Abstract: The present disclosure relates to the field of synchronising a radio frequency (RF) communication system based on the repeated transmission of data at the transmitter and the use of a method for the time synchronous averaging of this data at the receiver. The proposed communication technique uses the fact that the data signal is periodically repeated, without requiring the use of synchronisation data external to the data to be communicated. It enables phase and frequency synchronisation to be maintained when the received signals are very noisy, and even when they have a signal-to-noise ratio of less than 1 or even a negative signal-to-noise ratio (in dB). A significant improvement in the processing gain of the method for time synchronous averaging is advantageously achieved.

Abstract: An email request is received from a client device, where the email request is intended for an email server and includes a request for an email recipient's certificate. The compliance status of the client device is obtained. If the client device is in compliance, the email request is modified, and the modified email request is sent to the email server while a certificate retrieval request in the email request is redirected to a certificate repository implemented in a server separate from a certificate repository maintained by the email server. The email certificate is retrieved from the certificate repository and combined with information received from the email server to generate a response, which is sent to the client device.

Abstract: An email request is received from a client device, where the email request is intended for an email server and includes a request for an email recipient's certificate. The compliance status of the client device is obtained. If the client device is in compliance, the email request is modified, and the modified email request is sent to the email server while a certificate retrieval request in the email request is redirected to a certificate repository implemented in a server separate from a certificate repository maintained by the email server. The email certificate is retrieved from the certificate repository and combined with information received from the email server to generate a response, which is sent to the client device.

Abstract: An email request is received from a client device, where the email request is intended for an email server and includes a request for an email recipient's certificate. The compliance status of the client device is obtained. If the client device is in compliance, the email request is modified, and the modified email request is sent to the email server while a certificate retrieval request in the email request is redirected to a certificate repository implemented in a server separate from a certificate repository maintained by the email server. The email certificate is retrieved from the certificate repository and combined with information received from the email server to generate a response, which is sent to the client device.

Abstract: An email request is received from a client device, where the email request is intended for an email server and includes a request for an email recipient's certificate. The compliance status of the client device is obtained. If the client device is in compliance, the email request is modified, and the modified email request is sent to the email server while a certificate retrieval request in the email request is redirected to a certificate repository implemented in a server separate from a certificate repository maintained by the email server. The email certificate is retrieved from the certificate repository and combined with information received from the email server to generate a response, which is sent to the client device.

Abstract: The invention relates to a device for the radio transmission of a data word between a transmitter (1) and a receiver (65), comprising a transmitter (1) that can transmit at least one block of data comprising a preamble word and a data word repeated several times; an elementary synchronization block allowing the synchronization of the receiver (65) to the transmitter (1) and the detection of the preamble word; and a synchronous averaging device (67) calculating the average of the data word repeated.

Abstract: The invention relates to a device for the radio transmission of a data word between a transmitter (1) and a receiver (65), comprising a transmitter (1) that can transmit at least one block of data comprising a preamble word and a data word repeated several times; an elementary synchronisation block allowing the synchronisation of the receiver (65) to the transmitter (1) and the detection of the preamble word; and a synchronous averaging device (67) calculating the average of the data word repeated.

Abstract: This device for sending binary data (ci) at radio frequency in a transmission channel comprises: a signal generator designed to generate, for each binary data item (ci), a pulsed signal (pi) of duration shorter than the duration of said binary data item (ci); means of multiplication of said pulsed signal (pi) by at least one periodic signal of variable frequency (fj) specific to said sending device, said variable frequency (fj) being greater than the frequency of said pulsed signal (pi); and means of sending the pulsed signal (pi.fj) resulting from said multiplication.