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We, the Editor and Publisher of the  International Journal of Computers and Applications , have retracted the following article which was part of the Special Issue on Advanced Security Techniques for Cloud Computing and Big Data - New Directions:Yongqiang He &amp; Xuyang Zhang (2020) Key technologies of massive concurrent data processing in smart city based on cloud computing,  International Journal of Computers and Applications , DOI:  10.1080/1206212X.2020.1743040Since publication, it came to our attention that the articles published in this Special Issue were not reviewed fully in line with the journal's peer review standards and policy. We did not find any evidence of misconduct by the authors. However, in order to ensure full assessment has been conducted, we sought expert advice on the validity and quality of the published articles from independent peer reviewers. Following this post publication peer review, the Editor has determined that the articles do not meet the required scholarly standards to remain published in the journal, and therefore has taken the decision to retract. The concerns raised have been shared with the authors and they have been given the opportunity to respond. The authors have been informed about the retraction of the article. Yongqiang He &amp; Xuyang Zhang (2020) Key technologies of massive concurrent data processing in smart city based on cloud computing,  International Journal of Computers and Applications , DOI:  10.1080/1206212X.2020.1743040 We have been informed in our decision-making by our policy on publishing ethics and integrity and the COPE guidelines on retractions. The retracted articles will remain online to maintain the scholarly record, but they will be digitally watermarked on each page as ‘Retracted’.

Retracted Article: Key technologies of massive concurrent data processing in smart city based on cloud computing