timestamps equal in number to two times the Quantity of Signatures or QTSeals (as applicable) purchased in the Product Pack. Additional timestamps may be purchased with a DSS Product Pack, a QTSeals Product Pack or as a standalone Product Pack.
Timestamps. Perhaps the most common use of timestamps in cryptographic protocols is to counteract replay and interleaving attacks, and to provide uniqueness or timeliness guarantees. In this sense, timestamps are an alternative to challenge-response mechanisms using fresh random nonce and to message sequence numbers. The typical operation of a system relying on timestamps is the following. Before sending a message, a party obtains a time reading from its local clock, and cryptographically binds it to the message for transmission. The receiver of the message obtains the current time from its own local clock, and subtracts the value of the timestamp received. The message is immediately rejected if the timestamp difference is outside a fixed-size time interval, called an acceptance window, selected to account for the maximum message transit and processing time, plus clock skew between the two parties. Furthermore, the receiver keeps a list of all previously received messages whose timestamps are still within the acceptance window. The incoming message is also checked against this list, and it is rejected if it is found to be a replay. The fact that the receiver must keep local state to detect the replay of valid time stamped messages within the acceptance window may also be considered a disadvantage. For example, a solution based on a challenge response mechanism using a random nonce could be used for the same purpose and would only require the receiver to keep a small amount of short-term state (albeit per-connection). In comparison to challenge response mechanisms, protocols using timestamps will typically require one less message to complete and will not require parties to generate random numbers. On the downside, the receiver must keep a small amount of ephemeral local state to detect the replay of valid messages within an acceptance window. The amount of state that must be kept when using timestamps can also be seen as an advantage when compared, for example, with solutions using sequence numbers where the receiver must keep static long-term state for each possible peer. In other application scenarios, there is no real alternative to the use of timestamps. Examples of this are the implementation of time- limited privileges, such as those awarded by Kerberos tickets, or the legal validity of authenticated documents, such as
Timestamps. <?xml version="1.0" encoding="UTF-8"?> <Logging_information> <Static_information> <User_Information> <user_ID>ID</user_ID> <legal_information> <name>Enter Name</name> <consent_form>Enter consent form</consent_form> <terms_and_conditions>Enter terms</terms_and_conditions> </legal_information> <pre_experimental_questionnaire> <gender>Male</gender> <age>24</age> </pre_experimental_questionnaire> <post_experimental_questionnaire> <subjective_quality>Enter values</subjective_quality> <qualitative_feedback>Enter feedback</qualitative_feedback> </post_experimental_questionnaire> </User_Information> <Setup_of_the_room> <condition>Enter condition</condition> <viewing_distance>Enter distance value</viewing_distance> </Setup_of_the_room> <Specifications_of_display_audio_devices_and_playback_software> <external_monitor> <display_size>Enter display size</display_size> <resolution>Enter resolution</resolution> <frame_rate>Enter frame rate</frame_rate> </external_monitor> <audio_device>Enter audio device type</audio_device> <immersive_display>Enter display type</immersive_display> <ambient_light_conditions> <Intensity>Enter Intensity</Intensity> <color_temperature>Enter temperature </color_temperature> </ambient_light_conditions> <software_version>Enter version</software_version> </Specifications_of_display_audio_devices_and_playback_software> <Content_identifiers_and_service_level_metadata> <codec_specifications>Enter specifications</codec_specifications> <channel_specifications> Enter specifications </channel_specifications> </Content_identifiers_and_service_level_metadata> </Static_information> <Dynamic_information> <Position_in_virtual_world>Enter position</Position_in_virtual_world> <Movement_acceleration>Enter acceleration</Movement_acceleration> <Viewport_field_of_view>Enter value</Viewport_field_of_view> <Audiovisual_monitoring> Enter position and action </Audiovisual_monitoring> <Frame_level_QoS_parameters> <instantaneous_bit_rate>Enter bit rate</instantaneous_bit_rate> <network_delay>Enter delay</network_delay> <packet_loss>Enter packet loss</packet_loss> <frame_rate>Enter frame rate</frame_rate> </Frame_level_QoS_parameters> <Timestamps>Enter Timestamps</Timestamps> </Dynamic_information> </Logging_information> Table 5: Example of an XML format of the logging information sent as input to the QoE module. The Implementation Plan of the QoE, depicted in Figure 15 involves four sub-modules as follows: INPUT DATA module, FEATURE EXTRACTION module, MODELING module a...
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Timestamps. The nature of OPC UA Historical Access requires that a single timestamp reference be used to relate the multiple data points or events, and clients may request which timestamp will be used as the reference. See [UA Part 4] for details on the TimestampsToReturn enumeration. An OPC UA Server supporting Historical Access will treat the various timestamp settings as described below. For HistoricalDataNodes: SOURCE Return the SourceTimestamp. SourceTimestamp is used to determine which historical data values are returned. SERVER Return the ServerTimestamp. ServerTimestamp is used to determine which historical data values are returned. BOTH Return both the SourceTimestamp and ServerTimestamp. SourceTimestamp is used to determine which historical data values are returned. NEITHER This is not a valid setting for any HistoryRead accessing HistoricalDataNodes. For HistoricalEventNodes: SOURCE Return the SourceTimestamp. SourceTimestamp is used to determine which historical events are returned. SERVER This is not valid setting for any HistoryRead accessing HistoricalEventNodes. BOTH This is not valid setting for any HistoryRead accessing HistoricalEventNodes. NEITHER This is not valid setting for any HistoryRead accessing HistoricalEventNodes. Any reference to Timestamps through out this specification will represent either ServerTimestamp or SourceTimestamp as dictated by the type requested in the ReadHistory service. Some servers may not support historizing both SourceTimestamp and ServerTimestamp, but it is expect that all servers will support historizing SourceTimestamp (see [UA Part 7] for details on Server Profiles).
Timestamps. When possible, ECOs shall cause to be applied Timestamps to individual CAD entries for the purposes of incident response data aggregation and review. Said Timestamps may include, but are not limited to:
Timestamps. GlobalSign offers three types of timestamps: AATL, SEIKO, and QTSA. A DSS Subscription includes timestamps equal in number to two times the Quantity of Signatures purchased in the Subscription. Additional timestamps may be purchased with a DSS Subscription or as a standalone Subscription.
