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Though hackers did obtain "strongly encrypted PIN data" when they got into Target's information systems, the retailer said Friday that sensitive information from customers' debit cards should not be at risk.

Target posted this explanation:

"When a guest uses a debit card in our stores and enters a PIN, the PIN is encrypted at the keypad with what is known as Triple DES. Triple DES encryption is a highly secure encryption standard used broadly throughout the U.S.

"Target does not have access to nor does it store the encryption key within our system. The PIN information is encrypted within Target's systems and can only be decrypted when it is received by our external, independent payment processor. What this means is that the 'key' necessary to decrypt that data has never existed within Target's system and could not have been taken during this incident."

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A ship that has been trapped in thick Antarctic ice since Christmas Eve was nearing rescue on Friday, after a Chinese icebreaker named the Snow Dragon drew close to the icebound vessel.

The Russian ship MV Akademik Shokalskiy, which has been on a research expedition to Antarctica, got stuck Tuesday after a blizzard's whipping winds pushed the sea ice around the ship, freezing it in place. The ship wasn't in danger of sinking, and there were ample supplies for the 74 scientists, tourists and crew on board, but the vessel couldn't move.

Maritime authorities received the ship's distress signal on Wednesday and sent three icebreakers to assist. By Friday afternoon, China's Snow Dragon had made it as far as the edge of the sea ice surrounding the ship, 12 miles away, but still faced the tough task of getting through the dense pack ice to the paralyzed vessel.

The Snow Dragon was hoping to reach the ship by Friday evening, but changing weather conditions and the thickness of the ice could slow its progress, said Andrea Hayward-Maher, spokeswoman for the Australian Maritime Safety Authority, which is coordinating the rescue.

Expedition leader Chris Turney said it may take the Snow Dragon until Saturday to break through.

"We're all just on tenterhooks at the moment, waiting to find out" how long it will take, Turney said by satellite phone. "Morale is really good."

The scientific team on board the vessel — which left New Zealand on Nov. 28 — had been recreating Australian explorer Douglas Mawson's century-old voyage to Antarctica when it became trapped. They plan to continue their expedition after they are freed, Turney said.

Passengers and crew have had to contend with blizzard conditions, including winds up to 40 miles per hour, but the weather had calmed considerably by Friday, Turney said.

"The blizzard we had yesterday was quite extraordinary — it's not nice when you can feel the ship shaking," he said.

Despite the interruption to the expedition, the scientists have continued their research while stuck, counting birds in the area and drilling through the ice surrounding the ship to photograph sea life.

McDonald's has decided to shut down a website aimed at providing work and life advice to its employees after it was reported that it had urged workers not to eat the very fast food they are hired to produce.

The Oak Brook, Ill.-based McDonald's said Thursday that information on its McResource Line site had been taken out of context thus generating "unwarranted scrutiny and inappropriate commentary," according to a McDonald's spokeswoman.

On Monday, CNBC reported that McDonald's had posted on the site an illustration of two meals — one that looked suspiciously like the company's own double cheeseburger offering, complete with soft drink and fries, that was labeled "Unhealthy choice." Next to it was another illustration showing a submarine sandwich, salad and a glass of water, labeled "Healthier choice."

The accompanying text read:

"Although not impossible it is more of a challenge to eat healthy when going to a fast food place. In general, avoiding items that are deep fried are your best bet."