Portsmouth, N.H.-based certificate authority (CA) GlobalSign plans to be back fully operating on Monday after temporarily suspending the issuance of SSL credentials due to claims from a hacker linked to attacks on Comodo and DigiNotar. In a Monday post to Pastebin, a hacker claimed responsibility for the major attack on DigiNotar and said he has access to four other CAs, including GlobalSign. “We are adopting a high-threat approach to bringing services back online and we are working with a number of organizations to audit the process,” the company said in a news release. GlobalSign is still investigating the hacker’s claims, but said it believes CAs are facing an “industry-wide” attack.