Samsung Electronics Co., Ltd.

Jong-ho Rhee

Yong-kuk You

Sang-heun Oh

Hee-jae Park

A method of authenticating a password and a portable device thereof are provided. The method includes: displaying an input keyboard on which a plurality of objects are arranged; changing an object arranged on the input keyboard according to a manipulation of a user; and if an object pattern arranged in a designated position of the input keyboard corresponds to a preset password pattern, authenticating the user. Therefore, it is difficult to use artifacts on the display screen to trace a password after entry, and thus security is improved. As a result, a protection of personal information of a user is strengthened.

Method of authenticating password and portable device thereof

The method of decrypting a ciphertext includes: pre-storing a plurality of polynomial functions into which a secret key decrypting a ciphertext to a plaintext according to a public-key cryptography algorithm is broken down; receiving the ciphertext generated based on the secret key which is broken down into the plurality of polynomial functions from a ciphertext generating device; and decrypting the received ciphertext into the plaintext based on the pre-stored polynomial functions.

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Seoul, South Korea

Jong-ho Rhee