Internet of Things (IoT) is very attractive because of its promises. However, it brings many challenges, mainly issues about privacy preserving and lightweight cryptography. Many schemes have been designed so far but none of them simultaneously takes into account these aspects. In this paper, we propose an efficient ABC scheme for IoT devices. We use ECC without pairing, blind signing and zero knowledge proof. Our scheme supports block signing, selective disclosure and randomization. It provides data minimization and transactions' unlinkability. Our construction is efficient since smaller key size can be used and computing time can be reduced. As a result, it is a suitable solution for IoT devices characterized by three major constraints namely low energy power, small storage capacity and low computing power.

No abstract

Arteriovenous malformations (AVM) have a wide range of clinical presentations. Operative bleeding is one of the most hazardous complications in the surgical management of high-flow vascular malformations. In the cervical region, the presence of vital vascular structures, such as the carotid artery and jugular vein, may increase this risk. This is a case of massive arteriovenous malformation deforming the neck and the face aspect of this aged lady and growing for several years. A giant mass of the left neck occupied the carotid region and the subclavian region. The AVM was developed between the carotid arteries, jugular veins, and vertebral and subclavian vessels, with arterial and venous flux. The patient underwent surgery twice for the cure of that AVM. The first step was the ligation of the external carotid. Seven days later, the excision of the mass was done. In postoperative period the patient presented a peripheral facial paralysis which completely decreased within 10 days. The first ligation of the external carotid reduces significantly the blood flow into the AVM. It permitted secondarily the complete ablation of the AVM without major bleeding even though multiple ligations were done.

Penetrating heart injuries cause wounds in the cardiac chambers. Most of them are due to gunshot or stabbing by knives. Screwdriver is an uncommon weapon. Authors report a case of stab wound by screwdriver, treated at cardiovascular center in Dakar. This is a 16-year-old boy who experienced physical aggression. He was assaulted with a screwdriver and had stab wound on the anterior wall of the chest. Physical examination showed a screwdriver penetrating the sternum bone over a right angle. He had a mild pericardial blood effusion and a right ventricle wound 5 mm in diameter with transection of the right coronary vein. The screwdriver was removed without cardiopulmonary bypass (CPB) and the ventricle wound repaired by direct suture of stitches reinforced with Teflon pledgets. The right coronary artery was ligated. Postoperative period was free of events. Screwdriver is uncommonly used as a weapon. It is a dangerous device because of its rigid structure and narrow tip.

The diagnosis of venous insufficiency is increasing. Multiple techniques are available for its treatment. Chemical sclerotherapy has been performed for over 70 years. The technique improves lately. Objective: This study was conducted to assess early results of foam sclerotherapy in Senegal. Patients and Methods: This is a prospective and descriptive study conducted from January 1 st , 2012 to December 31 st , 2015 at cardiovascular center of Fann University hospital in Dakar, Senegal. Foam sclerotherapy was done in 76 patients. Polidocanol was used in concentration of 2%. Sclerotherapy was done several times in patients, every week, as much as needed to occlude varicose veins. We used venous compression in all patients. Results: Foam sclerotherapy sessions permitted to get globally good results. In fact, tight feeling and painful leg disappear in 97% of patients. Decreases of edema were gotten in 97% of patients. For leg ulcer, 64% of complete healing was obtained. The main ulcer healing time was 47 days (18; 72). Some minor complications occurred. No major events, such as deep venous thrombosis or pulmonary embolism, were observed. Conclusion: Foam sclerotherapy is an efficient technique for the treatment of varicose veins of the limbs. Also, it opens good perspectives for vein care.