California-based online information storage firm Evernote has asked all users to reset their passwords, following a security breach by hackers.

Evernote on Saturday said that it has discovered and blocked suspicious activity on the Evernote network that appears to have been a coordinated attempt to access secure areas of the Evernote Service.

As a precaution to protect your data,the company has decided to implement a password reset.

Evernote said is had found no evidence that any of the content you store in Evernote was accessed, changed or lost. The company has also no evidence that any payment information for Evernote Premium or Evernote Business customers was accessed.

The investigation has shown, however, that the individual(s) responsible were able to gain access to Evernote user information, which includes usernames, email addresses associated with Evernote accounts and encrypted passwords. Even though this information was accessed, the passwords stored by Evernote are protected by one-way encryption. (In technical terms, they are hashed and salted.)

Despite the robust encryption measures, Evernote is requiring all users to reset their Evernote account passwords. Users can create a new password by signing into your account on evernote.com.

After signing in, they will be prompted to enter their new password. Once they have reset their password on evernote.com, users will need to enter their new password in other Evernote apps that they use.

The firm apologised "for the annoyance" caused by the breach.

In February, Apple revealed a some of its computers had been hacked, but added there was no sign of data theft.

The hack came a week after social-networking firm Facebook said it had traced a cyber-attack back to China after some of its employee laptops were hacked.

A month ago, Twitter also announced it had been the victim of a security breach which compromised the accounts of 250,000 users.